Powertrain, generic (extended)

P28D1 Clutch A Motor Driver Current/Temperature Too High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P28D1 is set when the power stage that drives the clutch A motor exceeds its current limit or its internal temperature limit. This output stage, usually part of the transmission controller or the actuator electronics, protects itself by shutting down or derating, after which clutch A can no longer be operated normally. Overcurrent typically follows a motor that is hard to turn, such as a pump jammed by debris as Stellantis describes for the 7HDT300 actuator, or a shorted winding. Overheating also results from long periods of high pressure demand, for instance creeping in traffic or hill holds, and from a hot clutch already flagged by P2787. Phase circuit faults are P28C4-P28C6. No manufacturer publishes P28D1 thresholds.

Likely causes

Clutch A motor or pump hard to turn, e.g. jammed by particles
Long periods of high clutch pressure demand in stop-and-go or on gradients
Shorted motor winding drawing excess current

Symptoms

  • Transmission warning after heavy use, may clear after cooling down
  • Clutch A temporarily disabled
  • Possibly stored together with clutch temperature code P2787

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time0.5–4 h

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

Parts involved

clutch motor awiring harnesstcm

Related codes

P28C4P28C7P28CAP2787P28D6

References: law.cornell.edu, cti-symposium.world, static.nhtsa.gov.