ETC 000923.09 – M07/M10 Fan Motor, Incorrect CAN BUS Message from ETC (Power Module (HF) PC6)

ETC 000923.09 (ETC 923.09)

Code: 000923.09

Shortcode: 923.09


The error code ETC 000923.09 is generated when there is a problem transferring data between the power module (HF) PC6 and the ETC control unit. This fault indicates that reception of one, several, or all of the CAN messages transmitted by the ETC to the power module is intermittent or nonexistent, which could be due to a loose wire or other communication issues.


When this fault is detected, the control unit may limit or disable the fan motor operation to prevent malfunction due to unreliable communication. This can result in intermittent or complete loss of cooling functionality.


Inspect CAN BUS Network:

  • Check Wiring and Connections: Inspect all CAN BUS wiring and connectors between the ETC control unit and the power module (HF) PC6 for signs of damage, loose connections, or corrosion. Repair or replace any compromised wiring.
  • Measure Signal Integrity: Use diagnostic tools to measure the integrity of the CAN BUS signals. Look for signal degradation, interference, or intermittent connectivity.

Test and Replace Components:

  • Test CAN BUS Modules: Verify the operation of all CAN BUS modules involved in the communication. Replace any modules that are found to be malfunctioning or contributing to communication issues.
  • Inspect Power Module and Control Unit: Ensure that both the power module (HF) PC6 and the ETC control unit are functioning correctly. Replace any faulty components as necessary.

Update and Reconfigure:

  • Software Updates: Apply any available firmware or software updates to the control units and CAN BUS modules to ensure they are operating with the latest fixes and improvements.
  • Reconfigure Network: Reconfigure the CAN BUS network settings if necessary to optimize performance and reduce error rates.


Maintaining a reliable CAN BUS network is critical for vehicle operations. Regular inspections and timely repairs of the network components can help prevent communication errors and conflicts in control signals.

Control Units: John Deere

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