U0100Lost Communication with ECM/PCM
The vehicle modules cannot communicate with the main engine computer.
This code also has a manufacturer-specific definition:
Can I keep driving? NO
STOP the vehicle in a safe place. Continuing to drive may cause serious engine damage or put your safety at risk.
Sistema Afectado
Red CAN · Comunicación entre módulos
Falla de comunicación en la red CAN: pérdida de datos entre las unidades de control (ECU).
Espacio para vendedores de repuestos
Aún no hay un anunciante en este espacio.
Symptoms You Will Notice
What you may observe when this code appears
- Multiple warning lights
- Vehicle does not start
- Several systems not responding
Possible Causes
The components or conditions that trigger this code
- 1Faulty main ECU
- 2CAN communication bus problems
- 3Blown fuse
- 4Damaged network wiring
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Check ECU-related fuses
- 2Check the computer power supply
- 3Inspect the CAN bus wiring
- 4Take it to a shop with advanced diagnostic equipment
Note: This information is for general reference. For precise diagnostics and safety repairs, always consult a certified mechanic.
Estimated Cost
Approximate range in USD (varies by region and shop)
Communication modules
* Diagnosis only: $50–$150
Quick Info
Dig Deeper
Videos, images and service manuals
Have Another Code?
Look it up directly: