What does code P28D5 mean?

Q: What does code P28D5 mean?

Clutch B Phase U-V-W Performance. P28D5 indicates that the transmission control module has detected a performance fault in the phase U, V, or W electrical circuit for clutch B, which is used in hybrid and electric vehicle transmissions to engage or disengage a clutch pack. The computer monitors current and voltage signatures during clutch actuation and flags this code when the measured electrical response falls outside the expected profile for the commanded state.

DTC codes / P28xx · Transmission / P28D5

P28D5Clutch B Phase U-V-W Performance

P28D5 indicates that the transmission control module has detected a performance fault in the phase U, V, or W electrical circuit for clutch B, which is used in hybrid and electric vehicle transmissions to engage or disengage a clutch pack. The computer monitors current and voltage signatures during clutch actuation and flags this code when the measured electrical response falls outside the expected profile for the commanded state.

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.