Fault in a serial communication (data bus) link between control modules.
SYMPTOMS
- Check-engine light
- Multiple unrelated codes
- Warning lights
LIKELY CAUSES
- CAN/data bus wiring fault
- Failed module
- Connector/ground fault
DIAGNOSIS STEPS
- Scan all modules for communication faults
- Check bus wiring and terminations
- Inspect grounds and connectors
RELATED PARTS
- Wiring harness
- Control module