P2CCB code meaning
Coolant Pump Speed Sensor Circuit High
Powertrain system Generic code P2Cxx codes Check engine light
What P2CCB means
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.
P2CCB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2CCB
- MIL on
- Pump speed missing or stuck at an implausible value in live data
Common causes of P2CCB
- Most likelyOpen signal wire, input pulled up by the controller
- PossibleLost ground connection at the sensor
- PossibleSignal wire shorted to a voltage feed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant pump speed sensorWiring harnessECM
What each part of P2CCB means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| CB | The exact fault in that area. |
What to do next
- Note P2CCB and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2CCB
What does P2CCB mean?
P2CCB means "Coolant Pump Speed Sensor Circuit High". P2CCB covers the upper end of the coolant pump speed sensor signal: the input stays above its permitted maximum. It is a generic code, so it means the same on every make.
Is it safe to drive with P2CCB?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2CCB fail an emissions test?
Yes, it can. P2CCB is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2CCB to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P2CCB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.