BCU 002040.09 – Incorrect CAN Bus Message from DTI. John Deere System Advisory.

BCU 002040.09 (BCU 2040.09)

Code: 002040.09

Shortcode: 2040.09


Error code BCU 002040.09 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects issues in data transmission from the Drive Train Interface (DTI). This diagnostic trouble code indicates that the reception of one or more CAN bus messages from the DTI is intermittent or completely absent, potentially due to issues like loose wiring, faulty connections, or other disruptions within the CAN bus system.


The BCU may signal this fault by activating warning indicators on the dashboard, which may inform the operator of potential issues with drive train data communication. Depending on the nature of the missed messages, various drive train functions might be affected, impacting vehicle performance and potentially leading to operational inefficiencies.


  • Inspect CAN Bus Wiring and Connections: Check all wiring and connections involved in the CAN bus system between the BCU and DTI for signs of damage, wear, or looseness. Ensure that all connections are secure and intact.
  • Test CAN Bus Communication: Utilize diagnostic tools to assess the continuity and integrity of the communication between the BCU and DTI. Look for interruptions or errors in the data flow that could indicate the source of the problem.
  • Repair or Replace Faulty Wiring or Connectors: If any issues are identified during the inspection, repair or replace the affected wiring or connectors to restore stable and reliable communication.
  • Ensure DTI Functionality: Verify that the DTI is functioning correctly and not contributing to the problem by sending incorrect or incomplete data. Consider reprogramming or replacing the DTI if it is found to be faulty.
  • Reset the BCU and Clear Diagnostic Codes: After making necessary repairs or adjustments, reset the BCU to clear any stored error codes and reinitialize the system settings. This helps ensure that all components are communicating properly without further interruptions.
  • Monitor System Performance: After the repair, continue to monitor the system to ensure stable and consistent communication. Pay particular attention to the vehicle’s performance to confirm that all systems are responsive and operating as expected.


Maintaining reliable communication between the BCU and DTI is crucial for ensuring the correct operation of the vehicle’s drive train. Regular checks and maintenance of the CAN bus system and related electronic components are vital to prevent communication failures and ensure that the equipment operates smoothly and efficiently. Addressing CAN bus communication issues promptly minimizes downtime and helps maintain operational efficiency and vehicle safety.