What does code P28CA mean?

Q: What does code P28CA mean?

Clutch A Motor Underspeed. P28CA indicates that the transmission control module (TCM) or powertrain control module (PCM) has detected the electric motor responsible for actuating clutch A is running slower than the commanded speed or expected range. This typically occurs in vehicles with an automated manual transmission or dual-clutch transmission where clutch engagement is controlled by an electric motor rather than a hydraulic system. The computer sets this code when the motor's actual speed, monitored via a position or speed sensor, falls below the desired speed for a given command.

DTC codes / P28xx · Transmission / P28CA

P28CAClutch A Motor Underspeed

P28CA indicates that the transmission control module (TCM) or powertrain control module (PCM) has detected the electric motor responsible for actuating clutch A is running slower than the commanded speed or expected range. This typically occurs in vehicles with an automated manual transmission or dual-clutch transmission where clutch engagement is controlled by an electric motor rather than a hydraulic system. The computer sets this code when the motor's actual speed, monitored via a position or speed sensor, falls below the desired speed for a given command.

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.