Powertrain, generic (extended)

P2CCB Coolant Pump Speed Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2CCB covers the upper end of the coolant pump speed sensor signal: the input stays above its permitted maximum. On sensors with an open-collector output and a pull-up resistor in the controller, an interrupted signal wire or a sensor that has lost its ground leaves the line resting high, so the open case often lands here rather than under P2CCA. A short between the signal wire and a voltage feed has the same effect. No manufacturer documents P2CCB publicly. GM's patent US20160047374A1 shows why the controller needs a valid reading: it judges the pump by comparing measured and target speed. CARB requires range checks for inputs like this. Checking the sensor ground and the signal wire for continuity usually finds the fault. Low levels are P2CCA, a general circuit fault P2CC8.

Likely causes

Open signal wire, input pulled up by the controller
Lost ground connection at the sensor
Signal wire shorted to a voltage feed

Symptoms

  • MIL on
  • Pump speed missing or stuck at an implausible value in live data

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

P2CC8P2CC9P2CCAP26CE

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