Chassis (CCU) Control Unit and Vehicle Load Center (VLC) Control Unit share the same control unit flex box (Vehicle Control Unit [CCU & VLC]). CCU and VLC are common between PowerShift Transmission (PST) and AutoPowr™ / IVT™.
CCU application controls, monitors, and protects various chassis (fuel level, iTEC™ & alarms), drive train (differential lock, rear PTO), hydraulic (filter restriction, oil temperature, oil pressure), engine (air filter restriction) functions.
John Deere CCU fault codes / John Deere CCU diagnostic trouble codes
NOTE:This page only indicates the meaning of the fault codes. For complete troubleshooting information, see the technical manuals.
CCU 000096.03 — Fuel Level Sensor Circuit Voltage High
Code Caused By: Fuel level outside normal range, indicating an open circuit.
Control Unit Response: Function Degraded
CCU 000096.04 — Fuel Level Sensor Circuit Voltage Low
Code Caused By: Fuel level sensor circuit output voltage below 0.2 V.
Control Unit Response: Function Degraded
CCU 000096.17 — Fuel Level Low
Code Caused By: Chassis Control Unit (CCU) detects that the fuel level percent is indicating a low fuel level (below 3%).
Note: Ensure that there is fuel in the tank.
Control Unit Response: Function Degraded
CCU 000237.02 — VIN Security Data Conflict
Code Caused By: Vehicle Identification Number (VIN) from other control units is not the same.
Attention: If any DTCs are stored indicating CAN messages are missing, diagnose those codes first.
Control Unit Response: Limited Function
CCU 000237.14 — VIN Security Not Enabled
Code Caused By: Vehicle Identification Number (VIN) Security has not been enabled.
Attention: If any DTCs are stored indicating CAN messages are missing, diagnose those codes first.
Control Unit Response: Limited Function
CCU 000237.31 — VIN Security Messages Missing
Code Caused By: Vehicle Identification Number (VIN) not received from other control units.
Attention: If any DTCs are stored indicating CAN messages are missing, diagnose those codes first.
Control Unit Response: Limited Function
CCU 000567.05 — Front Differential Lock Solenoid Circuit Fault
Code Caused By: Chassis Control Unit (CCU) detects a malfunction in the front differential lock solenoid driver or circuit (open, short, or over-temperature).
Control Unit Response: Function Degraded
CCU 000569.05 — Rear Differential Lock Solenoid Circuit Fault
Code Caused By: Chassis Control Unit (CCU) detects a malfunction in the rear differential lock solenoid driver or circuit (open, short, or over-temperature).
Control Unit Response: Function Degraded
CCU 000628.02 (CCU 628.02)- CCU EOL Data Fault
Code caused by: Chassis Control Unit (CCU) detects that its End Of Line (EOL) memory failed at start up.
CCU 000630.14 — Rear PTO Configuration Invalid
Code Caused By: Chassis Control Unit (CCU) detects that the rear PTO configuration is incorrect.
Control Unit Response: Limited Function
CCU 001079.03 — CCU Sensor Supply Voltage High
Code caused by: Voltage from sensor supply higher than normal operating range. Sensor supply voltage above 5.2 V.
Control Unit Response: Limited Function
CCU 001079.04 (CCU 1079.04)— CCU Sensor Supply Voltage Low
Code
CCU 001079.04 — CCU Sensor Supply Voltage Low
Code caused by: Voltage from sensor supply lower than normal operating range. Sensor supply voltage below 4.8 V.
Control Unit Response: Limited Function
CCU 001086.03 — Air Brake Pressure Sensor Circuit Voltage High
Code Caused By: Air brake pressure sensor voltage above normal, or shorted to high source.
Control Unit Response: Function Degraded
CCU 001086.04 — Air Brake Pressure Sensor Circuit Voltage Low
Code Caused By: Air brake pressure sensor voltage below normal, or shorted to low source.
Control Unit Response: Function Degraded
CCU 001086.18 — Air Brake Pressure Low
Code Caused By: Chassis Control Unit (CCU) detects that the air brake pressure switch is open, indicating insufficient pressure.
