Excessive Clutch A Slippage
The TCM detects more slip across clutch A (the first clutch in dual-clutch boxes, or the launch clutch in automated-manual systems) than the calibration allows. Heat builds up rapidly — risk of glazing the friction discs or warping the pressure plate.
Affected components
- Clutch a
Common causes
- High likelihood: Worn clutch A friction disc
- Medium likelihood: Low clamp force from aged actuator
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.