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

P26D3

Engine Coolant Pump Supply Voltage Circuit

The dedicated supply voltage line to the coolant pump module is faulty. Pump cannot operate without battery feed.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / D3

Possible causes

  • Blown fuse on supply line high
  • High-resistance contact in supply harness medium

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 60–600 €
  • Estimated time: 0.5–2.5 h
  • Component: smart coolant pump module
  • Component: supply circuit
  • 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