P279EFour Wheel Drive (4WD) Range Signal Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P279E flags a 4WD range signal that is electrically present but does not make sense: it may show a range the transfer case cannot be in, jump between high, low and neutral without a request, or contradict what the speed ratio across the transfer case shows. Such a plausibility check typically compares the reported range with commanded shifts and with the measured ratio monitored by P279A to P279C. No manufacturer documents P279E publicly with set conditions; GM's 2008 Two-Mode Hybrid control module shows how the same range information is validated by its circuit code P279D, and CARB 13 CCR 1968.2 requires rationality checks for such inputs. Causes are a misadjusted or worn range sensor, a shift motor stopping between positions, or wiring that intermittently loses contact.
- What you may notice
- 4WD indicator shows a range that does not match the actual drive
- Range shifts refused or completed only partly
- Warning lamp
- Likely causes
- LikelyWorn or misadjusted transfer case range sensor
- PossibleTransfer case shift motor stopping between ranges
- PossibleIntermittent contact in the range signal wiring
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.