P279E
Four Wheel Drive (4WD) Range Signal Circuit Range/Performance
Drivetrain / 4WD
Generic OBD-II
Low
What it means
P279E means the 4WD range signal is present but out of its expected range, so the control module can't trust which range (high or low) is selected. It doesn't affect the engine or normal driving, but 4WD range selection may not work correctly until the sensor or wiring is repaired.
Low
Can I keep driving? Yes — normal driving is unaffected; the 4WD range signal is out of range, so range selection (high/low) may not work correctly until repaired.
Common symptoms
What you'll notice
- Check-engine or 4WD/service-4WD warning light on
- 4WD range (high/low) won't change, or changes unexpectedly
- 4WD indicator shows the wrong range or an implausible state
Common causes
Most likely first
- Faulty 4WD range/position sensor or switchLikely
- Damaged, shorted, or corroded wiring in the range signal circuitCommon
- Poor connector contact at the sensor or transfer-case control moduleCommon
- Faulty transfer-case shift actuator or control moduleLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the range-signal connector and wiring for corrosion or damage.
- Compare the reported range signal against the actual selected range; an out-of-range value points to a failing sensor or wiring fault.
- Test the range sensor/switch through its positions; replace if the signal is erratic or implausible.
- If the signal is good, inspect the transfer-case actuator and control module. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P279E?+
Yes for normal on-road use. Don't count on 4WD range switching to work reliably for off-road or low-traction conditions until it's fixed.
Can I just clear P279E?+
It will come back if the range sensor or its wiring is faulty. Diagnose the signal circuit rather than only clearing it.
Related codes
Often seen with P279E
Read & clear P279E yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX