BCU ERROR CODES

John Deere BCU fault codes / John Deere BCU diagnostic trouble codes

BCU – Electronic Hitch Control

BCU 000084.02 ( BCU 84.02 )— B09/B35 Wheel Speed Sensor, out of Valid Range
The diagnostic trouble code is generated when the control unit detects an open circuit or an invalid sensor signal.

BCU 000096.03 ( BCU 96.03 )— B176 Fuel Level Sensor, Voltage Too High
The diagnostic trouble code is generated when the control unit detects an open circuit or a short to 12 Volts.

BCU 000096.04 ( BCU 96.04 )— B176 Fuel Level Sensor, Voltage Too Low
The diagnostic trouble code is generated when the control unit detects a short to ground.

BCU 000096.17 ( BCU 96.17 )— Fuel Level Too Low
This diagnostic trouble code is generated when the fuel level is too low.

BCU 000115.31 ( BCU 115.31 )— G02 Alternator, Malfunction
The diagnostic trouble code is generated when the BCU control unit detects an open alternator preexcitation circuit.

BCU 000168.03 ( BCU 168.03 )— Control Unit, Supply Voltage Too High
The diagnostic trouble code is generated when the control unit registers a supply voltage above 16 volts.

BCU 000168.04 ( BCU 168.04 )— Control Unit, Supply Voltage Too Low
The diagnostic trouble code is generated when the control unit registers a supply voltage of less than 12 volts.

BCU 000168.16 ( BCU 168.16 )— Control Unit, Supply Voltage Too High
The diagnostic trouble code is generated when the control unit registers a supply voltage above 16 volts.

BCU 000168.17 ( BCU 168.17 )— Control Unit, Supply Voltage Too Low (Engine Speed Above 1500 rpm)
The diagnostic trouble code is generated when the control unit registers a supply voltage of less than 12.5 volts with an engine speed above 1500 rpm.

BCU 000168.18 ( BCU 168.18 )— Control Unit, Supply Voltage Too Low (Engine Speed Above 500 rpm)
The diagnostic trouble code is generated when the control unit registers a supply voltage of less than 11.2 volts with an engine speed above 500 rpm.

BCU 000177.18 ( BCU 177.18 )— Transmission Oil Temperature Too Low During Calibration
The diagnostic trouble code is generated when an oil temperature below 40° C (104° F) is registered while the hitch control is being calibrated. A low oil temperature may adversely affect the calibration process. Heat hydraulic oil and repeat the calibration (see “BCU Calibration and Input Addresses of Hitch Control” in Section 245, Group BCU).

BCU 000186.02 ( BCU 186.02 )— B06 Sensor for Rear PTO Speed, Open Circuit
The diagnostic trouble code is generated when the BCU control unit detects an open rear PTO speed sensor circuit during the sensor circuit check.

BCU 000186.15 ( BCU 186.15 )— B06 Rear PTO Speed Sensor, Speed Present Despite Rear PTO Being Switched Off
The diagnostic trouble code is generated when the BCU control unit detects rear PTO speed although the rear PTO switch is off. The diagnostic trouble code can also be triggered, when an implement is coasting down after the rear PTO has been shut off.

BCU 000186.17 ( BCU 186.17 )— B06 Rear PTO Speed Sensor, Speed Not Present
The diagnostic trouble code is generated when the BCU control unit detects that the rear PTO is switched on, but no speed is transmitted by the rear PTO speed sensor (B06). The diagnostic trouble code also appears, when the rear PTO is switched on, but no PTO speed has been selected.

BCU 000190.02 ( BCU 190.02 )— B72 Crankshaft Speed Sensor, Open Circuit
This diagnostic trouble code is triggered if the control unit recognizes an open circuit when a nonexistent function is activated in address BCU030. Check the input address.

BCU 000237.02 ( BCU 237.02 )— VIN Information, Mismatch
The diagnostic trouble code is generated when the Vehicle Identification Number (VIN) from other control units is not the same.

BCU 000237.14 ( BCU 237.14 )— VIN Information, System Deactivated
The diagnostic trouble code is generated when the VIN security function was not enabled due to an internal problem. This indicates an incorrect reprogramming of the control unit.

BCU 000237.31 ( BCU 237.31 )— VIN Information, Incorrect
The diagnostic trouble code is generated when the vehicle identification number from other control units is not received or incorrectly received.

BCU 000629.12 ( BCU 629.12 )— Control Unit Internal Fault
The diagnostic trouble code is generated when the control unit internally detects that too much time has elapsed (watchdog).

BCU 000639.12 ( BCU 639.12 )— Vehicle CAN BUS, High Error Rate
The diagnostic trouble code is generated when the control unit receives too many incorrect CAN BUS messages or when it detects a general problem in the connection to the vehicle CAN BUS.

BCU 000639.14 ( BCU 639.14 )— Vehicle CAN BUS, Very High Error Rate
The diagnostic trouble code is generated when the control unit receives too many incorrect CAN BUS messages or when it detects a general problem in the connection to the vehicle CAN BUS.

BCU 000746.31 ( BCU 746.31 )— Y05 Differential Lock Solenoid Valve, Fault
The diagnostic trouble code is generated when the BCU control unit detects an open circuit to the differential lock solenoid valve.

BCU 000980.07 ( BCU 980.07 )— S21 Rear PTO Switch, Fault
The diagnostic trouble code is generated when the BCU control unit detects an unrealistic value from the rear PTO switch.

BCU 001058.18 ( BCU 1058.18 )— INFORMATION FOR OPERATOR: Pressure Switch for AirBrake System Is Not Activated (Pressure Too Low)
This information for the operator (diagnostic trouble code) is triggered if an incorrect entry is made at address BCU065.

BCU 001079.03 ( BCU 1079.03 )— B41 Draft Sensor, Voltage Too High
The diagnostic trouble code is generated when the BCU control unit detects that the voltage at the signal input of the draft sensor is too high (above 4.75 V). This indicates a malfunction in the draft sensor circuit.

BCU 001079.04 ( BCU 1079.04 )— B41 Draft Sensor, Voltage Too Low
The diagnostic trouble code is generated when the BCU control unit detects that the voltage at the signal input of the draft sensor is too low (below 0.25 V). This indicates a malfunction in the draft sensor circuit.

BCU 001504.14 ( BCU 1504.14 )— INFORMATION FOR OPERATOR: Operator Presence Switch Not Activated While HMS Plus is Selected
This operator information (diagnostic trouble code) is generated when the HMS Plus function has been activated and there is no valid operator presence signal for more than 30 seconds.

BCU 001873.03 ( BCU 1873.03 )— B21 Hitch Position Sensor, Voltage Too High
The diagnostic trouble code is generated when the control unit detects a voltage above 4.75 volts at the hitch position sensor input.

BCU 001873.04 ( BCU 1873.04 )— B21 Hitch Position Sensor, Voltage Too Low
The diagnostic trouble code is generated when the control unit detects a voltage below 0.25 volts at the hitch position sensor input.

BCU 001873.15 ( BCU 1873.15 )— B21 Hitch Position Sensor, Voltage Too High During Calibration
The diagnostic trouble code is generated when the control unit detects excessive voltage during the hitch calibration.

BCU 001873.17 ( BCU 1873.17 )— B21 Hitch Position Sensor, Voltage Too Low During Calibration
The diagnostic trouble code is generated when the control unit detects low voltage during the hitch calibration.

BCU 001882.02 ( BCU 1882.02 )— B58 Sensor for Front PTO Speed, Open Circuit
This diagnostic trouble code can only be triggered if the front PTO is activated in address BCU027, or if a front PTO speed sensor is activated at address BCU030

BCU 001882.15 ( BCU 1882.15 )— B58 Front PTO Speed Sensor, Speed Present Despite Front PTO Being Switched Off
This diagnostic trouble code can only be triggered if the front PTO is activated in address BCU027, or if a front PTO speed sensor is activated at address BCU030.

BCU 001882.17 ( BCU 1882.17 )— B58 Front PTO Speed Sensor, Speed Not Present
This diagnostic trouble code can only be triggered if the front PTO is activated in address BCU027, or if a front PTO speed sensor is activated at address BCU030.

