Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / EF
Possible causes
- Actuator mechanically stuck off high
- Hydraulic engagement pressure lost medium
- Carbon or debris buildup preventing free movement low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 500–2800 €
- Estimated time: 2–9 h
- Component: engine disconnect clutch actuator
- Component: hybrid control module
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012