U0100 — Lost Communication With ECM/PCM
Reviewed1 source
1 source
- Official data (NHTSA)official_feed
What U0100 means
Avoid long trips
Another control module on the vehicle reports losing communication with the main engine control module over the CAN bus — a network-level fault, not a specific component failure.
Driveability assessment not yet available. Get a personalized AI Second Opinion for your exact car.
General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Damaged CAN bus wiring
Symptoms
- Повышенный расход топлива
- Erratic behavior across several systems at once
- Multiple warning lights at once
Cost data coming soonUpload your estimate to check if the price is fair