BCU 001883.31 ( BCU 1883.31 )— Rear PTO Speed Too High
This diagnostic trouble code is generated when the BCU control unit receives a rear PTO speed that is too high. If the diagnostic trouble code is generated although it is certain that the rear PTO speed is not too high: Perform “B06 Rear PTO Speed Sensor, Operational Check” in Section 245, Group BCU.

BCU 001890.03 ( BCU 1890.03 )— B179 PTO Shaft Spline Identifier Switch, Supply Voltage Too High
The diagnostic trouble code is generated when more than 16 volts are measured at the positive power supply lead for the PTO shaft spline identifier switch B179. This indicates a defective battery or a defective generator.

BCU 001890.04 ( BCU 1890.04 )— B179 PTO Shaft Spline Identifier Switch, Supply Voltage Too Low
The diagnostic trouble code is generated when less than 9 volts are measured at the positive power supply lead for the PTO shaft spline identifier switch B179. This indicates a short to ground.

BCU 001890.31 ( BCU 1890.31 )— B179 PTO Shaft Spline Identifier Switch, Fault
The diagnostic trouble code is generated when the BCU control, with switchedon rear PTO unit, detects a change in the rear PTO spline.

BCU 001893.07 ( BCU 1893.07 )— S06 Front PTO Switch, Fault
This diagnostic trouble code can only be triggered if the front PTO is activated in address BCU027.

BCU 001894.13 ( BCU 1894.13 )— Proportional Solenoid Valve for Rear PTO Not Calibrated
This diagnostic trouble code is generated each time the BCU control unit is programmed. When calibration of the rear PTO has been completed, the diagnostic trouble code can be deleted at BCU 033.

BCU 001894.31 ( BCU 1894.31 )— INFORMATION FOR OPERATOR: Rear PTO Switch was On When Engine was Started
This operator information (diagnostic trouble code) is generated when the rear PTO is switched on when starting the engine or turning on the ignition. If the diagnostic trouble code is generated although the rear PTO was not on while starting the engine: Perform “S21 Rear PTO Switch, Operational Check” in Section 245, Group BCU.

BCU 001896.14 ( BCU 1896.14 )— INFORMATION FOR OPERATOR: Rear PTO Switch On Although Preselection of Rear PTO Speed Was in Neutral
This operator information (diagnostic trouble code) is generated when the rear PTO is switched on although preselection of rear PTO speed is in neutral.

BCU 001896.31 ( BCU 1896.31 )— INFORMATION FOR OPERATOR: Do Not Change Preselection of Rear PTO Speed Repeatedly
This operator information (diagnostic trouble code) is generated when the preselection of rear PTO speed is changed repeatedly.

BCU 002000.09 ( BCU 2000.09 )— Incorrect CAN BUS Message, Information from ECU
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and ECU. Reception of one, several or all of the CAN messages transmitted by the ECU is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002003.09 ( BCU 2003.09 )— Incorrect CAN BUS Message, Information from EPC/TCU
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and EPC or TCU. Reception of one, several or all of the CAN messages transmitted by the EPC or TCU is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002005.09 ( BCU 2005.09 )— Incorrect CAN BUS Message, Information from UIC
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and UIC. Reception of one, several or all of the CAN messages transmitted by the UIC is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002023.09 ( BCU 2023.09 )— Incorrect CAN BUS Message, Information from BIF
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and BIF. Reception of one, several or all of the CAN messages transmitted by the BIF is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002040.09 ( BCU 2040.09 )— Incorrect CAN BUS Message, Information from DTI
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and DTI. Reception of one, several or all of the CAN messages transmitted by the DTI is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002155.09 ( BCU 2155.09 )— Incorrect CAN BUS Message, Information from Power Module PC5 (Transmission)
This diagnostic trouble code is triggered if there is a problem transferring data between the BCU control unit and power module PC5 (transmission). Reception of one, several or all of the CAN messages transmitted by power module PC5 (transmission) is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002221.09 ( BCU 2221.09 )— Incorrect CAN BUS Message, Information from PLC
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and PLC. Reception of one, several or all of the CAN messages transmitted by the PLC is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002240.09 ( BCU 2240.09 )— Incorrect CAN BUS Message, Information from TEC
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and TEC. Reception of one, several or all of the CAN messages transmitted by the TEC is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002246.09 ( BCU 2246.09 )— Incorrect CAN BUS Message, Information from DSM
This diagnostic trouble code is generated when a data transfer problem occurs between the BCU and DSM. Reception of one, several or all of the CAN messages transmitted by the DSM is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002354.00 ( BCU 2354.00 )— E09 Front Corner Worklights, Current Overload Protection Active at Power Module (HF) PC6
This diagnostic trouble code is triggered if power module (HF) PC6 measures a total amperage in excess of 40 amps at the E3 and H1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output E3: E09 Front Corner Worklights (right and left), diagnostic trouble code BCU 002354.00.
• Output H1: E15 RearFacing Worklights on Rear Fenders, diagnostic trouble code BCU 002360.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 002354.01 ( BCU 2354.01 )— E09 Front Corner Worklights, Power Supply Fault at Power Module (HF) PC6
This diagnostic trouble code is generated if, when front corner worklights are switched on, power module (HF) PC6 measures less than 3 volts at the supply voltage for the front corner worklight output (lead 0222).

BCU 002354.04 ( BCU 2354.04 )— E09 Front Corner Worklights On, Current Too High at Power Module (HF) PC6
This diagnostic trouble code is triggered if, when front corner worklights are switched on, power module (HF) PC6 measures in excess of 15 amps in lead 1011. This indicates a short to ground in the circuit.

BCU 002354.05 (BCU 2354.05)— E09 Front Corner Worklights On, No Current Present at Power Module (HF) PC6
This diagnostic trouble code is triggered if, when front corner worklights are switched on, power module (HF) PC6 measures a current of less than 500 mA at the front corner worklight output (E09) (lead 1011). This indicates that the circuit is open.

BCU 002354.09 ( BCU 2354.09 )— E09 Front Corner Worklights, Incorrect CAN BUS Message from BCU (Power Module (HF) PC6)
This diagnostic trouble code is generated if there is a problem transferring data between power module (HF) PC6 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module (HF) PC6 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002354.12 ( BCU 2354.12 )— E09 Front Corner Worklights Off, Current Present at Power Module (HF) PC6
This diagnostic trouble code is triggered if, with front corner worklights switched off, power module (HF) PC6 measures a current of more than 1 A at the front corner worklight output (E09) (lead 1011). This indicates a short in the circuit or an internal fault in the power module.

BCU 002354.19 ( BCU 2354.19 )— E09 Front Corner Worklights, Incorrect CAN BUS Message (Power Module (HF) PC6)
This diagnostic trouble code is triggered if the output for switching the front corner worklights (E09) is energized by more than one control unit.

BCU 002360.00 ( BCU 2360.00 )— E15 RearFacing Worklights on Rear Fenders, Current Overload Protection Active at Power Module (HF) PC6
This diagnostic trouble code is triggered if power module (HF) PC6 measures a total amperage in excess of 40 amps at the E3 and H1 outputs. The following functions are monitored together and may trigger additional diagnostic
trouble codes that affect the current overload protection:
• Output E3: E09 Front Corner Worklights (right and left), diagnostic trouble code BCU 002354.00.
• Output H1: E15 RearFacing Worklights on Rear Fenders, diagnostic trouble code BCU 002360.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 002360.01 ( BCU 2360.01 )— E15 RearFacing Worklights on Rear Fenders, Power Supply Fault at Power Module (HF) PC6
This diagnostic trouble code is generated if, when rearfacing worklights on rear fenders are switched on, power module (HF) PC6 measures less than 3 volts at the supply voltage for the rearfacing worklights on rear fenders output (lead 0222).

BCU 002360.04 ( BCU 2360.04 )— E15 RearFacing Worklights on Rear Fenders On, Current Too High at Power Module PC6
This diagnostic trouble code is triggered if, when rearfacing worklights on rear fenders are switched on, power module (HF) PC6 measures in excess of 15 amps in lead 1033. This indicates a short to ground in the circuit.

