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

P0481

Cooling Fan 2 Control Circuit

An electrical fault in the cooling fan 1 control circuit (relay or PWM driver). May be set when the ECU detects an open, short, or unexpected current draw.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 81

Possible causes

  • Fan relay failed high

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 60–600 €
  • Estimated time: 0.5–3 h
  • Component: cooling fan relay
  • Component: cooling fan motor
  • Component: fan wiring
  • 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