Diagnostic Trouble Code
U0100 — Lost Communication with ECM/PCM
Lost Communication with ECM/PCM
Definition
Communication has been lost between the body control module or other module and the Engine Control Module (ECM) / Powertrain Control Module (PCM) on the CAN bus network. This is a network communication fault, not an engine fault.
Common Causes
- Faulty ECM/PCM
- CAN bus wiring open or shorted
- Corroded CAN bus connector
- Blown fuse powering the ECM
- Water intrusion into ECM or wiring harness