BCU 002360.05 ( BCU 2360.05 )— E15 RearFacing Worklights on Fenders On, No Current Present at Power Module PC6
This diagnostic trouble code is triggered if, when rearfacing worklights on rear fenders are switched on, power module (HF) PC6 measures a current of less than 500 mA at the rearfacing worklights on rear fenders (E15) output (lead 1033). This indicates that the circuit is open.

BCU 002360.09 ( BCU 2360.09 )— E15 RearFacing Worklights on Fenders, Incorrect CAN BUS Message from BCU (Power Module (HF) PC6)
This diagnostic trouble code is generated if there is a problem transferring data between power module (HF) PC6 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module (HF) PC6 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002360.12 ( BCU 2360.12 )— E15 RearFacing Worklights on Rear Fenders Off, Current Present at Power Module (HF) PC6
This diagnostic trouble code is triggered if, with rearfacing worklight on rear fender off, power module (HF) PC6 measures a current of more than 1 A at the rearfacing worklight on rear fender output (E15) (lead 1033). This indicates a short in the circuit or an internal fault in the power module.

BCU 002360.19 ( BCU 2360.19 )— E15 RearFacing Worklights on Fenders, Incorrect CAN BUS Message (Power Module (HF) PC6)
This diagnostic trouble code is triggered if the output for switching the rearfacing worklights on rear fenders (E15) is energized by more than one control unit.

BCU 002386.00 ( BCU 2386.00 )— E27 Beacon Light, Current Overload Protection Active at Power Module (HF) PC6
This diagnostic trouble code is triggered if power module (HF) PC6 measures a total amperage in excess of 40 amps at the A1, C1 and D1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output A1: M02 Compressor clutch, diagnostic trouble code ATC 000876.00.
• Output C1: E27 beacon light, diagnostic trouble code BCU 002386. 00.
• Output D1: E20/R and E20/L worklights on cab frame (right and left), diagnostic trouble code BCU 523691.00.
• Output D1: E36R and E36L xenon (HID) worklights on cab frame (right and left), diagnostic trouble code BCU 523691.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 002386.01 ( BCU 2386.01 )— E27 Beacon Light, Power Supply Fault at Power Module PC6
This diagnostic trouble code is generated if, when the beacon light is switched on, power module (HF) PC6 measures less than 3 volts at the supply voltage for the beacon light output (lead 0732).

BCU 002386.04 ( BCU 002386.04 )— E27 Beacon Light On, Current Too High at Power Module PC6
This diagnostic trouble code is triggered if, when beacon light is switched on, power module (HF) PC6 measures in excess of 15 amps in lead 1004. This indicates a short to ground in the circuit.

BCU 002386.05 ( BCU 2386.05 )— E27 Beacon Light On, No Current Present at Power Module PC6
This diagnostic trouble code is generated if, when beacon light is switched on, power module (HF) PC6 measures less than 500 mA at the beacon light output (lead 1004). This indicates that the circuit is open.

BCU 002386.09 ( BCU 2386.09 )— E27 Beacon Light, Incorrect CAN BUS Message from BCU (Power Module (HF) PC6)
This diagnostic trouble code is generated if there is a problem transferring data between power module (HF) PC6 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module (HF) PC6 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 002386.12 ( BCU 2386.12 )— E27 Beacon Light Off, Current Present at Power Module (HF) PC6
This diagnostic trouble code is triggered if, with beacon light switched off, power module (HF) PC6 measures in excess of 1 amp at the beacon light (E27) output (lead 1004). This indicates a short in the circuit or an internal fault in the power module.

BCU 002386.19 ( BCU 2386.19 )— E27 Beacon Light, Incorrect CAN BUS Message (Power Module (HF) PC6)
This diagnostic trouble code is triggered if the output for switching the beacon light (E27) is energized by more than one control unit.

BCU 002392.31 ( BCU 2392.31 )— H67 Backup Alarm, Malfunction
The diagnostic trouble code is generated when the control unit detects a malfunction at the output to backup alarm (lead 2077) after the reverse drive lever has been moved to reverse position. This indicates that the circuit is open.

BCU 002818.31 ( BCU 2818.31 )— INFORMATION FOR OPERATOR: Operator Presence Switch Not Activated
This operator information (diagnostic trouble code) is generated when functions are selected which require the operator presence switch to be activated but the operator has left the seat. If the diagnostic trouble code is generated though the operator is seated: Perform “S40 Operator Presence Switch, Operational Check”, Section 245, Group BCU.

BCU 002876.07 ( BCU 2876.07 )— S127 MultiFunction Lever, Fault (Turn Signal)
The diagnostic trouble code is generated when the BCU control unit detects an unrealistic value from the multifunction lever (turn signal).

BCU 002876.07 ( BCU 2876.07 )— S127 MultiFunction Lever, Fault (Turn Signal)
The diagnostic trouble code is generated when the BCU control unit detects an unrealistic value from the multifunction lever (turn signal).

BCU 303053.03 — B26 Sensitivity Potentiometer, Signal Voltage Too High
Diagnostic trouble code BCU 303053.03 is generated when the BCU measures a voltage over 4.75 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303053.04 — B26 Sensitivity Potentiometer, Signal Voltage Too Low
Diagnostic trouble code BCU 303053.04 is generated when the BCU measures a voltage below 0.25 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303054.03 — B27 / B98 HitchHeight Control Potentiometer, Signal Voltage Too High
Diagnostic trouble code BCU 303054.03 is generated when the BCU measures a voltage over 4.75 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303054.04 — B27 / B98 HitchHeight Control Potentiometer, Signal Voltage Too Low
Diagnostic trouble code BCU 303054.04 is generated if the BCU measures a voltage below 0.25 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303056.03 — B27 RaiseLimit Potentiometer, Signal Voltage Too High
Diagnostic trouble code BCU 303056.03 is generated when the BCU measures a voltage over 4.75 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303056.04 — B27 RaiseLimit Potentiometer, Signal Voltage Too Low
Diagnostic trouble code BCU 303056.04 is generated when the BCU measures a voltage below 0.25 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303057.03 — B27 RateofDrop Potentiometer, Signal Voltage Too High
Diagnostic trouble code BCU 303057.03 is generated when the BCU measures a voltage over 4.75 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 303057.04 — B27 RateofDrop Potentiometer, Signal Voltage Too Low
Diagnostic trouble code BCU 303057.04 is generated when the BCU measures a voltage below 0.25 V at the signal input of the potentiometer while the hitch control is being calibrated.

BCU 522451.03 — NonExistent Function
Activated This diagnostic trouble code is generated if the control unit recognizes an open circuit when a nonexistent function is activated in address BCU071.

BCU 522451.04 — NonExistent Function
Activated This diagnostic trouble code is generated if the control unit recognizes an open circuit when a nonexistent function is activated in address BCU071.

BCU 522451.14 — NonExistent Function
Activated This diagnostic trouble code is generated if the control unit recognizes an open circuit when a nonexistent function is activated in address BCU071.

BCU 522507.31 — Control Unit Not Calibrated
The diagnostic trouble code is generated if the BCU has not been calibrated yet, is incorrectly calibrated or if calibration has not been completed. It is also possible that this diagnostic trouble code is generated by mistake during hitch calibration. It is not necessary to perform the calibration procedure again unless this diagnostic trouble code cannot be deleted. The diagnostic trouble code triggers the alarm level “Information”.

BCU 523438.02 — Control Unit Internal Fault
If a fault occurs when the internal module (EEPROM) intervenes, this diagnostic trouble code is generated.

BCU 523652.02 — Controller Connected to Wrong Wiring Harness Connector
The diagnostic trouble code is generated when the control unit detects an erroneous signal in the circuit of the control unit identification during initializing (control unit boot sequence after the ignition is switched ON).

BCU 523689.31 — S22 Differential Lock Switch, Fault
The diagnostic trouble code is generated when the BCU detects an engage signal from differential lock switch for more than 15 seconds.

BCU 523690.02 — S23/S68 Switches for Remote Control of Rockshaft (Right/Left), Fault
The diagnostic trouble code is generated when the BCU control unit detects an unrealistic value from the switch for remote control of rockshaft (right/left).

