Powertrain, generic (extended)

P25EB Supercharger Disconnect Clutch Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P25EB covers the electrical drive of the supercharger clutch when it is neither cleanly shorted nor open, yet the values do not fit the command – for example a coil current that is too small or too large for the applied duty cycle, or a signal that drops out briefly. According to Eaton, the clutch needs only a 12 V signal but is engaged with a modulated signal so that it bites smoothly, which gives the controller something to compare. Typical reasons are a coil with altered resistance, a corroded plug or a chafed wire. Hard faults to ground or voltage are reported separately as P25EC and P25ED. No carmaker documents this code publicly; the regulation behind it is CARB's rule for output components. The clutch may be switched off as a precaution.

Likely causes

Clutch coil whose resistance has changed through heat or partial winding short
Corroded or loose connector at the clutch or engine module
Wire chafed near the hot supercharger housing causing intermittent contact

Symptoms

  • Check engine lamp on
  • Jerky or missing supercharger engagement at low revs

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–2,500
Time0.5–5 h

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

Parts involved

supercharger clutchclutch solenoidwiring harness

Related codes

P25ECP25EDP25FEP25E9

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