Powertrain
generic / SAE
P25EA
Supercharger Disconnect Clutch Stuck Closed
The clutch that engages the mechanical supercharger to the engine drive will not open. The supercharger remains coupled at all loads, increasing parasitic loss and fuel consumption when boost is not needed.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / EA
Possible causes
- Armature plate seized to the pulley face high
- Driver stuck on keeps clutch energised medium
- Failed pulley bearing welds clutch surfaces low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 2–6 h
- Component: supercharger clutch
- Component: clutch solenoid
- Component: clutch pulley
- MIL / check engine light
Sources
References
sae:J2012