P2CCACoolant Pump Speed Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2CCA is stored when the signal line of the coolant pump speed sensor remains below its lower limit, so no pulses or levels above the threshold arrive. Most often the signal wire is shorted to ground, the sensor has lost its supply voltage and therefore cannot switch, or its output stage has failed in the off state. No manufacturer documents P2CCA publicly. The measured pump speed matters to the controller because, as GM's patent US20160047374A1 explains, it is compared with the target speed to judge whether the pump works; with a dead signal that check is impossible. CARB requires out-of-range checks of such inputs. Measure supply and ground at the sensor plug first, then the signal wire to ground. The opposite level is P2CCB, implausible values P2CC9.
- What you may notice
- MIL on
- Pump speed reads zero in live data although the engine runs
- Likely causes
- LikelySignal wire shorted to ground
- PossibleSensor supply voltage missing because of an open feed
- PossibleSensor output stage failed in the low state
- 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: €30 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.