Attention: This code will generate every time vehicle is started and air brake pressure is insufficient to disengage the air trailer brakes. It may be necessary to wait over 1 minute for brakes to release.
Control Unit Response: Function Degraded
CCU 001638.00 — Hydraulic Oil Temperature Very Hot
Code caused by: Chassis Control Unit (CCU) detects that the hydraulic oil temperature sensor indicates fluid is too hot to continue operation.
Attention: Operating vehicle with low hydraulic oil level can cause code.
NOTE: If code occurs only during transport speeds, inspect transmission suction screen for plugging and transmission scavenge pump for damage.
Control Unit Response: Function Degraded
CCU 001638.03 — Hydraulic Oil Temperature Sensor Circuit Voltage High
Code caused by: Chassis Control Unit (CCU) detects that the hydraulic oil temperature sensor circuit is open.
Attention: The alarm also occurs if the engine speed is above 400 rpm and the hydraulic oil temperature is below – 20 °C (-4 °F), while the engine coolant temperature is above 50 °C (122 °F), for longer than 7 seconds.
Control Unit Response: Function Degraded
CCU 001638.04 — Hydraulic Oil Temperature Sensor Circuit Voltage Low
Code caused by: Chassis Control Unit (CCU) detects that the hydraulic oil temperature sensor is shorted to ground. Attention: The alarm also occurs if the engine speed is above 400 rpm and the hydraulic oil temperature is above 115 °C (239 °F), while the engine coolant temperature is below 30 °C (86 °F), for longer than 7 seconds.
Control Unit Response: Function Degraded
CCU 001638.16 — Hydraulic Oil Temperature Hot
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic oil temperature sensor indicates fluid is warmer than if systems were functioning normally.
Attention: Operating vehicle with low hydraulic oil level can cause code.
NOTE: If code occurs only during transport speeds, inspect transmission suction screen for plugging and transmission scavenge pump for damage.
Control Unit Response: Function Degraded
CCU 001713.00 (CCU 1713.00)— Hydraulic Oil Filter Restricted
CCU 001713.00 — Hydraulic Oil Filter Restricted
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic oil filter restriction sensor voltage is high, for an extended period of time.
Control Unit Response: Function Degraded
CCU 001883.00 — Rear PTO Overspeed
Code Caused By: Chassis Control Unit (CCU) detects that the rear PTO speed sensor indicates the rear PTO shaft is turning too fast.
Control Unit Response: Function Degraded
CCU 001883.01 — Rear PTO Underspeed
Code Caused By: Chassis Control Unit (CCU) detects that the rear PTO speed sensor indicates the rear PTO shaft is turning too slow.
Attention: A low rear PTO calibration value could cause code to occur. A low engine speed with a heavy implement may cause code to occur.
Note: Ensure CommandCenter™ has rear PTO engagement set appropriately. Auto mode automatically detects and compensates for heavy PTO loads. If the rear PTO is not up to speed, auto mode increases the engagement rate. A high rate can be used for applications where rear PTO clutch engagement needs to be unusually aggressive.
Control Unit Response: Function Degraded
CCU 001883.13 — Rear PTO Not Calibrated
Code Caused By: Chassis Control Unit (CCU) detects that the rear PTO needs to be calibrated.
Control Unit Response: Function Degraded
CCU 002392.05 — Back Up Alarm Circuit Fault
Code Caused By: Chassis Control Unit (CCU) detects an output malfunction in the back up alarm circuit.
Control Unit Response: Function Degraded
CCU 002602.01 — Hydraulic Clean Oil Reservoir Level Very Low
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic oil level switch indicates that the oil level is too low to continue operation.
Attention: Detection is initiated when the hydraulic oil temperature is high and engine is running at a certain rpm, while low level is indicated. Differential case has been depleted of oil and is not supplying the clean oil reservoir.
Control Unit Response: Function Degraded
CCU 002602.02 — Hydraulic Clean Oil Reservoir Level Switch Fault
Code Caused By: Chassis Control Unit (CCU) detects a malfunction in the hydraulic clean oil reservoir (COR) level switch.
