Powertrain, generic (extended)

P25ED Supercharger Disconnect Clutch Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Control wire shorted to battery voltage
Open clutch coil or broken wire on a ground-switched circuit
Output stage in the engine control module damaged

Symptoms

  • Check engine lamp on
  • Sluggish pull-away, supercharger does not cut in

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

supercharger clutchclutch solenoidwiring harness

Related codes

P25EBP25ECP25FEP25E9

References: law.cornell.edu, mobilityengineeringtech.com, en.wikipedia.org.