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

P26D2

Engine Coolant Pump Control Module Over Temperature

The smart coolant pump controller has reached over-temperature. Sustained high duty or insufficient cooling air flow.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / D2

Possible causes

  • Sustained high duty cycle from cooling demand high
  • Cooling air channel blocked by debris medium

Symptoms

  • Check engine light on
  • Cooling fan runs constantly or not at all
  • Cabin heater weak or excessively hot
  • Possible long warm-up time or hard cold start

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 200–1200 €
  • Estimated time: 1–3.5 h
  • Component: smart coolant pump module
  • 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