SSU 000084.09 – Incorrect CAN BUS Message, Travel Speed from BCU

SSU 000084.09 (SSU 84.09)

Code: 000084.09

Shortcode: 84.09


This diagnostic trouble code (DTC), SSU 000084.09, is generated when no signal from the travel speed sending unit can be detected on the CAN BUS. This indicates an issue with the communication between the travel speed sending unit and the BCU (Body Control Unit).


When this error is detected, the equipment may not correctly display or process the travel speed data. This can lead to potential issues in vehicle operation and diagnostics.


Inspect Travel Speed Sending Unit:

  • Check the travel speed sending unit for any visible signs of damage or wear.
  • Ensure the unit is properly connected and mounted.

Verify CAN BUS Communication:

  • 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.

Update Software:

  • Ensure that the BCU software is up-to-date. Update the software to include the latest diagnostic trouble codes and communication protocols.

Replace Faulty Components:

  • If the travel speed sending unit or CAN BUS wiring is found to be defective, replace the faulty components 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 this issue.
  • Ensure that all software updates are applied promptly to maintain compatibility and reliability of the vehicle’s diagnostic systems.
  • This code may sometimes be triggered by intermittent faults in the CAN BUS communication, so monitoring the system for any recurrence is crucial.

Control Units: John Deere

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