What does code P27F1 mean?

DTC codes / P27xx · Transmission / P27F1

P27F1Transmission Range Control B Position Sensor/Switch Circuit Low

P27F1 indicates that the transmission control module (TCM) has detected a low-voltage condition on the circuit for the transmission range control B position sensor or switch, which is used to confirm the selected gear range. The TCM compares the expected signal voltage against what it actually receives and sets this code when the circuit remains below the calibrated threshold for a set period.

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.