Control Unit Response: Function Degraded
CCU 002602.18 — Hydraulic Oil Level Low
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic clean oil reservoir (COR) level switch indicates low oil level.
Attention: Detection is initiated when the hydraulic oil temperature is low and the engine is running for at least 2 —10 seconds, (depending upon engine rpm), while low level is indicated. Oil is leaking from secondary hydraulic circuit (SCV/Hitch) or from inlet lines to either the piston pump and/or steering pump or the charge pump has failed during vehicle operation.
NOTE: If codes CCU 002602.18, HCU 002602.18 and SCC 002602.18 are present and the hitch will not raise or lower, suspect the hitch spool to be stuck in the retract position or the surge relief valve is stuck open. This causes oil from the clean oil reservoir to drain to sump.
Control Unit Response: Function Degraded
CCU 002818.31 (CCU 2818.31)- Operator Presence Switch Not Activated
Code caused by: Rear PTO switch ON and operator not present.
CCU 003509.03 (CCU 3509.03)- Sensor Supply Voltage Out of Range High
Code caused by: Voltage from sensor supply higher than normal operating range. Sensor supply voltage above 5.2 V.
CCU 003509.04 (CCU 3509.04)- Sensor Supply Voltage Out of Range Low
Code caused by: Voltage from sensor supply lower than normal operating range. Sensor supply voltage below 4.8 V.
CCU 522260.02 — Wheel Speed Sensors Mismatch
Code Caused By: Chassis Control Unit (CCU) detects that the primary and secondary wheel speed sensors do not match.
Control Unit Response: Function Degraded
CCU 522384.14 — 4R/5R PTO Inhibited
Code Caused By: Chassis Control Unit (CCU) detects that the vehicle is in a high speed reverse gear (4R or 5R) while rear PTO turned on.
Control Unit Response: Function Degraded
CCU 523698.09 — AMS Display Message Missing
Code Caused By: Chassis Control Unit (CCU) not receiving required messages from the GreenStar™ Display.
Control Unit Response: Function Degraded
CCU 523316.04 – CCU Switched Supply Voltage Low
Code caused by: Switched supply voltage to CCU below 9.0 V.
CCU 523749.16 — PTO Clutch Slipping Too Long
Code Caused By: Repeated engagement of PTO with heavy load by operator. High engine speed and engagement of PTO cause engine rpm to fall to 500 rpm and overheating of PTO clutch. CCU will turn PTO OFF and generate code. Code will display for seven seconds if PTO switch is turned OFF. If switch is not turned OFF, code will display until switch is cycled OFF. Switch will not engage PTO until seven seconds have elapsed to give PTO clutch time to cool.
Attention: Ensure CommandCenter™ has rear PTO engagement set appropriately. Auto mode automatically detects and compensates for heavy PTO loads. If the rear PTO is not up to speed, auto mode increases the engagement rate. A high rate can be used for applications where rear PTO clutch engagement needs to be unusually aggressive.
Control Unit Response: Function Degraded
CCU 523839.02 – Secondary Brake Switch Conflict
Code caused by: Secondary brake is disengaged but the switch is ON or secondary brake is engaged but the switch is OFF. Secondary brake lever normally open and normally closed switches indicate conflicting states. Brake is currently disengaged/engaged and the on and off signals from the secondary brake switch are both high or both low continuously for more than 0.5 seconds.
CCU 523844.12 – Differential Lock Braking Disabled
Code caused by: Differential lock switch has been closed for more than 5 minutes.
CCU 523851.02 — iTEC™ Disabled Due To HCC/SCC/TEC
Code Caused By: Chassis Control Unit (CCU) detects that the Intelligent Total Equipment Control ( iTEC™) aborted the sequence because of a lack of response from the Hitch Control Unit (HCC), or Selective Control Valve Control Unit (SCC), or Tractor Equipment Control Unit (TEC).
Attention: Aborts iTEC™ sequence. Associated Codes: This code is most likely a result of a Hitch Control Unit (HCC) code, or Selective Control Valve Control Unit (SCC) code, or Tractor Equipment Control Unit (TEC) code. Each individual HCC, SCC, or TEC code must be resolved before conducting CCU 523851.02 code diagnostics.
