P2CC8Coolant Pump Speed Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Some engines measure how fast a coolant pump turns with a dedicated speed sensor, for instance on a pump that can be engaged and released or on an electric pump read back by the controller. P2CC8 is the general fault of that sensor's circuit: the signal is absent or cannot be used, without the controller deciding whether it is too low or too high. No manufacturer documents P2CC8 publicly. GM's patent US20160047374A1 describes how a measured pump speed, compared with the target, lets the controller diagnose an electric main coolant pump; Audi's patent US8915127B2 shows that without such a signal a switchable pump can only be judged indirectly through cylinder head temperature. CARB requires monitoring of coolant flow devices other than a thermostat. Expect a MIL and a default pump state.
- What you may notice
- MIL on
- Coolant pump held in a default state, warm-up may change
- Likely causes
- LikelyFailed speed sensor delivering no usable signal
- PossibleDamaged wiring or loose connector at the sensor
- RareMissing reference voltage or ground for the sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.