The GPM control software is used for activation of the gear solenoids. Included in control unit for gear shifting (DirectDrive transmission).
The GPM control software is used for shifting gears of the DirectDrive transmission. The following information is processed and implemented:
– Reverse drive lever position
– Shift unit position
– Engine speed
– Vehicle speed
– Operating mode settings

John Deere GPM fault codes / John Deere GPM diagnostic trouble codes

NOTE:This page only indicates the meaning of the fault codes. For complete troubleshooting information, see the technical manuals.

GPM 000168.04 (GPM 168.04)— Supply Voltage (BAT) Too Low
Supply voltage (BAT) below 9 V.

GPM 000191.00 (GPM 191.00)— INFORMATION FOR OPERATOR: Reduce Travel Speed Using Brakes
To prevent transmission damage and for safety reasons, actuate the brakes to reduce the travel speed.

GPM 000628.02 (GPM 628.02)— Control Software Internal Fault
The diagnostic trouble code is generated if the control software detects a faulty EOL parameter during power-up. The parameters are reset to default values.
Reaction of control software: Limited or no function of the control software.

GPM 000630.02 (GPM 630.02)— Control Software Internal Fault
The diagnostic trouble code is generated if the control software detects an incorrect entry in the internal memory.
Reaction of control software: Limited or no function of the control software.

GPM 521926.12 — INFORMATION FOR OPERATOR: Range C Jumped Out
The range jumped out. Engage the range again.

GPM 521927.12 — INFORMATION FOR OPERATOR: Range B Jumped Out
The range jumped out. Engage the range again.

GPM 521928.05 — Gear 8 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 521928.06 — Gear 8 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 521928.07 — Gear 8 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 521928.12 — INFORMATION FOR OPERATOR: Gear 8 Jumped Out
The gear jumped out. Engage the gear again.

GPM 521928.17 — Time-Out When Engaging Gear 8
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 521928.18 — INFORMATION FOR OPERATOR: Gear 8 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521929.05 — Gear 7 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 521929.06 — Gear 7 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 521929.07 — Gear 7 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 521929.12 — INFORMATION FOR OPERATOR: Gear 7 Jumped Out
The gear jumped out. Engage the gear again.

GPM 521929.17 — Time-Out When Engaging Gear 7
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 521929.18 — INFORMATION FOR OPERATOR: Gear 7 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521930.05 — Gear 6 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 521930.06 — Gear 6 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 521930.07 — Gear 6 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 521930.12 — INFORMATION FOR OPERATOR: Gear 6 Jumped Out
The gear jumped out. Engage the gear again.

GPM 521930.17 — Time-Out When Engaging Gear 6
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 521930.18 — INFORMATION FOR OPERATOR: Gear 6 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521931.05 — Gear 5 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 521931.06 — Gear 5 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 521931.07 — Gear 5 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 521931.12 — INFORMATION FOR OPERATOR: Gear 5 Jumped Out
The gear jumped out. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521931.17 — Time-Out When Engaging Gear 5
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 521931.18 — INFORMATION FOR OPERATOR: Gear 5 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521933.05 — Gear 4 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 521933.06 — Gear 4 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 521933.07 — Gear 4 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 521933.12 — INFORMATION FOR OPERATOR: Gear 4 Jumped Out
The gear jumped out. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521933.17 — Time-Out When Engaging Gear 4
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 521933.18 — INFORMATION FOR OPERATOR: Gear 4 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521935.12 — INFORMATION FOR OPERATOR: Range A Jumped Out
The range jumped out. Engage the range again.
Reaction of the control software: Limited or no function of the transmission.

GPM 521991.06 — Control Unit for Gear Shifting, Current Too High
Overall current strength of solenoid coils is too high. Control unit is in cooling phase. Gear shifting is not possible until 30 seconds have elapsed.
Reaction of the control software : The gears cannot be shifted.

GPM 521991.12 — Control Unit for Gear Shifting, Temperature Too High
The diagnostic trouble code is generated if the control software detects that the temperature of the control unit for gear shifting is too high. This may occur if an extremely high number of shifts are performed in a short period of time.
Reaction of the control software : The gears cannot be shifted.

GPM 522089.05 — Gear 1 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 522089.06 — Gear 1 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 522089.07 — Gear 1 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 522089.12 — INFORMATION FOR OPERATOR: Gear 1 Jumped Out
The gear jumped out. Engage the gear again.

GPM 522089.17 — Time-Out When Engaging Gear 1
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 522089.18 — INFORMATION FOR OPERATOR: Gear 1 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 522090.05 — Gear 2 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 522090.06 — Gear 2 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 522090.07 — Gear 2 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 522090.12 — INFORMATION FOR OPERATOR: Gear 2 Jumped Out
The gear jumped out. Engage the gear again.

GPM 522090.17 — Time-Out When Engaging Gear 2
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 522090.18 — INFORMATION FOR OPERATOR: Gear 2 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 522092.05 — Gear 3 Solenoid Current Too Low
This diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too low. This may indicate an open circuit.

GPM 522092.06 — Gear 3 Solenoid Current Too High
The diagnostic trouble code is generated if the control software detects that the current value at the solenoid is too high. This may indicate a shorted circuit.

GPM 522092.07 — Gear 3 Fault
The diagnostic trouble code is generated if the control software detects that after several attempts the gear cannot be engaged. This indicates a mechanical problem. The gear is disabled until the next tractor start-up.
Reaction of the control software: Limited or no function of the transmission.

GPM 522092.12 — INFORMATION FOR OPERATOR: Gear 3 Jumped Out
The gear jumped out. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 522092.17 — Time-Out When Engaging Gear 3
This diagnostic trouble code is generated if the control software detects that it takes too long to engage the gear. The second attempt to engage the gear takes place automatically.

GPM 522092.18 — INFORMATION FOR OPERATOR: Gear 3 Cannot Be Engaged
The second attempt to engage the gear has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. Engage the gear again.
Reaction of the control software: Limited or no function of the transmission.

GPM 522191.07 — Side Shaft 2 Fault
The diagnostic trouble code is generated if the control software detects that the gear cannot be engaged. Possibly, the previous gear (on the same shaft) is stuck after shifting the transmission. This indicates a mechanical problem with the side shaft.
Reaction of the control software: Limited or no function of the transmission.

GPM 522192.07 — Side Shaft 1 Fault
The diagnostic trouble code is generated if the control software detects that the gear cannot be engaged. Possibly, the previous gear (on the same shaft) is stuck after shifting the transmission. This indicates a mechanical problem with the side shaft.
Reaction of the control software: Limited or no function of the transmission.

GPM 524277.00 — INFORMATION FOR OPERATOR: Reduce Engine Speed To Allow Downshifting
To prevent engine damage and for safety reasons, actuate the brakes to reduce the engine speed. The gear cannot be engaged since the engine speed would be too high.