Speed Request Communication Error

Communication error in the speed request between the unit controller and the engine ECU.

Possible causes

J1939 CAN data bus failure
Loose or corroded ECU connectors
Excessive electromagnetic interference
Internal main controller failure

Recommended actions

Verify CAN bus wiring integrity
Clean and tighten ECU connectors
Confirm controller software is up to date
Monitor if error persists after a power cycle

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