Engine J1939 CAN Data Link Failed

Total communication failure on the engine J1939 data link.

Possible causes

Total break in CAN bus cables
Power supply failure to engine ECU
Short to ground or voltage on the CAN bus
Damaged main controller or ECU

Recommended actions

Search for physical breaks in the wiring harness
Verify power and ground at the ECU
Test CAN network with an analyzer or multimeter
Disconnect modules to identify which one is blocking the bus

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