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

P05C2

Engine Coolant Pressure Sensor Circuit

A general circuit fault is detected on the engine coolant pressure sensor - used to detect a pressurised coolant system that has lost pressure (cap, hose, head gasket leak) or is over-pressurised (combustion gases entering coolant).

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / C2

Possible causes

  • Open in sensor or wiring high

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 80–300 €
  • Estimated time: 0.4–1.4 h
  • Component: engine coolant pressure sensor
  • 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