U0101Lost Communication with TCM
The engine computer cannot communicate with the transmission control module.
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
- Transmission in limp mode
- Erratic shifting
- Transmission light on
Possible Causes
The components or conditions that trigger this code
- 1Faulty TCM module
- 2CAN communication problems
- 3Damaged wiring
- 4Blown fuse
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Check the TCM fuses
- 2Inspect the module connectors
- 3Diagnose the CAN bus
- 4Test the TCM module
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: