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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).

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: easy

Common causes

Ordered by how often each turns out to be the cause.

  • Open in sensor or wiringCommon

Parts involved

  • Engine Coolant Pressure Sensor

P05C2 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.