P28D1Clutch A Motor Driver Current/Temperature Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Transmission warning after heavy use, may clear after cooling down
- Clutch A temporarily disabled
- Possibly stored together with clutch temperature code P2787
- Likely causes
- LikelyClutch A motor or pump hard to turn, e.g. jammed by particles
- PossibleLong periods of high clutch pressure demand in stop-and-go or on gradients
- RareShorted motor winding drawing excess current
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.