What does code P28EF mean?

Q: What does code P28EF mean?

Engine Disconnect Clutch Actuator Performance/Stuck Off. P28EF indicates that the powertrain control module (PCM) has detected a performance fault or stuck-off condition in the engine disconnect clutch actuator circuit. The engine disconnect clutch, used in some hybrid and automatic-start-stop systems, physically decouples the engine from the drivetrain; the PCM commands the actuator and monitors its response, and when the actuator fails to move or stays in the disengaged position when engagement is requested, this code is stored.

DTC codes / P28xx · Transmission / P28EF

P28EFEngine Disconnect Clutch Actuator Performance/Stuck Off

P28EF indicates that the powertrain control module (PCM) has detected a performance fault or stuck-off condition in the engine disconnect clutch actuator circuit. The engine disconnect clutch, used in some hybrid and automatic-start-stop systems, physically decouples the engine from the drivetrain; the PCM commands the actuator and monitors its response, and when the actuator fails to move or stays in the disengaged position when engagement is requested, this code is stored.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.