P25EDSupercharger Disconnect Clutch Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P25ED the voltage on the clutch control line sits above the expected level. Common reasons are a wire shorted to battery voltage, or – on a ground-switched coil – an open coil or broken lead, because the line is then pulled up to supply voltage. A short to voltage can overload the driver stage, which protects itself by switching off. In practice the supercharger then stays uncoupled and only the turbocharger delivers boost, so the car feels sluggish from standstill. Volvo's twincharged T6 Drive-E and Audi's 3.0 TFSI are examples of engines with such a clutch, but neither has published this code. Thresholds are not public; CARB prescribes circuit checks for such outputs. Low-side faults are P25EC, implausible values P25EB.
- What you may notice
- Check engine lamp on
- Sluggish pull-away, supercharger does not cut in
- Likely causes
- LikelyControl wire shorted to battery voltage
- PossibleOpen clutch coil or broken wire on a ground-switched circuit
- RareOutput stage in the engine control module damaged
- 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: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.