P25ECSupercharger Disconnect Clutch Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The engine module measures a voltage on the supercharger clutch control line that is lower than expected for the commanded state. Most often the line has a short to ground. What that does depends on how the coil is switched: with a ground-side driver a grounded control wire can leave the coil permanently energised, so the blower keeps turning; with a supply-side driver the clutch simply stays off and the low-speed boost is gone. Neither the threshold nor a detection time has been published for this code, and no manufacturer documents it publicly; CARB requires output circuits to be checked for such faults. P25ED is the high-side counterpart, P25EB the plausibility fault. The control module usually disables clutch control.
- What you may notice
- Check engine lamp on
- Supercharger permanently engaged or permanently off, depending on circuit design
- Reduced power at low engine speed
- Likely causes
- LikelyControl wire shorted to ground, often chafed on brackets or the engine block
- PossibleClutch coil shorted internally
- RareFaulty output stage in the engine control module
- 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.