P28C8Clutch A Pump Motor Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P28C8 concerns the motor-and-pump unit of clutch A as a whole: the controller sees that the delivered result, typically the clutch pressure reported by the sensor or the motor effort needed to reach it, does not fit the command. In on-demand designs the gerotor pump is connected straight to the clutch cylinder, so pressure follows pump speed directly; a Hyundai-backed EVS32 study modelled exactly this arrangement and its energy saving. A pump clogged by particles, a worn gerotor set, internal leakage at the piston seals or low oil level make the pump work harder or fall short. No manufacturer documents P28C8 itself in public; Stellantis blames debris jamming the actuator pump for the related P28C7 on the 7HDT300.
- What you may notice
- Slipping or delayed engagement of clutch A
- Transmission warning, gears on clutch A may be locked out
- Audible whine from the actuator under load
- Likely causes
- LikelyClutch A pump obstructed by abrasion particles
- PossibleInternal leakage at the clutch A piston or pressure line seals
- PossibleWorn gerotor set reducing delivery
- RareLow transmission fluid level so the pump draws air
- 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: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.