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

P25A5

Fuel Mode Select Switch Performance

The fuel mode select switch is electrically intact, but its state does not match operating conditions — switched to gas while gas tank is empty, or fast toggling. The ECM rejects the request to avoid stalling.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / A5

Possible causes

  • Switch contact bounce high

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 60–350 €
  • Estimated time: 0.3–1.5 h
  • Component: fuel mode switch
  • 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