Clutch B Unexpected Mechanical Gear Disengagement
Clutch B inside the dual-clutch transmission disengaged mechanically without a corresponding command.
Affected components
- Dual clutch b
- Hydraulic actuator
Common causes
- High likelihood: Clutch release piston seal failure
- Medium likelihood: Sudden hydraulic pressure loss
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
- Reduced-power or limp mode may occur
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.