Powertrain, generic (extended)

P2CCA Coolant Pump Speed Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Signal wire shorted to ground
Sensor supply voltage missing because of an open feed
Sensor output stage failed in the low state

Symptoms

  • MIL on
  • Pump speed reads zero in live data although the engine runs

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

coolant pump speed sensorwiring harnessecm

Related codes

P2CC8P2CC9P2CCBP2B85

References: law.cornell.edu, patents.google.com.