What does code P285A mean?

Q: What does code P285A mean?

Clutch B Pressure Disengagement Performance/Too Low. P285A is a generic powertrain code indicating that the transmission control module (TCM) has detected a problem with the hydraulic pressure circuit responsible for disengaging clutch B. The computer monitors pressure switches or models expected pressure during clutch release and sets this code when the measured or inferred pressure is lower than expected, meaning clutch B may not fully disengage when commanded.

DTC codes / P28xx · Transmission / P285A

P285AClutch B Pressure Disengagement Performance/Too Low

P285A is a generic powertrain code indicating that the transmission control module (TCM) has detected a problem with the hydraulic pressure circuit responsible for disengaging clutch B. The computer monitors pressure switches or models expected pressure during clutch release and sets this code when the measured or inferred pressure is lower than expected, meaning clutch B may not fully disengage when commanded.

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.