BCU 523691.00 — Lower Worklights on Cab Frame, Current Overload Protection Active at Power Module (HF) PC6
This diagnostic trouble code is triggered if power module (HF) PC6 measures a total amperage in excess of 40 amps at the A1, C1 and D1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output A1: M02 Compressor clutch, diagnostic trouble code ATC 000876.00.
• Output C1: E27 beacon light, diagnostic trouble code BCU 002386. 00.
• Output D1: E20/R and E20/L worklights on cab frame (right and left), diagnostic trouble code BCU 523691.00.
• Output D1: E36R and E36L xenon (HID) worklights on cab frame (right and left), diagnostic trouble code BCU 523691.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523691.01 — Lower Worklights on Cab Frame, Incorrect Supply Voltage at Power Module (HF) PC6
This diagnostic trouble code is generated if, when worklights on cab frame (E20 or E36) are switched on, power module (HF) PC6 measures less than 3 volts at the supply voltage for the worklights on cab frame (E20 or E36) output (lead 0732).

BCU 523691.04 — Lower Worklights on Cab Frame On, Current Too High at Power Module (HF) PC6
This diagnostic trouble code is triggered if, when worklights on cab frame (E20 or E36) are switched on, power module (HF) PC6 measures in excess of 15 amps in lead 1034. This indicates a short to ground in the circuit.

BCU 523691.05 — Lower Worklights on Cab Frame On, No Current Present at Power Module (HF) PC6
This diagnostic trouble code is triggered if, when lower worklights on cab frame are switched on, power module (HF) PC6 measures a current of less than 500 mA at the lower worklights on cab frame output (E20 or E36) (lead 1034). This indicates that the circuit is open.

BCU 523691.09 — Lower Worklights on Cab Frame, Incorrect CAN BUS Message from BCU (Power Module (HF) PC6)
This diagnostic trouble code is generated if there is a problem transferring data between power module (HF) PC6 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module (HF) PC6 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523691.12 — Lower Worklights on Cab Frame Off, Current Present at Power Module (HF) PC6
The diagnostic trouble code is generated if, with lower worklights on cab frame (E20/R and E20/L) or the xenon (HID) worklights on cab frame (E36/R and E36/L) switched off, power module (HF) PC6 measures in excess of 1 amp at the output to the lower worklights on cab frame (E20/R and E20/L) or the xenon (HID) worklights on cab frame (E36/R and E36/L) (lead 1034). This indicates a short in the circuit or an internal fault in the power module.

BCU 523691.19 — Lower Worklights on Cab Frame, Incorrect CAN BUS Message (Power Module (HF) PC6)
The diagnostic trouble code is triggered if the output for switching the lower worklights on cab frame (E20/R and E20/L) or the xenon (HID) worklights on cab frame (E36/R and E36/L) is energized by more than one control unit.

BCU 523692.00 — Upper Worklights on Cab Frame, Current Overload Protection Active at Power Module PC0
This diagnostic trouble code is triggered if power module PC0 measures a total amperage in excess of 40 amps at the A3 and D1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output A3: E08 Right Light on Cab Frame (Dipped Beam), Diagnostic Trouble Code BIF 523909.00
• Output D1: E35L/R Worklights on Cab Frame, Diagnostic Trouble Code BCU 523692.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523692.01 — Upper Worklights on Cab Frame, Power Supply Fault at Power Module PC0
This diagnostic trouble code is generated if, when the upper worklights on cab frame are switched on, power module PC0 measures less than 3 volts at the supply voltage for the output of the upper worklights on cab frame (lead 0792).

BCU 523692.04 — Upper Worklights on Cab Frame On, Current Too High at Power Module PC0
This diagnostic trouble code is triggered if, when upper worklights on cab frame are switched on, power module PC0 measures in excess of 15 amps in lead 1029. This indicates a short to ground in the circuit.

BCU 523692.05 — Upper Worklights on Cab Frame On, No Current Present at Power Module PC0
This diagnostic trouble code is triggered if, when upper worklights on cab frame are switched on, power module PC0 measures a current of less than 500 mA at the upper worklights on cab frame output (E35) (lead 1029). This indicates that the circuit is open.

BCU 523692.09 — Upper Worklights on Cab Frame, Incorrect CAN BUS Message from BCU (Power Module PC0)
This diagnostic trouble code is generated if there is a problem transferring data between power module PC0 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC0 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523692.12 — Upper Worklights on Cab Frame Off, Current Present at Power Module PC0
This diagnostic trouble code is triggered if, with upper worklights on cab frame switched off, power module (HF) PC0 measures a current of more than 1 A at the output to worklights on cab frame (lead 1029). This indicates a short in the circuit or an internal fault in the power module.

BCU 523692.19 — Upper Worklights on Cab Frame, Incorrect CAN BUS Message (Power Module PC0)
This diagnostic trouble code is triggered if the output for switching the upper worklights on cab frame is energized by more than one control unit.

BCU 523701.05 — M08 Stepper Motor for Hitch (Coil 2), Open Circuit
The diagnostic trouble code is generated when the BCU detects that the voltage at the output to stepper motor for hitch (coil 2) in leads 7054 and 7055 is too high. This indicates that the circuit is open.

BCU 523701.06 — M08 Stepper Motor for Hitch (Coil 2), Current Too High
The diagnostic trouble code is generated when the BCU detects that the current at the output to stepper motor for hitch (coil 2) in leads 7054 and 7055 is too high. This indicates a short to ground in the circuit.

BCU 523702.14 — VIN Information, System DeActivated
The diagnostic trouble code is generated when the VIN security function was not enabled due to an internal problem. This indicates an incorrect reprogramming of the control unit.

BCU 523702.31 — VIN Information, Incorrect
The diagnostic trouble code is generated when the vehicle identification number from the BCU control unit is not received or incorrectly received.

BCU 523703.02 — B19 Right Draft Sensor, Distorted Signal During Calibration
This diagnostic trouble code is generated if the basic control unit (BCU) registers a varying voltage (more than 0.5 volts) at the signal input of the right draft sensor. This indicates a malfunction in the draft sensor circuit.

BCU 523703.03 — B19 Right Draft Sensor, Voltage Too High During Calibration
This diagnostic trouble code is generated if the basic control unit (BCU) detects that the voltage at the signal input of the right draft sensor is too high (above 4,75 V). This indicates a malfunction in the draft sensor circuit.

BCU 523703.04 — B19 Right Draft Sensor, Voltage Too Low During Calibration
This diagnostic trouble code is generated if the basic control unit (BCU) detects that the voltage at the signal input of the right draft sensor is too low (below 0.25 V). This indicates a malfunction in the draft sensor circuit.

BCU 523703.15 — B19 Right Draft Sensor, Voltage Too High
The diagnostic trouble code is generated when the BCU control unit detects that the voltage at the signal input of the r.h. draft sensor is too high (above 4.75 V). This indicates a malfunction in the draft sensor circuit.

BCU 523703.17 — B19 Right Draft Sensor, Voltage Too Low
The diagnostic trouble code is generated when the BCU control unit detects that the voltage at the signal input of the r.h. draft sensor is too low (below 0.25 V). This indicates a malfunction in the draft sensor circuit.

BCU 523704.02 — B20 Left Draft Sensor, Distorted Signal During Calibration
This diagnostic trouble code is generated if the basic control unit (BCU) registers a varying voltage (more than 0.5 volts) at the signal input of the left draft sensor. This indicates a malfunction in the draft sensor circuit.

BCU 523704.03 — B20 Left Draft Sensor, Voltage Too High During Calibration
This diagnostic trouble code is generated if the basic control unit (BCU) detects that the voltage at the signal input of the left draft sensor is too high (above 4.75 V). This indicates a malfunction in the draft sensor circuit.

BCU 523704.15 — B20 Left Draft Sensor, Voltage Too High
The diagnostic trouble code is generated when the BCU control unit detects that the voltage at the signal input of the l.h. draft sensor is too high (above 4.75 V). This indicates a malfunction in the draft sensor circuit.

BCU 523704.17 — B20 Left Draft Sensor, Voltage Too Low
The diagnostic trouble code is generated when the BCU control unit detects that the voltage at the signal input of the l.h. draft sensor is too low (below 0.25 V). This indicates a malfunction in the draft sensor circuit.

BCU 523714.31 — Y71 Solenoid Valve for
Draft Link Stabilizer, Fault The diagnostic trouble code is generated when the BCU control unit detects an open circuit to the draft link stabilizer solenoid valve.

