Description:

Error code BCU 002155.09 is activated when the Basic Control Unit (BCU) of a John Deere vehicle detects a communication fault with the power module PC5, which is responsible for the transmission system. This diagnostic trouble code indicates that the BCU is experiencing intermittent or nonexistent reception of one or more CAN bus messages from the transmission’s power module PC5. Possible causes include loose wiring, faulty connections, or disruptions within the CAN bus network.

Reaction:

Upon detection of this communication error, the BCU may initiate warnings on the operator’s dashboard and could restrict or modify transmission functions to prevent damage or operational hazards due to unreliable data communication.

Recommendations:

• Inspect CAN Bus Wiring and Connections: Carefully examine all wiring and connections in the CAN bus system between the BCU and power module PC5. Look for loose, damaged, or corroded connections that might be causing intermittent communication.
• Test CAN Bus Communication: Use diagnostic tools to evaluate the integrity of the communication links between the BCU and power module PC5. Identify any specific areas where data transmission errors occur.
• Repair or Replace Faulty Wiring or Connectors: Address any identified issues with the wiring or connectors by repairing or replacing them to ensure a stable and secure connection.
• Check Power Module PC5 Functionality: Verify that power module PC5 is functioning properly and not contributing to the problem by sending incorrect or incomplete data. Consider reprogramming or replacing the module if it is found to be defective.
• Reset the BCU and Clear Diagnostic Codes: After resolving any hardware or connection issues, reset the BCU to clear any stored error codes and reinitialize the system settings. This step will help ensure that all components are communicating correctly without further interruptions.
• Monitor System Operation: Continue monitoring the system after the repairs to ensure stable and consistent communication. Pay particular attention to the performance of the transmission to confirm that all functions are responsive and operating as expected.

Note:

Reliable communication between the BCU and the transmission’s power module is critical for optimal vehicle performance and safety. Regular maintenance of the CAN bus system and prompt attention to communication issues are essential to ensure the machinery operates efficiently and effectively. Addressing these issues quickly helps minimize downtime and maintain operational efficiency.