Control Unit Response: Function Degraded
CCU 523907.02 – PTO Remote Enable Switch Conflict
Code caused by: ON and OFF switches receives high or low voltage input.
CCU 523908.02 – Rear PTO External Switch Conflict
Code Caused By: CCU control unit detects that the rear PTO external switch signals simultaneous ON and OFF states.
CCU 523916.00 — Hydraulic Oil Filter Restriction Sensor Bypassed Under 1500 rpm
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic oil filter restriction sensor detected high pressure while the engine speed is below 1500 rpm, for longer than 15 seconds.
Associated Codes: This code is most likely a result of 523916.03 or 523916.04 codes. Each individual code 523916.03 or 523916.04 must be resolved before conducting 523916.00 code diagnostics.
Control Unit Response: Function Degraded
CCU 523916.03 — Hydraulic Oil Filter Restriction Sensor Circuit Voltage High
Code Caused By: Chassis Control Unit (CCU) detects hydraulic oil filter restriction sensor voltage is above normal, or shorted to high source.
Attention: Assumes filter not restricted. If last known as restricted, slow idle is commanded until the operator shuts off engine.
Control Unit Response: Function Degraded
CCU 523916.04 — Hydraulic Oil Filter Restriction Sensor Circuit Voltage Low
Code Caused By: Chassis Control Unit (CCU) detects hydraulic oil filter restriction sensor voltage is below normal, or shorted to low source.
Attention: Assumes filter not restricted. If last known as restricted, slow idle is commanded until the operator shuts off engine.
Control Unit Response: Function Degraded
CCU 523916.15 — Hydraulic Oil Filter Restricted
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic oil filter restriction sensor detected pressure is above 350 kPa (3.5 bar [50.75 PSI]), but below 425 kPa (4.25 bar [61.64 PSI]) while the engine speed is above 800 rpm, for longer than 15 seconds.
Control Unit Response: Function Degraded
CCU 523916.16 — Hydraulic Oil Filter Restriction Sensor Bypassed Over 1500 rpm
Code Caused By: Chassis Control Unit (CCU) detects that the hydraulic oil filter restriction sensor detected high pressure while the engine speed is above 1500 rpm, for longer than 15 seconds.
Associated Codes: This code is most likely a result of 523916.03 or 523916.04 codes. Each individual code 523916.03 or 523916.04 must be resolved before conducting 523916.16 code diagnostics.
Control Unit Response: Function Degraded
CCU 524016.04 — CCU Switched Supply Voltage Low
Code Caused By: Chassis Control Unit (CCU) detects that the switched supply voltage (wake-up voltage) from the Cab Load Center (CLC) control unit is low.
Attention: Wake-up voltage is switched battery voltage (ELX), 12.5—14.5 volts. Associated Codes: Other CCU XXXXXX.04 low voltage codes for sensors (clean oil reservoir level, clutch disengaged, and primary wheel speed) powered by this input are disabled.
Control Unit Response: Function Degraded
CCU 524037.02 – MFWD Switch Circuit Fault
Code caused by: Brake assist and auto switch inputs are detected as ON simultaneously for longer than 3 seconds.
CCU 524223.03 — Differential Lock Switch Circuit Voltage High
Code Caused By: Chassis Control Unit (CCU) detects that the differential lock switch has been closed for more than 15 seconds after power-up.
Note: Ensure foot or floor mat is not resting on differential lock switch.
Attention: While fault active, the differential lock can not be engaged.
Control Unit Response: Function Degraded
CCU 524224.02 — PTO Switch Voltage Mismatch
Code Caused By: Chassis Control Unit (CCU) detects that the rear PTO on switch direct input signal differs from the Armrest Control Unit (ACU) CAN message for the rear PTO on switch.
Associated Codes: This code is most likely a result of an Armrest Control Unit (ACU) code. Each individual ACU code must be resolved before conducting CCU 524224.02 code diagnostics.