BCU 523715.31 — Y72 Solenoid Valve for Draft Link Stabilizer, Fault
The diagnostic trouble code is generated when the BCU control unit detects an open circuit to the draft link stabilizer solenoid valve.

BCU 523745.31 — S100 HMS Plus Program Selector Switch, Fault
The diagnostic trouble code is generated when the BCU control unit detects an unrealistic value from the HMS Plus program selector switch.

BCU 523746.31 — Control Unit Internal Fault
The diagnostic trouble code is generated when the control unit (BCU) detects no current flow at the signal output for activating the tractor BUS system. This indicates that the circuit is shorted to a positive supply lead or there is an internal interruption at the control unit.

BCU 523749.31 — INFORMATION FOR OPERATOR: Rear PTO Not Operating. Switch Rear PTO Off and On Again
This operator information (diagnostic trouble code) is generated when the rear PTO speed is not in proportion to the engine speed.

BCU 523751.05 — M08 Stepper Motor for Hitch (Coil 1), Open Circuit
The diagnostic trouble code is generated when the BCU detects that the voltage at the output to stepper motor for hitch (coil 1) in leads 7058 and 7059 is too high. This indicates that the circuit is open.

BCU 523751.06 — M08 Stepper Motor for Hitch (Coil 1), Current Too High
The diagnostic trouble code is generated when the BCU detects that the current at the output to stepper motor for hitch (coil 1) in leads 7058 and 7059 is too high. This indicates a short to ground in the circuit.

BCU 523753.16 — M08 Stepper Motor for Hitch, Raising Deadband Too High During Calibration
This diagnostic trouble code is generated if the raising deadband of the stepper motor (play between the adjustment cam of the stepper motor and the raise valve of the hitch valve) detected during calibration is too large.

BCU 523753.18 — M08 Stepper Motor for Hitch, Raising Deadband Too Low During Calibration
This diagnostic trouble code is generated if the raising deadband of the stepper motor (play between the adjustment cam of the stepper motor and the raise valve of the hitch valve) detected during calibration is too low.

BCU 523756.16 — M08 Stepper Motor for Hitch, Lowering Deadband Too High During Calibration
This diagnostic trouble code is generated if the lowering deadband of the stepper motor (play between the adjustment cam of the stepper motor and the lower valve of the hitch valve) detected during calibration is too high.

BCU 523756.18 — M08 Stepper Motor for Hitch, Lowering Deadband Too Low During Calibration
This diagnostic trouble code is generated if the lowering deadband of the stepper motor (play between the adjustment cam of the stepper motor and the lower valve of the hitch valve) detected during calibration is too low.

BCU 523758.11 — S121 Remote Control Switch for Rear PTO (Right), Fault
The diagnostic trouble code is generated when the BCU detects an unrealistic value from the switch for remote control of rear PTO (right).

BCU 523759.11 — S44 Remote Control Switch for Rear PTO (Left), Fault
The diagnostic trouble code is generated when the BCU detects an unrealistic value from the switch for remote control of rear PTO (left).

BCU 523760.04 — Turn Signal/Hazard Flasher System, Supply Voltage Too Low
The diagnostic trouble code is generated when the BCU registers a supply voltage of less than 12 volts at the inputs for turn signal/hazard flasher system.

BCU 523760.31 — TurnSignal/Hazard Flasher System, Fault
The diagnostic trouble code is generated when the BCU detects an open circuit when the ignition is turned on.

BCU 523806.00 — Y75 Solenoid for PTO Speed 3, Current Overload Protection Active at Power Module PC5
This diagnostic trouble code is triggered if power module PC5 measures a total amperage in excess of 40 amps at the B3, C3 and D3 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output B3: Y75 Solenoid for PTO Speed 3, diagnostic trouble code BCU 523806.00.
• Output C3: Y73 Solenoid for PTO Speed 1, diagnostic trouble code BCU 523811.00.
• Output D3: Y74 Solenoid for PTO Speed 2, diagnostic trouble code BCU 523814.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523806.01 — Y75 Solenoid for PTO Speed 3, Power Supply Fault at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 3 is switched on, power module PC5 measures less than 3 volts at the supply voltage for the output of the solenoid for PTO speed 3 (lead 0232, fuse F02 PLB/02).

BCU 523806.04 — Y75 Solenoid for PTO Speed 3 On, Current Too High at Power Module PC5
This diagnostic trouble code is triggered if, when Y75 solenoid for PTO speed 3 is switched on, power module PC5 measures a current of more than 30 amps in lead 7115. This indicates a short to ground in the circuit.

BCU 523806.05 — Y75 Solenoid for PTO Speed 3 On, No Current Present at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 3 is switched on, power module PC5 measures a current of less than 500 mA at the output of Y75 solenoid for PTO speed 3 (lead 7115). This indicates that the circuit is open.

BCU 523806.09 — Y75 Solenoid for PTO Speed 3, Incorrect CAN BUS Message from BCU (Power Module PC5)
This diagnostic trouble code is triggered if there is a problem transferring data between power module PC5 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC5 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523806.12 — Y75 Solenoid for PTO Speed 3 Off, Current Present at Power Module PC5
This diagnostic trouble code is triggered if, with the solenoid for PTO speed 3 switched off, power module PC5 measures a current of more than 1 A at the output of Y75 solenoid for PTO speed 3 (lead 7115). This indicates a short in the circuit or an internal fault in the power module.

BCU 523806.19 — Y75 Solenoid for PTO Speed 3, Incorrect CAN BUS Message (Power Module PC5)
This diagnostic trouble code is triggered if the output for switching the solenoid for PTO speed 3 is energized by more than one control unit.

BCU 523811.00 — Y73 Solenoid for PTO Speed 1, Current Overload Protection Active at Power Module PC5
This diagnostic trouble code is triggered if power module PC5 measures a total amperage in excess of 40 amps at the B3, C3 and D3 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output B3: Y75 Solenoid for PTO Speed 3, diagnostic trouble code BCU 523806.00.
• Output C3: Y73 Solenoid for PTO Speed 1, diagnostic trouble code BCU 523811.00.
• Output D3: Y74 Solenoid for PTO Speed 2, diagnostic trouble code BCU 523814.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523811.01 — Y73 Solenoid for PTO Speed 1, Power Supply Fault at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 1 is switched on, power module PC5 measures less than 3 volts at the supply voltage for the output of the solenoid for PTO speed 1 (lead 0232, fuse F02 PLB/02).

BCU 523811.04 — Y73 Solenoid for PTO Speed 1 On, Current Too High at Power Module PC5
This diagnostic trouble code is triggered if, when Y73 solenoid for PTO speed 1 is switched on, power module PC5 measures a current of more than 30 amps in lead 7063. This indicates a short to ground in the circuit.

BCU 523811.05 — Y73 Solenoid for PTO Speed 1 On, No Current Present at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 1 is switched on, power module PC5 measures a current of less than 500 mA at the output of Y73 solenoid for PTO speed 1 (lead 7063). This indicates that the circuit is open.

BCU 523811.09 — Y73 Solenoid for PTO Speed 1, Incorrect CAN BUS Message from BCU (Power Module PC5)
This diagnostic trouble code is triggered if there is a problem transferring data between power module PC5 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC5 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523811.12 — Y73 Solenoid for PTO Speed 1 Off, Current Present at Power Module PC5
This diagnostic trouble code is triggered if, with the solenoid for PTO speed 1 switched off, power module PC5 measures a current of more than 1 A at the output of Y73 solenoid for PTO speed 1 (lead 7063). This indicates a short in the circuit or an internal fault in the power module.

BCU 523811.19 — Y73 Solenoid for PTO Speed 1, Incorrect CAN BUS Message (Power Module PC5)
This diagnostic trouble code is triggered if the output for switching the solenoid for PTO speed 1 is energized by more than one control unit.

