SSU 000639.14 – Vehicle CAN BUS, Incorrect Message

SSU 000639.14 (SSU 639.14)

Code: 000639.14

Shortcode: 639.14


This diagnostic trouble code (DTC), SSU 000639.14, is generated when the control unit receives too many incorrect CAN BUS messages or detects a general problem in the connection to the vehicle CAN BUS. This indicates a communication issue with a significant number of incorrect messages on the CAN BUS network.


When this error is detected, the equipment may experience communication errors, leading to reduced functionality or incorrect operation of systems dependent on CAN BUS communication.


Verify CAN BUS Integrity:

  • Inspect the CAN BUS wiring and connectors for any signs of damage, loose connections, or corrosion.
  • Use diagnostic tools to check for continuity and proper voltage levels in the CAN BUS lines.

Check for Interference:

  • Ensure that there are no sources of electrical interference near the CAN BUS wiring that could be causing errors.
  • Verify proper shielding and grounding of the CAN BUS network.

Update Software:

  • Ensure that all related system software is up-to-date. Apply any available firmware updates to improve CAN BUS communication protocols.

Replace Faulty Components:

  • If any components within the CAN BUS network are found to be defective, replace them with new, genuine parts.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance in identifying and resolving the issue.


  • Regular maintenance and inspection of the CAN BUS wiring and connected components can help prevent the occurrence of incorrect messages.
  • Keeping the system firmware up-to-date ensures compatibility and reliability of the vehicle’s communication systems.

Control Units: John Deere

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