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

P26DF

Sensor Power Supply D Circuit / Open

The 5 V supply rail D for sensors is open. All sensors fed from this rail report invalid readings.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / DF

Possible causes

  • Open wire on the supply rail high
  • Open inside the ECU regulator output medium

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 120–1200 €
  • Estimated time: 0.8–4 h
  • Component: control module
  • Component: sensor supply d
  • 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