Unexpected Mechanical Gear Disengagement
The transmission disengaged mechanically without a corresponding command. The vehicle can free-wheel, which is a safety concern. Often a hydraulic or hardware fault inside the gearbox.
Affected components
- Transmission internal
- Hydraulic control unit
Common causes
- High likelihood: Clutch piston seal failure releases gear
- Medium likelihood: Sudden hydraulic pressure loss
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
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.