OBD-II code · Powertrain (generic, extended)
P279F Four Wheel Drive (4WD) Range Signal Circuit Low
Voltage on the 4WD range signal line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P279F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal short in range sensor
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Four Wd Range Sensor, Wiring Harness
Related codes
- P279CTransfer Case Gear Neutral Incorrect Ratio
- P279DFour Wheel Drive (4WD) Range Signal Circuit
- P279EFour Wheel Drive (4WD) Range Signal Circuit Range/Performance
- P27A0Four Wheel Drive (4WD) Range Signal Circuit High
- P27A1Electric/Auxiliary Transmission Fluid Pump A Stuck On
- P27A2Electric/Auxiliary Transmission Fluid Pump B Control Circuit / Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.