What does code P279F mean?

Q: What does code P279F mean?

Four Wheel Drive (4WD) Range Signal Circuit Low. P279F means the four-wheel-drive (4WD) control module has detected a low-voltage condition on the range signal circuit, which is the wire that tells the module whether the transfer case is in high or low range. The computer sets this code when the signal voltage stays below the expected threshold for a calibrated amount of time, indicating an open circuit, a short to ground, or a faulty range sensor.

DTC codes / P27xx · Transmission / P279F

P279FFour Wheel Drive (4WD) Range Signal Circuit Low

P279F means the four-wheel-drive (4WD) control module has detected a low-voltage condition on the range signal circuit, which is the wire that tells the module whether the transfer case is in high or low range. The computer sets this code when the signal voltage stays below the expected threshold for a calibrated amount of time, indicating an open circuit, a short to ground, or a faulty range sensor.

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.