BCU 523812.00 — Y74 Solenoid for PTO Speed 2, Current Overload Protection Active at Power Module PC5
This diagnostic trouble code is triggered if power module PC5 measures a total amperage in excess of 40 amps at the A1, B1 and C1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output A1: Y75 Solenoid for PTO Speed 3, diagnostic trouble code BCU 523815.00.
• Output B1: Y73 Solenoid for PTO Speed 1, diagnostic trouble code BCU 523813.00.
• Output C1: Y74 Solenoid for PTO Speed 2, diagnostic trouble code BCU 523812.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523812.01 — Y74 Solenoid for PTO Speed 2, Power Supply Fault at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 2 is switched on, power module PC5 measures less than 3 volts at the supply voltage for the output of the solenoid for PTO speed 2 (lead 0812, fuse F02 PLB/01).

BCU 523812.04 — Y74 Solenoid for PTO Speed 2 On, Current Too High at Power Module PC5
This diagnostic trouble code is triggered if, when Y74 solenoid for PTO speed 2 is switched on, power module PC5 measures a current of more than 30 amps in lead 7106. This indicates a short to ground in the circuit.

BCU 523812.05 — Y74 Solenoid for PTO Speed 2 On, No Current Present at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 2 is switched on, power module PC5 measures a current of less than 500 mA at the output of Y74 solenoid for PTO speed 2 (lead 7106). This indicates that the circuit is open.

BCU 523812.09 — Y74 Solenoid for PTO Speed 2, Incorrect CAN BUS Message from BCU (Power Module PC5)
This diagnostic trouble code is triggered if there is a problem transferring data between power module PC5 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC5 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523812.12 — Y74 Solenoid for PTO Speed 2 Off, Current Present at Power Module PC5
This diagnostic trouble code is triggered if, with the solenoid for PTO speed 2 switched off, power module PC5 measures a current of more than 1 A at the output of Y74 solenoid for PTO speed 2 (lead 7106). This indicates a short in the circuit or an internal fault in the power module.

BCU 523812.19 — Y74 Solenoid for PTO Speed 2, Incorrect CAN BUS Message (Power Module PC5)
This diagnostic trouble code is triggered if the output for switching the solenoid for PTO speed 2 is energized by more than one control unit.

BCU 523813.00 — Y73 Solenoid for PTO Speed 1, Current Overload Protection Active at Power Module PC5
This diagnostic trouble code is triggered if power module PC5 measures a total amperage in excess of 40 amps at the A1, B1 and C1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output A1: Y75 Solenoid for PTO Speed 3, diagnostic trouble code BCU 523815.00.
• Output B1: Y73 Solenoid for PTO Speed 1, diagnostic trouble code BCU 523813.00.
• Output C1: Y74 Solenoid for PTO Speed 2, diagnostic trouble code BCU 523812.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523813.01 — Y73 Solenoid for PTO Speed 1, Power Supply Fault at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 1 is switched on, power module PC5 measures less than 3 volts at the supply voltage for the output of the solenoid for PTO speed 1 (lead 0812, fuse F02 PLB/01).

BCU 523813.04 — Y73 Solenoid for PTO Speed 1 On, Current Too High at Power Module PC5
This diagnostic trouble code is triggered if, when Y73 solenoid for PTO speed 1 is switched on, power module PC5 measures a current of more than 30 amps in lead 7063. This indicates a short to ground in the circuit.

BCU 523813.05 — Y73 Solenoid for PTO Speed 1 On, No Current Present at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 1 is switched on, power module PC5 measures a current of less than 500 mA at the output of Y73 solenoid for PTO speed 1 (lead 7063). This indicates that the circuit is open.

BCU 523813.09 — Y73 Solenoid for PTO Speed 1, Incorrect CAN BUS Message from BCU (Power Module PC5)
This diagnostic trouble code is triggered if there is a problem transferring data between power module PC5 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC5 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523813.12 — Y73 Solenoid for PTO Speed 1 Off, Current Present at Power Module PC5
This diagnostic trouble code is triggered if, with the solenoid for PTO speed 1 switched off, power module PC5 measures a current of more than 1 A at the output of Y73 solenoid for PTO speed 1 (lead 7063). This indicates a short in the circuit or an internal fault in the power module.

BCU 523813.19 — Y73 Solenoid for PTO Speed 1, Incorrect CAN BUS Message (Power Module PC5)
This diagnostic trouble code is triggered if the output for switching the solenoid for PTO speed 1 is energized by more than one control unit.

BCU 523814.00 — Y74 Solenoid for PTO Speed 2, Current Overload Protection Active at Power Module PC5
This diagnostic trouble code is triggered if power module PC5 measures a total amperage in excess of 40 amps at the B3, C3 and D3 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output B3: Y75 Solenoid for PTO Speed 3, diagnostic trouble code BCU 523806.00.
• Output C3: Y73 Solenoid for PTO Speed 1, diagnostic trouble code BCU 523811.00.
• Output D3: Y74 Solenoid for PTO Speed 2, diagnostic trouble code BCU 523814.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523814.01 — Y74 Solenoid for PTO Speed 2, Power Supply Fault at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 2 is switched on, power module PC5 measures less than 3 volts at the supply voltage for the output of the solenoid for PTO speed 2 (lead 0232, fuse F02 PLB/02).

BCU 523814.04 — Y74 Solenoid for PTO Speed 2 On, Current Too High at Power Module PC5
This diagnostic trouble code is triggered if, when Y74 solenoid for PTO speed 2 is switched on, power module PC5 measures a current of more than 30 amps in lead 7106. This indicates a short to ground in the circuit.

BCU 523814.05 — Y74 Solenoid for PTO Speed 2 On, No Current Present at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 2 is switched on, power module PC5 measures a current of less than 500 mA at the output of Y74 solenoid for PTO speed 2 (lead 7106). This indicates that the circuit is open.

BCU 523814.09 — Y74 Solenoid for PTO Speed 2, Incorrect CAN BUS Message from BCU (Power Module PC5)
This diagnostic trouble code is triggered if there is a problem transferring data between power module PC5 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC5 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523814.12 — Y74 Solenoid for PTO Speed 2 Off, Current Present at Power Module PC5
This diagnostic trouble code is triggered if, with the solenoid for PTO speed 2 switched off, power module PC5 measures a current of more than 1 A at the output of Y74 solenoid for PTO speed 2 (lead 7106). This indicates a short in the circuit or an internal fault in the power module.

BCU 523814.19 — Y74 Solenoid for PTO Speed 2, Incorrect CAN BUS Message (Power Module PC5)
This diagnostic trouble code is triggered if the output for switching the solenoid for PTO speed 2 is energized by more than one control unit.

BCU 523815.00 — Y75 Solenoid for PTO Speed 3, Current Overload Protection Active at Power Module PC5
This diagnostic trouble code is triggered if power module PC5 measures a total amperage in excess of 40 amps at the A1, B1 and C1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output A1: Y75 Solenoid for PTO Speed 3, diagnostic trouble code BCU 523815.00.
• Output B1: Y73 Solenoid for PTO Speed 1, diagnostic trouble code BCU 523813.00.
• Output C1: Y74 Solenoid for PTO Speed 2, diagnostic trouble code BCU 523812.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523815.01 — Y75 Solenoid for PTO Speed 3, Power Supply Fault at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 3 is switched on, power module PC5 measures less than 3 volts at the supply voltage for the output of the solenoid for PTO speed 3 (lead 0812, fuse F02 PLB/01).

BCU 523815.04 — Y75 Solenoid for PTO Speed 3 On, Current Too High at Power Module PC5
This diagnostic trouble code is triggered if, when Y75 solenoid for PTO speed 3 is switched on, power module PC5 measures a current of more than 30 amps in lead 7115. This indicates a short to ground in the circuit.

BCU 523815.05 — Y75 Solenoid for PTO Speed 3 On, No Current Present at Power Module PC5
This diagnostic trouble code is triggered if, when the solenoid for PTO speed 3 is switched on, power module PC5 measures a current of less than 500 mA at the output of Y75 solenoid for PTO speed 3 (lead 7115). This indicates that the circuit is open.

BCU 523815.09 — Y75 Solenoid for PTO Speed 3, Incorrect CAN BUS Message from BCU (Power Module PC5)
This diagnostic trouble code is triggered if there is a problem transferring data between power module PC5 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC5 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523815.12 — Y75 Solenoid for PTO Speed 3 Off, Current Present at Power Module PC5
This diagnostic trouble code is triggered if, with the solenoid for PTO speed 3 switched off, power module PC5 measures a current of more than 1 A at the output of Y75 solenoid for PTO speed 3 (lead 7115). This indicates a short in the circuit or an internal fault in the power module.

