What does code P285F mean?

Q: What does code P285F mean?

Shift Fork B Actuator Circuit/Open. P285F indicates that the transmission control module (TCM) has detected an open circuit in the electrical path for the Shift Fork B actuator, which is part of an automated manual or dual-clutch transmission's shift mechanism. The TCM monitors the actuator circuit for expected voltage or current and sets this code when the signal is missing or out of range, typically due to a wiring fault, connector issue, or failed actuator.

DTC codes / P28xx · Transmission / P285F

P285FShift Fork B Actuator Circuit/Open

P285F indicates that the transmission control module (TCM) has detected an open circuit in the electrical path for the Shift Fork B actuator, which is part of an automated manual or dual-clutch transmission's shift mechanism. The TCM monitors the actuator circuit for expected voltage or current and sets this code when the signal is missing or out of range, typically due to a wiring fault, connector issue, or failed actuator.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

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.