What does code P279D mean?

Q: What does code P279D mean?

Four Wheel Drive (4WD) Range Signal Circuit. P279D indicates that the four-wheel drive (4WD) control module has detected an implausible or missing signal on the circuit that reports the current 4WD range (such as 2WD, 4WD High, or 4WD Low). The computer compares the range signal from the transfer case switch or actuator against other inputs and sets this code when the voltage or message does not match the expected value for the commanded range.

DTC codes / P27xx · Transmission / P279D

P279DFour Wheel Drive (4WD) Range Signal Circuit

P279D indicates that the four-wheel drive (4WD) control module has detected an implausible or missing signal on the circuit that reports the current 4WD range (such as 2WD, 4WD High, or 4WD Low). The computer compares the range signal from the transfer case switch or actuator against other inputs and sets this code when the voltage or message does not match the expected value for the commanded range.

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.