BCU 002000.09 – Incorrect CAN Bus Message from ECU. John Deere System Advisory.

BCU 002000.09 (BCU 2000.09)

Code: 002000.09

Shortcode: 2000.09


Error code BCU 002000.09 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle experiences a data transfer problem with the Engine Control Unit (ECU). This issue may manifest as intermittent or nonexistent reception of one or more CAN bus messages transmitted by the ECU. Such disruptions can be attributed to potential issues like loose wiring, damaged connectors, or faults within the CAN bus system itself, impacting communication between these critical components.


The BCU may respond by logging this error and potentially displaying a warning indicator to the operator. Depending on the nature of the missed messages, various engine management functions might operate suboptimally or fail to engage, affecting vehicle performance and potentially leading to increased emissions or reduced efficiency.


  • Inspect CAN Bus Wiring and Connectors: Thoroughly check all related wiring and connectors between the BCU and ECU for looseness, corrosion, or damage. Ensure that all connections are secure and intact.
  • Test CAN Bus Communication: Utilize diagnostic tools to monitor and test the CAN bus communication between the BCU and ECU. Look for inconsistencies or interruptions in the data flow that could indicate where the problem is occurring.
  • Replace or Repair Faulty Wiring: If any issues with the wiring or connectors are identified, repair or replace them to restore proper communication pathways.
  • Check ECU Functionality: Ensure that the ECU is functioning properly and not sending corrupt or erroneous data. Consider reprogramming or replacing the ECU if it is found to be the source of the problem.
  • Reset the BCU and Clear Diagnostic Codes: After addressing the issues, reset the BCU to clear any stored error codes and retest the system to ensure that communication has been restored and is operating consistently.
  • Monitor System Performance: Following the repair, continue to monitor the system to ensure no further communication issues arise and that the vehicle’s performance has returned to normal.


Maintaining robust and reliable communication across vehicle control systems is essential for the safe and efficient operation of modern machinery. Regular checks and maintenance of the CAN bus system and associated electronics are crucial to prevent communication failures and ensure that the equipment operates smoothly. Addressing communication issues promptly minimizes downtime and helps maintain operational efficiency.