BCU 523815.19 — Y75 Solenoid for PTO Speed 3, Incorrect CAN BUS Message (Power Module PC5)
This diagnostic trouble code is triggered if the output for switching the solenoid for PTO speed 3 is energized by more than one control unit.

BCU 523826.03 — NonExistent Function Activated
This diagnostic trouble code is generated if the control unit recognizes an open circuit when a nonexistent function is activated in address BCU071.

BCU 523826.04 — NonExistent Function Activated
This diagnostic trouble code is generated if the control unit recognizes an open circuit when a nonexistent function is activated in address BCU071.

BCU 523834.03 — B27 DepthSetting Potentiometer, Voltage Too High
This diagnostic trouble code is generated if the BCU
control unit detects that the voltage at the signal input of the depthsetting potentiometer is too high (above 4.75 V). This indicates a malfunction in the circuit of the depthsetting potentiometer.

BCU 523834.04 — B27 DepthSetting Potentiometer, Voltage Too Low
This diagnostic trouble code is generated if the BCU control unit detects that the voltage at the signal input of the depthsetting potentiometer is too low (below 0.25 V). This indicates a malfunction in the circuit of the depthsetting potentiometer.

BCU 523839.14 — INFORMATION FOR OPERATOR: Handbrake is On and a Gear is Selected
The diagnostic trouble code is generated when the BCU control unit detects that a gear is selected while the handbrake is on. This diagnostic trouble code is not stored in the control unit’s error memory. It is intended only as information for the operator.

BCU 523839.31 — INFORMATION FOR OPERATOR: Handbrake Activated While Wheel Speed is Recognized
The diagnostic trouble code is generated when the BCU control unit detects wheel speed even though the handbrake is on (wheel speed is present). This diagnostic trouble code is not stored in the control unit’s error memory. It is intended only as information for the operator.

BCU 523843.02 — S24 Quick Withdrawal Switch, Switch Status out of Valid Range
This diagnostic trouble code is generated if the BCU control unit detects an undefined voltage at the signal input of the quick withdrawal switch. This indicates a malfunction in the circuit of the quick withdrawal switch.

BCU 523843.03 — S24 Quick Withdrawal Switch, Voltage Too High
This diagnostic trouble code is generated if the BCU control unit detects that the voltage at the signal input of the quick withdrawal switch is too high (above 10.5 V). This indicates a malfunction in the circuit of the quick withdrawal switch. The diagnostic trouble code can also be generated due to an operating error (switch actuated during the bulb check).

BCU 523843.04 — S24 Quick Withdrawal Switch, Voltage Too Low
This diagnostic trouble code is generated if the BCU control unit detects that the voltage at the signal input of the quick withdrawal switch is too low (below 1 V). This indicates a malfunction in the circuit of the quick withdrawal switch.

BCU 523904.31 — INFORMATION FOR OPERATOR: Operator Presence Switch Not Activated While Front PTO is Engaged
This operator information (diagnostic trouble code) is generated when the front PTO is selected which requires the operator presence switch to be activated but the operator has left the seat. If the diagnostic trouble code is generated though the operator is seated: Perform “S40 Operator Presence Switch, Operational Check” in Section 245, Group BCU.

BCU 523905.31 — Y01 Front PTO Solenoid Valve, Fault
The diagnostic trouble code is generated when the BCU control unit detects an open circuit to the front PTO solenoid valve.

BCU 523908.14 — INFORMATION FOR OPERATOR: Remote Control Switch for Rear PTO is Activated
This operator information (diagnostic trouble code) is generated when the remote control switch for the rear PTO is turned on.

BCU 523908.31 — INFORMATION FOR OPERATOR: Rear PTO Can Now Be Switched On at Rear PTO Remote Control Switch
This operator information (diagnostic trouble code) is generated when the remote control switch for the rear PTO is turned on.

BCU 523919.00 — E18/1 Inner Worklights on Front of Roof, Current Overload Protection Active at Power Module PC0
This diagnostic trouble code is triggered if power module PC0 measures a total amperage in excess of 40 amps at the E3 and H1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output E3: E18/1 Inner worklights on front of roof, diagnostic trouble code BCU 523919.00.
• Output H1: E18/2 Outer worklights on front of roof, diagnostic trouble code BCU 523920.00. This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523919.01 — E18/1 Inner Worklights on Front of Roof, Power Supply Fault at Power Module PC0
This diagnostic trouble code is generated if, when the inner worklights on front of roof are switched on, power module PC0 measures less than 3 volts at the supply voltage for the output of the inner worklights on front of roof (lead 0802).

BCU 523919.04 — E18/1 Inner Worklights on Front of Roof On, Current Too High at Power Module PC0
This diagnostic trouble code is triggered if, when the inner worklight on front of roof (E18/1) are switched on, power module PC0 measures a current of more than 15 amps in lead 1046. This indicates a short to ground in the circuit.

BCU 523919.05 — E18/1 Inner Worklights on Front of Roof On, No Current Present at Power Module PC0
This diagnostic trouble code is triggered if, when the inner worklights on front of roof are switched on, power module PC0 measures a current of less than 500 amps at the output to inner worklights on front of roof (E18/1) (lead 1046). This indicates that the circuit is open.

BCU 523919.09 — E18/1 Inner Worklights on Front of Roof, Incorrect CAN BUS Message from BCU (Power Module PC0)
This diagnostic trouble code is generated if there is a problem transferring data between power module PC0 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC0 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523919.12 — E18/1 Inner Worklights on Front of Roof Off, Current Present at Power Module PC0
This diagnostic trouble code is triggered if, with the inner worklights on front of roof switched off, power module PC0 measures a current of more than 1 amp at the output to inner worklight on front of roof (E18/1) (lead 1046). This indicates a short in the circuit or an internal fault in the power module.

BCU 523919.19 — E18/1 Inner Worklights on Front of Roof, Incorrect CAN BUS Message (Power Module PC0)
This diagnostic trouble code is triggered if the output for switching the inner worklights on front of roof is energized by more than one control unit.

BCU 523920.00 — E18/2 Outer Worklights on Front of Roof, Current Overload Protection Active at Power Module PC0
This diagnostic trouble code is triggered if power module PC0 measures a total amperage in excess of 40 amps at the E3 and H1 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output E3: E18/1 Inner worklights on front of roof, diagnostic trouble code BCU 523919.00.
• Output H1: E18/2 Outer worklights on front of roof, diagnostic trouble code BCU 523920.00.
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523920.01 — E18/2 Outer Worklights on Front of Roof, Power Supply Fault at Power Module PC0
This diagnostic trouble code is generated if, when the outer worklights on front of roof are switched on, power module PC0 measures less than 3 volts at the supply voltage for the output of the outer worklights on front of roof (lead 0802).

BCU 523920.04 — E18/2 Outer Worklights on Front of Roof On, Current Too High at Power Module PC0
This diagnostic trouble code is triggered if, when the outer worklights on front of roof (E18/2) are switched on, power module PC0 measures a current of more than 15 amps in lead 1047. This indicates a short to ground in the circuit.

BCU 523920.05 — E18/2 Outer Worklights on Front of Roof On, No Current Present at Power Module PC0
This diagnostic trouble code is triggered if, when the outer worklights on front of roof are switched on, power module PC0 measures a current of less than 500 amps at the output to outer worklights on front of roof (E18/2) (lead 1047). This indicates that the circuit is open.

BCU 523920.09 — E18/2 Outer Worklights on Front of Roof, Incorrect CAN BUS Message from BCU (Power Module PC0)
This diagnostic trouble code is generated if there is a problem transferring data between power module PC0 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC0 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523920.12 — E18/2 Outer Worklights on Front of Roof Off, Current Present at Power Module PC0
This diagnostic trouble code is triggered if, with the outer worklights on front of roof switched off, power module PC0 measures a current of more than 1 amp at the output to outer worklight on front of roof (E18/2) (lead 1047). This indicates a short in the circuit or an internal fault in the power module.

