Description:

This error code, XSC 000639.12, indicates that the vehicle’s CAN Bus (500 kBd) is experiencing a high error rate. The control software is unable to process all CAN Bus messages received, which may be due to CAN Bus overload or an internal control software fault.

Reaction:

When this fault occurs, the control software will have limited or no functionality, disrupting the communication between various electronic control units (ECUs) and affecting the overall vehicle operation.

Recommendations:

Inspect CAN Bus Network:

• Check the CAN Bus wiring and connectors for any signs of damage, loose connections, or corrosion.
• Ensure all connections are secure and properly terminated.

Monitor CAN Bus Traffic:

• Use diagnostic tools to monitor CAN Bus traffic and identify any anomalies or excessive message loads.
• Ensure that the CAN Bus network is not overloaded with unnecessary messages.

Test Terminating Resistor:

• Inspect the terminating resistor within the CAN Bus network to confirm it is functioning correctly.
• Replace the terminating resistor if it is found to be defective or out of specification.

Update Control Software:

• Check for any available updates for the control software to address potential bugs or compatibility issues.

Consult Technical Support:

• If the issue persists, contact John Deere technical support for further diagnostics and solutions.
• Provide detailed logs of CAN Bus activity and any steps already taken to address the fault.

Note:

Maintaining a properly functioning CAN Bus network is crucial for effective communication and operation of the vehicle’s electronic systems. Regular inspections and maintenance of CAN Bus components can help prevent such faults.