P25EC code meaning
Supercharger Disconnect Clutch Circuit Low
Powertrain system Generic code P25xx codes Check engine light
What P25EC means
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.
P25EC at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P25EC
- Check engine lamp on
- Supercharger permanently engaged or permanently off, depending on circuit design
- Reduced power at low engine speed
Common causes of P25EC
- Most likelyControl wire shorted to ground, often chafed on brackets or the engine block
- PossibleClutch coil shorted internally
- Less likelyFaulty output stage in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Supercharger clutchClutch solenoidWiring harness
What each part of P25EC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| EC | The exact fault in that area. |
What to do next
- Note P25EC and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P25EC
What does P25EC mean?
P25EC means "Supercharger Disconnect Clutch Circuit Low". The engine module measures a voltage on the supercharger clutch control line that is lower than expected for the commanded state. It is a generic code, so it means the same on every make.
Is it safe to drive with P25EC?
Drive gently and only to a workshop. With P25EC the car can go into limp mode (reduced power) to protect itself.
Will P25EC fail an emissions test?
Yes, it can. P25EC is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P25EC to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P25EC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.