John Deere 000923.09 – ATC: M07/M10 - Fan Motor, Incorrect CAN BUS Message from ATC (Power Module (HF) PC6)

This error code indicates a data transfer problem between the Power Module (HF) PC6 and the ATC (Automatic Temperature Control) control unit regarding the HVAC fan motors (M07 and M10). The reception of one, several, or all of the CAN messages transmitted by the ATC to the power module is intermittent or nonexistent. This faulty communication can lead to improper operation or total failure of the fan motors, affecting the cooling efficiency of the system.

• 6230
• 6330
• 6430
• 7130
• 7230
• 7330
• 7430
• 7530

1. 1

   Visually and physically inspect all CAN BUS connections between the ATC control unit and the Power Module (HF) PC6 for looseness, corrosion, or physical damage (intermittent reception is most often due to a loose wire).

2. 2

   Use John Deere Service ADVISOR to analyze the integrity and functionality of the CAN BUS network.

3. 3

   Check for related diagnostic trouble codes from other control units (e.g., BCU 002354.09, BCU 002386.09, BCU 523691.09, or BIF 522426.09). If present, the power module (HF) PC6 takes priority for diagnosis.

4. 4

   Perform a CAN BUS Check via CommandCenter (DTI) to verify module visibility on the network.

1. 1

   Secure loose wiring

   Ensure all wiring harnesses between the ATC and PC6 are properly secured and making good contact.

2. 2

   Repair or replace wiring

   Tighten any loose connector pins and replace any damaged wires or connectors found during the visual inspection.

3. 3

   Reprogram or reset modules

   If the wiring is intact, reprogram or reset the affected modules (ATC and PC6). This ensures that all software settings are correct and that the modules can properly communicate.

4. 4

   Replace control modules

   If wiring is verified good and reprogramming fails to restore communication, the ATC Control Unit or the Power Module (HF) PC6 may have an internal fault and require replacement.