What does code P28DC mean?

Q: What does code P28DC mean?

Clutch B Pressure Sensor Circuit/Open. P28DC indicates that the transmission control module (TCM) has detected an open circuit or abnormal voltage on the signal circuit of the clutch B pressure sensor, which monitors hydraulic pressure for the second clutch pack in a dual-clutch or automatic transmission. The TCM compares the sensor's voltage to expected values and sets this code when the signal is out of range, often resulting in degraded shift quality or a limp mode.

DTC codes / P28xx · Transmission / P28DC

P28DCClutch B Pressure Sensor Circuit/Open

P28DC indicates that the transmission control module (TCM) has detected an open circuit or abnormal voltage on the signal circuit of the clutch B pressure sensor, which monitors hydraulic pressure for the second clutch pack in a dual-clutch or automatic transmission. The TCM compares the sensor's voltage to expected values and sets this code when the signal is out of range, often resulting in degraded shift quality or a limp mode.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.