Transmission Control System Range/Performance
The TCM has detected a transmission performance issue without identifying a specific component fault — typically slip outside expected range, shift timing outside spec, or a hydraulic issue not yet diagnosed by a more specific code.
Affected components
- Tcm
- Transmission valve body
- Transmission fluid
Common causes
- High likelihood: Transmission fluid low or burnt
- Medium likelihood: Valve body wear
- Low likelihood: Sensor element aged beyond calibration window
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
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.