TCM Request Forced Engine Shutdown
The transmission control module (TCM) has requested an emergency engine shutdown over the powertrain bus, typically because it has detected a condition that could damage the gearbox or driveline if engine torque were not removed (e.g. severe overheating, loss of pressure or hydraulic control).
Affected components
- Tcm
- Powertrain bus
- Ecm
Common causes
- High likelihood: TCM internal protection logic triggered by gearbox condition
- Low likelihood: Invalid or stuck shutdown message on powertrain bus
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.