Code result
P28EF
Engine Disconnect Clutch Actuator Performance/Stuck Off
High severity
What it means
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?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Actuator mechanically stuck off
highOne of the most commonly reported causes for this code — check this first.
Hydraulic engagement pressure lost
mediumA plausible cause — test and verify before replacing parts.
Carbon or debris buildup preventing free movement
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P28EF freeNo credit card required