CRU 000639.14 – High Error Rate in Vehicle CAN Bus (500 kBd). John Deere System Advisory.

CRU 000639.14 (CRU 639.14)

Code: 000639.14

Shortcode: 639.14


Error code CRU 000639.14 signals a very high error rate in the Vehicle CAN Bus operating at 500 kBd, indicating a significant issue with data transmission within the vehicle’s network. This condition arises from too many incorrect CAN Bus messages being received, which may be due to connectivity problems, electrical interference, or hardware malfunctions in the network components.


Due to the high error rate, the control software’s functionality is severely restricted or completely disabled to prevent erroneous operations or further system damage.


  • Inspect CAN Bus Connections: Check all connections within the CAN Bus network for looseness, corrosion, or damage. Ensure that all connectors are secure and clean.
  • Test Network Integrity: Use specialized diagnostic tools to test the integrity and functionality of the CAN Bus. Look for disruptions in the network that could be causing the high error rates.
  • Identify and Resolve Electrical Interferences: Investigate for potential sources of electrical interference that could be affecting the CAN Bus signals. Shielding or rerouting wires might be necessary to minimize interference.
  • Replace Faulty Components: If specific components or sections of the wiring are identified as faulty, replace them to ensure reliable communication across the network.
  • Reset and Re-test the System: After addressing the issues, reset the control software and CAN Bus system. Conduct thorough testing to confirm that the error rate has returned to acceptable levels and that functionality is restored.


Maintaining a stable and error-free CAN Bus network is essential for the reliable operation of vehicle control systems. Regular monitoring and maintenance of the network can prevent high error rates and ensure that the vehicle’s electronic systems function optimally. Addressing CAN Bus issues promptly is key to minimizing downtime and enhancing the overall performance and safety of the equipment.

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