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.
The engine disconnect clutch actuator is commanded to engage but does not produce the expected motion. Actuator stuck in disengaged position.
Common causes
- high
Actuator mechanically stuck off
One of the most commonly reported causes for this code — check this first.
Typical part cost: $550-3080
- medium
Hydraulic engagement pressure lost
A plausible cause — test and verify before replacing parts.
Typical part cost: $550-3080
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P28EF mean?
P28EF means "Engine Disconnect Clutch Actuator Performance/Stuck Off". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P28EF?
actuator mechanically stuck off; hydraulic engagement pressure lost; carbon or debris buildup preventing free movement — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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