SSU 000177.09 – Incorrect CAN BUS Message, Hydraulic Oil Temperature from EPC or TCU

SSU 000177.09 (SSU 177.09)

Code: 000177.09

Shortcode: 177.09


This diagnostic trouble code (DTC), SSU 000177.09, is generated when the information on transmission oil temperature is not recognized on the CAN BUS after four attempts. AutoTrac requires the transmission oil temperature to be above 0°C to function, so this issue can disrupt AutoTrac operations.


When this error is detected, AutoTrac may not function correctly, leading to potential issues with vehicle guidance and operation.


Verify CAN BUS Communication:

  • Inspect the CAN BUS wiring and connectors for any signs of damage, loose connections, or corrosion.
  • Use diagnostic tools to check for continuity and proper voltage levels in the CAN BUS lines.

Check Temperature Sensor:

  • Ensure that the hydraulic oil temperature sensor is functioning properly and transmitting accurate data.

Update Software:

  • Ensure that the EPC, TCU, and BCU software are up-to-date. Update the software to include the latest diagnostic trouble codes and communication protocols.

Replace Faulty Components:

  • If any components within the CAN BUS network are found to be defective, replace them with new, genuine parts.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance in identifying and resolving the issue.


  • Regular maintenance and inspection of the CAN BUS wiring and connected components can help prevent this issue.
  • This code may sometimes be triggered by intermittent faults in the CAN BUS communication, so monitoring the system for any recurrence is crucial.

Control Units: John Deere

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