BCU 002386.09 – E27 Beacon Light, Incorrect CAN Bus Message from BCU. John Deere System Advisory.

BCU 002386.09 (BCU 2386.09)

Code: 002386.09

Shortcode: 2386.09


Error code BCU 002386.09 is triggered when the Power Module (High Frequency) PC6 in a John Deere vehicle experiences difficulties in receiving CAN bus messages from the Basic Control Unit (BCU) specifically related to the E27 beacon light. This diagnostic trouble code points to problems such as intermittent or completely absent communication, which could be due to issues like loose wiring, faulty connections, or disruptions within the CAN bus network.


The system may signal this communication fault by activating warning indicators on the vehicle’s dashboard, potentially affecting the control and operation of the beacon light. This could lead to operational inconsistencies or failure to activate the beacon light when needed.


  • Inspect CAN Bus Wiring and Connections: Thoroughly check all wiring and connections involved in the CAN bus system between the BCU and PC6. Look for signs of damage, wear, or looseness that might be causing communication interruptions.
  • Test CAN Bus Communication: Use diagnostic tools to assess the continuity and integrity of the communication links between the BCU and PC6. Identify any specific areas or components where signal loss or errors occur.
  • Repair or Replace Faulty Wiring or Connectors: If any issues are discovered during the inspection, repair or replace the affected wiring or connectors to ensure stable and secure communication.
  • Check BCU and PC6 Functionality: Verify that both the BCU and PC6 are functioning properly and not contributing to the problem by sending or receiving erroneous data. Consider reprogramming or replacing components if they are found to be faulty.
  • Reset the BCU and Power Module and Clear Diagnostic Codes: After resolving any hardware or connection issues, reset both the BCU and power module PC6 to clear any stored error codes and reinitialize the system settings. This step ensures that all components are communicating properly without further interruptions.
  • Monitor System Performance: Continue monitoring the system after repairs to ensure that communication has been fully restored and that the beacon light is operating correctly. Verify that no further communication issues are observed.


Maintaining reliable communication between the BCU and the power module PC6 is crucial for ensuring proper operation of the vehicle’s beacon light. Regular maintenance of the CAN bus system and timely attention to communication discrepancies can help prevent operational issues and ensure that the vehicle continues to perform efficiently and safely. Addressing CAN bus communication issues promptly helps minimize downtime and maintain operational efficiency.