What does code P278F mean?

Q: What does code P278F mean?

Clutch B Adaptive Learning at Limit. P278F indicates that the transmission control module (TCM) has reached the limit of its adaptive learning strategy for clutch B, meaning the computer can no longer adjust clutch engagement to compensate for wear or hydraulic variation. The TCM stores this code when the learned adaptation value for clutch B hits its maximum or minimum allowed threshold during a shift or engagement event.

DTC codes / P27xx · Transmission / P278F

P278FClutch B Adaptive Learning at Limit

P278F indicates that the transmission control module (TCM) has reached the limit of its adaptive learning strategy for clutch B, meaning the computer can no longer adjust clutch engagement to compensate for wear or hydraulic variation. The TCM stores this code when the learned adaptation value for clutch B hits its maximum or minimum allowed threshold during a shift or engagement event.

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.