OBD-II code · Powertrain (generic, extended)
P28EF Engine Disconnect Clutch Actuator Performance/Stuck Off
The engine disconnect clutch actuator is commanded to engage but does not produce the expected motion. Actuator stuck in disengaged position.
Is it safe to drive with P28EF?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyActuator mechanically stuck off
- PossibleHydraulic engagement pressure lost
- Less likelyCarbon or debris buildup preventing free movement
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–9 h
- Emissions test
- Usually unaffected
- Parts involved
- Engine Disconnect Clutch Actuator, Hybrid Control Module
Related codes
- P28ECShift Motor Position Sensor Exceeded Learning Limit
- P28EDElectric/Auxiliary Transmission Fluid Pump B Overspeed
- P28EEElectric/Auxiliary Transmission Fluid Pump B Underspeed
- P28F0Engine Disconnect Clutch Actuator Stuck On
- P28F1Engine Disconnect Clutch Pressure Sensor Circuit
- P28F2Engine Disconnect Clutch Pressure Sensor Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.