P2CC9Coolant Pump Speed Sensor Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2CC9 means the coolant pump speed sensor delivers a clean electrical signal whose value does not make sense. The controller compares it with what the pump should be doing: a belt-driven pump has to follow engine speed in a fixed ratio once engaged, an electric pump should match its commanded speed. A gap can come from the sensor itself (wrong air gap, damaged trigger wheel, drifting electronics) or from a real pump problem such as a slipping belt or clutch. No manufacturer documents P2CC9 publicly. GM's patent US20160047374A1 builds its electric pump diagnosis on exactly this difference between measured and target speed. CARB asks for rationality checks on such inputs. Unlike P2CC8, P2CCA and P2CCB, the wiring is usually fine, so check the pump drive before replacing the sensor.
- What you may notice
- MIL on after repeated detection
- Engine may run warmer than usual or take longer to warm up
- Likely causes
- LikelySlipping belt or clutch, so the pump turns slower than expected
- PossibleSensor loose, wrong air gap or damaged trigger wheel
- PossibleSensor electronics drifting or dropping pulses
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.