OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P279D

Four Wheel Drive (4WD) Range Signal Circuit

The 4WD range signal circuit (reporting whether 2H, 4H, 4L is engaged) returns no usable signal.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / 9D

Possible causes

  • Open range sensor or broken signal wire high
  • Corroded sensor connector medium

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 150–1000 €
  • Estimated time: 1–3.5 h
  • Component: four wd range sensor
  • Component: transfer case
  • Component: wiring harness
  • MIL / check engine light

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication