OBD-II code · Powertrain (generic, extended)
P25E9 Supercharger Disconnect Clutch Stuck Open
The clutch that engages the mechanical supercharger to the engine drive will not close. The supercharger stays disengaged so boost from this stage is unavailable, which limits torque and may also affect cooling pump drives shared with the same belt.
Is it safe to drive with P25E9?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyOpen electromagnetic clutch coil
- PossibleWorn friction surfaces leave the air gap too large to attract
- Less likelyCorroded armature plate stuck open
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Supercharger Clutch, Clutch Solenoid, Clutch Pulley
Related codes
- P25E6B Camshaft Position - Stuck In Locked Position Bank 2
- P25E7B Camshaft Position - Unable to Achieve Locked Position Bank 2
- P25E8B Camshaft Position Control Performance Bank 2
- P25EASupercharger Disconnect Clutch Stuck Closed
- P25EBSupercharger Disconnect Clutch Circuit Range/Performance
- P25ECSupercharger Disconnect Clutch Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.