U0100

U0100 00

ECM Missing on Bus







Fault symptom
- Messages shown in SID.

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Engine running and not in limp home mode.
- Voltage is over 9V but under 16V.

Fault criteria:
- The control module has no communication with ECM.

System reaction to a fault:
- Limp home

Checking the wiring harness
- Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:
- Electrical fault on bus leads or in the component.