P25EASupercharger Disconnect Clutch Stuck Closed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Here the clutch between pulley and supercharger rotors stays engaged although the engine computer wants the blower uncoupled, for example at idle or steady cruising. The blower then keeps turning, costs drive power and fuel, and its air has to be routed past it. Audi documents P25EA00 on the 2017–2019 Q7 with the 3.0 TFSI (engine code CREC): bulletin 2048402 reports the lamp on with this code stored in the engine module J623 and prescribes an engine software update with improved diagnostics, explicitly without replacing parts for this fault. A genuinely seized or welded clutch is still possible on other cars. The reverse case, a clutch that will not engage, is P25E9. Drivers mainly see the warning lamp and slightly higher consumption.
- What you may notice
- Check engine lamp on
- Higher fuel consumption at part load
- Supercharger whine also at idle or cruising
- Likely causes
- LikelyEngine control software misjudging the clutch state (Audi Q7 3.0 TFSI, bulletin 2048402)
- PossibleClutch plates stuck together by wear debris, corrosion or overheating
- RareClutch coil kept energised by a wiring fault or a stuck driver stage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.