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TCU codes

Comprehensive Guide to John Deere TCU Fault Codes and Diagnostic Trouble Codes

Understanding John Deere TCU fault codes is essential for maintaining the optimal performance of your equipment. These codes help identify specific issues within the Transmission Control Unit (TCU), allowing for timely and accurate troubleshooting. Below are some of the most common John Deere TCU diagnostic trouble codes, their meanings, and where they typically occur.

Common John Deere TCU Fault Codes

TCU 000126.00 – Dirty Transmission Oil Filter
- Description: This code is generated when dirt is detected in the transmission oil filter.
- Location: Transmission system.
- Impact: Can cause reduced transmission efficiency and potential overheating.
TCU 000127.01 – Transmission Oil Pressure Too Low
- Description: Indicates that the control unit does not register any transmission oil pressure.
- Location: Transmission system.
- Impact: May lead to improper transmission functioning and potential damage.
TCU 000161.00 – Transmission Input Speed Too High
- Description: Triggered when the transmission input speed exceeds the maximum RPM.
- Location: Engine and transmission interface.
- Impact: Can cause severe wear and tear on transmission components.
TCU 000177.00 – Transmission Oil Temperature Very High
- Description: This code is generated when the transmission oil temperature exceeds 100°C (212°F).
- Location: Transmission system.
- Impact: High oil temperature can lead to transmission failure and reduced lifespan.
TCU 600006.31 – Diagnostic Trouble Code Not Known
- Description: Indicates the presence of an unknown diagnostic trouble code received via CAN BUS.
- Location: CommandCenter (DTI).
- Impact: Can complicate diagnostics and troubleshooting processes.

Importance of Addressing John Deere TCU Error Codes

Timely addressing John Deere TCU error codes is crucial for the following reasons:

Prevents Further Damage: Early detection and resolution of TCU fault codes can prevent more significant issues and expensive repairs.
Ensures Optimal Performance: Keeping the transmission system in good condition ensures the overall efficiency and performance of the equipment.
Safety: Proper functioning of the transmission system is essential for the safe operation of John Deere machinery.

Regular monitoring and addressing of John Deere TCU diagnostic trouble codes is vital for the longevity and performance of your equipment. By understanding these common error codes and their implications, you can maintain your John Deere machinery more effectively, ensuring it operates smoothly and safely.

TCU 002000.09 – Incorrect CAN BUS Message, Information from ECU
John Deere TCU codes
This diagnostic trouble code (TCU 002000.09) is generated when a data transfer problem occurs between the ECU and TCU. Specifically, the reception of CAN messages regarding engine load and engine speed from the ECU control unit is intermittent or nonexistent,…
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TCU 000630.13 – Control Unit Not Calibrated
John Deere TCU codes
This diagnostic trouble code (TCU 000630.13) is generated if the TCU 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…
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TCU 000604.03 – Transmission Enable Signal, Voltage Too High
John Deere TCU codes
This diagnostic trouble code (TCU 000604.03) is generated when the control unit detects a short to a positive lead at the transmission enable signal (neutral signal, lead 6064) during the initialization process (control unit boot sequence after the ignition is…
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TCU 000604.02 – Transmission Enable Signal Faulty
John Deere TCU codes
This diagnostic trouble code (TCU 000604.02) is generated when the transmission enable signal (neutral signal, lead 6064) from the transmission enable relay (K06/03 or K02/03) does not match the position of the reverse drive lever (transmitted by the UIC control…
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TCU 000598.03 – S72 Clutch Pedal Switch, Voltage Too High
John Deere TCU codes
This diagnostic trouble code (TCU 000598.03) is generated when the control unit detects a short to a positive lead at the signal lead of the clutch pedal switch (S72, lead 6046) during the initialization process (control unit boot sequence after…
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TCU 000598.02 – S72 Clutch Pedal Switch, Fault
John Deere TCU codes
This diagnostic trouble code (TCU 000598.02) is generated if the position of the clutch pedal switch does not correspond to the position of the clutch pedal. This discrepancy is detected when the voltage of the clutch pedal potentiometer, transmitted as…
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TCU 000237.31 – VIN Information, Incorrect
John Deere TCU codes
This diagnostic trouble code (TCU 000237.31) is generated when the vehicle identification number (VIN) from the UIC control unit is not received or incorrectly received. This indicates a problem with the transmission or reception of VIN data.
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TCU 000237.02 – VIN Information, Mismatch
John Deere TCU codes
This diagnostic trouble code (TCU 000237.02) is generated if the vehicle identification number (VIN) of the UIC control unit does not match the tractor type in address TCU044. This indicates a mismatch between the stored VIN information and the tractor…
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TCU 000191.11 – B63 Sensor for Transmission Output Speed, Signal does Not Match the Signal from the PLC
John Deere TCU codes
This diagnostic trouble code (TCU 000191.11) is generated if there is a frequency discrepancy between the signal from the transmission output speed sensor (B63) and the amplified signal from the wheel speed sensor (B84). This discrepancy indicates a potential issue…
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TCU 000191.08 – B63 Sensor for Transmission Output Speed, Speed in Channel 1 Lower than in Channel 2
John Deere TCU codes
This diagnostic trouble code (TCU 000191.08) is generated if a frequency discrepancy is detected between the two sensor output signals for transmission output speed. This indicates that the speed in channel 1 is lower than in channel 2, suggesting a…
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TCU 000191.04 – B63 Sensor for Transmission Output Speed, Voltage at Channel 1 Too Low
John Deere TCU codes
This diagnostic trouble code (TCU 000191.04) is generated if the control unit detects that the voltage at the signal input from channel 1 of the transmission output speed sensor (B63, lead 6081) is too low. This typically indicates a short…
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John Deere News & Innovations: Equipment, Technology, Solutions

TCU codes

Comprehensive Guide to John Deere TCU Fault Codes and Diagnostic Trouble Codes

Common John Deere TCU Fault Codes

Importance of Addressing John Deere TCU Error Codes

TCU 002000.09 – Incorrect CAN BUS Message, Information from ECU

TCU 000630.13 – Control Unit Not Calibrated

TCU 000604.03 – Transmission Enable Signal, Voltage Too High

TCU 000604.02 – Transmission Enable Signal Faulty

TCU 000598.03 – S72 Clutch Pedal Switch, Voltage Too High

TCU 000598.02 – S72 Clutch Pedal Switch, Fault

TCU 000237.31 – VIN Information, Incorrect

TCU 000237.02 – VIN Information, Mismatch

TCU 000191.11 – B63 Sensor for Transmission Output Speed, Signal does Not Match the Signal from the PLC

TCU 000191.08 – B63 Sensor for Transmission Output Speed, Speed in Channel 1 Lower than in Channel 2

TCU 000191.04 – B63 Sensor for Transmission Output Speed, Voltage at Channel 1 Too Low

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