ATC 000923.09 – Fan Motor Incorrect CAN BUS Message. John Deere System Advisory.

ATC 000923.09 (ATC 923.09)

Code: 000923.09

Shortcode: 923.09


The error code, ATC 000923.09, indicates a problem with the data transfer between the power module (HF) PC6 and the ATC control unit regarding the fan motors (M07 and M10). Issues such as intermittent or nonexistent reception of one or more CAN messages can stem from loose wires or connectivity problems within the CAN BUS system. This faulty communication can lead to improper operation or failure to operate the fan motors as intended.


Due to the communication issues, the fan motors might not respond appropriately to control commands, which can affect the cooling efficiency of the system. This may lead to overheating of the engine or other critical components if the fans fail to activate or regulate speed as needed.


  • Inspect CAN BUS Connections: Check all CAN BUS connections, especially those between the ATC control unit and the power module (HF) PC6, for looseness, corrosion, or damage.
  • Test CAN BUS Integrity: Use diagnostic tools to analyze the integrity and functionality of the CAN BUS. Look for errors or poor connections that could disrupt communication.
  • Secure Loose Wiring: Ensure all wiring is properly secured and making good contact. Tighten any loose connections and replace damaged wires or connectors.
  • Reprogram or Reset Modules: Consider reprogramming or resetting the affected modules to ensure that all settings are correct and that the modules can properly communicate.
  • Monitor System Performance: After repairs, monitor the system performance to ensure that the CAN BUS messages are being transmitted and received without interruption and that the fan motors operate reliably under normal conditions.


Maintaining robust and reliable communication across control systems is crucial for the safe and efficient operation of machinery. Regular monitoring and maintenance of the CAN BUS and associated electronics are essential to prevent communication failures and ensure that the equipment operates smoothly. Addressing communication issues promptly is key to minimizing downtime and maintaining operational efficiency.