BCU 523920.19 — E18/2 Outer Worklights on Front of Roof, Incorrect CAN BUS Message (Power Module PC0)
This diagnostic trouble code is triggered if the output for switching the outer worklights on front of roof is energized by more than one control unit.

BCU 523921.00 — E11/2 /E31R Worklights on Rear of Roof, Current Overload Protection Active at Power Module PC0
This diagnostic trouble code is triggered if power module PC0 measures a total amperage in excess of 40 amps at the B3, C3 and D3 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output B3: E11/2 /E31R Worklights on Rear of Roof, Diagnostic Trouble Code BCU 523921.00
• Output C3: E31L Xenon (HID) Worklights on Rear of Roof, Diagnostic Trouble Code BCU 523924.00.
• Output D3: E07 Left Light on Cab Frame (Low Beam), Diagnostic Trouble Code BIF 523900.00 This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523921.01 — E11/2 /E31R Worklights on Rear of Roof, Power Supply Fault at Power Module PC0
This diagnostic trouble code is generated if, when the worklights on rear of roof are switched on, power module PC0 measures less than 3 volts at the supply voltage for the output of the worklights on rear of roof (lead 0782).

BCU 523921.04 — E11/2 /E31R Worklights on Rear of Roof On, Current Too High at Power Module PC0
This diagnostic trouble code is triggered if, when the worklights on rear of roof (E11/2 /E31R) are switched on, power module PC0 measures a current of more than 15 amps in lead 1087. This indicates a short to ground in the circuit.

BCU 523921.05 — E11/2 /E31R Worklights on Rear of Roof On, No Current Present at Power Module PC0
This diagnostic trouble code is triggered if, when the worklights on rear of roof are switched on, power module PC0 measures a current of less than 500 amps at the output to worklights on rear of roof (E11/2) or xenon (HID) worklights on rear of roof (right) (E31R) (lead 1087). This indicates that the circuit is open.

BCU 523921.09 — E11/2 /E31R Worklights on Rear of Roof, Incorrect CAN BUS Message from BCU (Power Module PC0)
This diagnostic trouble code is generated if there is a problem transferring data between power module PC0 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC0 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523921.12 — E11/2 /E31R Worklights on Rear of Roof Off, Current Present at Power Module PC0
This diagnostic trouble code is triggered if, with the worklights on rear of roof or the or xenon (HID) worklights on rear of roof (right) switched off, power module PC0 measures a current of more than 1 amp at the output to worklights on rear of roof (E11/2) or xenon (HID) worklights on rear of roof (right) (E31R) (lead 1087). This indicates a short in the circuit or an internal fault in the power module.

BCU 523921.19 — E11/2 /E31R Worklights on Rear of Roof, Incorrect CAN BUS Message (Power Module PC0)
This diagnostic trouble code is triggered if the output for switching the worklights on rear of roof is energized by more than one control unit.

BCU 523924.00 — E31L Left Xenon (HID) Worklight on Rear of Roof, Current Overload Protection Active at Power Module PC0
This diagnostic trouble code is triggered if power module PC0 measures a total amperage in excess of 40 amps at the B3, C3 and D3 outputs. The following functions are monitored together and may trigger additional diagnostic trouble codes that affect the current overload protection:
• Output B3: E11/2 /E31R Worklights on Rear of Roof, Diagnostic Trouble Code BCU 523921.00
• Output C3: E31L Xenon (HID) Worklight on Rear of Roof (Left), Diagnostic Trouble Code BCU 523924.00.
• Output D3: E07 Left Light on Cab Frame (Low Beam), Diagnostic Trouble Code BIF 523900.00
This indicates a short to ground or a defective component in one of the monitored circuits.

BCU 523924.01 — E31L Left Xenon (HID) Worklight on Rear of Roof, Power Supply Fault at Power Module PC0
This diagnostic trouble code is triggered if, when the worklights on rear of roof are switched on, power module PC0 measures less than 3 volts at the supply voltage for the output of the worklights on rear of roof (lead 0782, fuse F05/09 or F07/09).

BCU 523924.04 — E31L Left Xenon (HID) Worklight on Rear of Roof, Current Too High at Power Module PC0
This diagnostic trouble code is triggered if, when the left xenon (HID) worklight on rear of roof (E31L) is switched on, power module PC0 measures a current of more than 15 amps in lead 1036. This indicates a short to ground in the circuit.

BCU 523924.05 — E31L Left Xenon (HID) Worklight on Rear of Roof Switched On, No Current Present at Power Module PC0
This diagnostic trouble code is triggered if, when the worklights on rear of roof are switched on, power module PC0 measures a current of less than 500 mA at the output to left xenon (HID) worklight on rear of roof (E31L) (lead 1036). This indicates that the circuit is open.

BCU 523924.09 — E31L Left Xenon (HID) Worklight on Rear of Roof, Incorrect CAN BUS Message from BCU
This diagnostic trouble code is generated if there is a problem transferring data between power module PC0 and the BCU control unit. Reception of one, several or all of the CAN messages transmitted by the BCU to power module PC0 is intermittent or nonexistent (intermittent reception could be due to a loose wire).

BCU 523924.12 — E31L Left Xenon (HID) Worklight on Rear of Roof Switched Off, Current Present at Power Module PC0
This diagnostic trouble code is triggered if, with the left xenon (HID) worklight on rear of roof switched off, power module PC0 measures a current of more than 1 amp at the output to the left xenon (HID) worklight on rear of roof (E31L) (lead 1036). This indicates a short in the circuit or an internal fault in the power module.

BCU 523924.19 — E31L Left Xenon (HID) Worklight on Rear of Roof, Incorrect CAN BUS Message (Power Module PC0)
This diagnostic trouble code is triggered if the output for switching the xenon (HID) worklights on rear of roof is energized by more than one control unit.

BCU 524055.11 — Control Unit Internal Fault
If a fault occurs when the internal module (EEPROM) intervenes, this diagnostic trouble code is generated.

BCU 524055.31 — Control Unit Not Calibrated
The diagnostic trouble code is generated if the BCU has not been calibrated yet, is incorrectly calibrated or if calibration has not been completed. It is also possible that this diagnostic trouble code is generated by mistake during hitch calibration. It is not necessary to perform the calibration procedure again unless this diagnostic trouble code cannot be deleted. The diagnostic trouble code triggers the alarm level “Information”.

BCU 524216.02 — INFORMATION FOR OPERATOR: Switch Off the Front PTO Switch
This operator information (diagnostic trouble code) is generated when HMS Plus is activated and then the front PTO is turned on although the front PTO is not integrated in the program of HMS Plus.

BCU 524216.31 — INFORMATION FOR OPERATOR: Front PTO was Switched On When Engine Was Started
This diagnostic trouble code can only be triggered if the front PTO is activated in address BCU027.

BCU 524224.02 — INFORMATION FOR OPERATOR: Switch Off the Rear PTO Switch
This operator information (diagnostic trouble code) is generated when HMS Plus is activated and then the rear PTO is turned on although the rear PTO is not integrated in the program of HMS Plus.

BCU 524224.14 — INFORMATION FOR OPERATOR: Switch On the Rear PTO Switch.
This operator information (diagnostic trouble code) is generated when HMS Plus is activated and the rear PTO switch is not turned on.

BCU 524224.31 — INFORMATION FOR OPERATOR: Rear PTO Was Switched On
When Engine Was Started The diagnostic trouble code is generated when the control unit detects that the rear PTO switch is closed during starting (ignition ON).

BCU 524235.31 — Y03 FrontWheel Drive Solenoid Valve, Fault
The diagnostic trouble code is generated when the BCU control unit detects an open circuit to the frontwheel drive solenoid valve.

BCU 524252.31 — Y04/Y81 Solenoid Valve (Proportional Solenoid Valve) for Rear PTO, Fault
The diagnostic trouble code is generated when the BCU control unit detects an open circuit to the rear PTO solenoid valve (proportional solenoid valve).

BCU 600006.31 — Diagnostic Trouble Code Not Known
This diagnostic trouble code is triggered by the CommandCenter (DTI) when the DTI receives a BCU diagnostic trouble code via the CAN BUS that is not stored in the DTI memory. This “general” diagnostic trouble code enables the CommandCenter (DTI) to display information relating to this unknown BCU diagnostic trouble code.