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

P26F0

Starter Relay A Stuck On

The first starter relay stays closed when commanded off. Starter motor remains engaged after the engine is running, which can destroy the starter pinion or ring gear.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / F0

Possible causes

  • Relay contacts welded shut by inrush current high
  • ECU output driver stuck on medium
  • Carbon or debris buildup preventing free movement low

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 50–400 €
  • Estimated time: 0.3–2 h
  • Component: starter relay a
  • Component: starter motor
  • 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