EPC 000177.04 – B60 Sensor for Transmission Oil Temperature, Voltage Too Low

EPC 000177.04 (EPC 177.04)

Code: 000177.04

Shortcode: 177.04


This error code, EPC 000177.04, indicates that the control unit has detected a voltage that is too low at the signal input of the transmission oil temperature sensor (lead 6002). This typically means the temperature value is above 125°C (257°F), suggesting a short to ground in the sensor circuit.


When this error is detected, the control unit may not accurately monitor the transmission oil temperature, which can lead to improper transmission operation and potential damage due to overheating.


Inspect Sensor Wiring:

  • Check the wiring associated with the transmission oil temperature sensor (B60) for any signs of shorts to ground. Repair or replace any damaged wiring.

Test Sensor Functionality:

  • Use diagnostic tools to test the transmission oil temperature sensor. Replace the sensor if it is found to be faulty.

Verify Connections:

  • Ensure all connectors and terminals in the sensor circuit are secure and free of corrosion. Repair or replace any faulty connections.

Check for Ground Faults:

  • Use a multimeter to check for ground faults in the sensor circuit. Resolve any detected faults.

Reset and Test System:

  • After addressing the issues, reset the system and monitor the transmission oil temperature readings to ensure they are accurate.


Ensuring the integrity of sensor wiring and connections is crucial for accurate temperature monitoring and proper transmission operation. Regular checks can help prevent such issues and ensure reliable performance.

Control Units: John Deere

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