Control Unit Response: Function Degraded
CCU 524224.14 — Rear PTO Disabled
Code Caused By: Chassis Control Unit (CCU) detects that the rear PTO switch is commanded on or off but input to CCU is opposite.
Associated Codes: This code is most likely a result of an Armrest Control Unit (ACU) code. Each individual ACU code must be resolved before conducting CCU 524224.14 code diagnostics. If DTC CCU 001883.00, CCU 001883.01, CCU 001883.13 are present, diagnose these codes before proceeding with current diagnosis.
NOTE: CCU 524224.14 will be generated when any of the following occur:
– One or more of the switches turned ON while engine not running.
– One or more of the switches turned ON while starting engine (most common).
– Preselector switch comes ON while PTO turned OFF.
– External switch turned ON while PTO turned OFF.
– Preselector switch goes OFF while PTO is in remote and rear PTO switch is ON.
– Preselector switch goes OFF after PTO ON remotely.
– Rear PTO switch turned ON, then iTEC™ turned PTO OFF, then iTEC™ – was turned
– OFF.
– Armrest Control Unit (ACU) not configured properly.
– CAB Control Unit (CAB) not configured properly.
– VIN security diagnostic trouble code active.
Control Unit Response: Function Degraded
CCU 524235.05 — MFWD Solenoid Circuit Fault
Code Caused By: Chassis Control Unit (CCU) detects a malfunction in the MFWD solenoid driver or circuit (open, short, or over-temperature), while MFWD disengaged.
Control Unit Response: Function Degraded
CCU 524236.31 — MFWD Switch/ iTEC™ Conflict
Code Caused By: Chassis Control Unit (CCU) detects that the Intelligent Total Equipment Control ( iTEC™) was turned off while commanding MFWD and iTEC™ command differs from MFWD switch command.
Note: This code is operator induced.
Attention: Code can be cleared by turning Intelligent Total Equipment Control ( iTEC™) back ON or cycling MFWD Switch.
Control Unit Response: Function Degraded
CCU 524251.31 — Operator Not Present With Rear PTO On
Code Caused By: Chassis Control Unit (CCU) detects that PTO engaged while operator is out of seat or operator leaves seat while PTO is engaged.
Note: This code can be operator induced.
Attention: Ensure operator weighs enough to activate presence (seat) switch and inspect seat wiring harness condition.
Control Unit Response: Function Degraded
CCU 524252.05 — Rear PTO Solenoid Circuit Fault
Code Caused By: Chassis Control Unit (CCU) detects a malfunction in rear PTO solenoid driver or circuit (open, short, or over-temperature), while rear PTO is disengaged.
Attention: The CCU commanded 100% current (1100 Milliampere) but received below 75% current (825 Milliampere) or commanded 0% current (0 Milliampere) but received above 10% current (110 Milliampere).
Control Unit Response: Function Degraded
CCU 524255.31 – Rear Remote PTO Enabled
CCU 524255.31 — Rear PTO Remote Switch Enabled
Code Caused By: Chassis Control Unit (CCU) detects that rear PTO external switch function is being requested while rear PTO switch is off.
Note: This code serves as a safety alert, when external PTO switch engagement is used. The CCU is ready to turn on rear PTO with external switch.
Attention: Turn on rear PTO preselector switch first, the rear PTO switch second, and then rear PTO external switch third. Diagnostics only need to be conducted if rear PTO system not functional.
Control Unit Response: Function Degraded
CCU 600006.31 – Default DTC
Code caused by: Solenoid is commanded on and the return voltage is less than 0.75 V or greater than 2.00 V for more than 2 seconds.
Non-Tractor CCU Code List
CCU 000100.01 (CCU 100.01)-Engine Oil Pressure Signal Extremely Low
CCU 000100.04 (CCU 100.04)-Engine Oil Pressure Signal Out of Range Low
CCU 000110.03 (CCU 110.03)-Engine Coolant Temperature Signal Out of Range High
CCU 000110.04 (CCU 110.04)-Engine Coolant Temperature Signal Out of Range Low
CCU 000110.16 (CCU 110.16)-Engine Coolant Temperature Signal Moderately High