P2CB3 code meaning
Charge Air Cooler Coolant Pump B Stuck/Stalled
Powertrain system Generic code P2Cxx codes Check engine light
What P2CB3 means
P2CB3 is reported when charge air cooler pump B receives power and a command but its rotor does not turn. The pump's own electronics usually detect this from current flowing without rotation and pass the result to the engine module. No manufacturer documents P2CB3 publicly. Ford's 2024 gasoline OBD summary uses the same fault type, 71 (actuator stuck), for its auxiliary coolant pump B (P2B63), checked continuously from 11 V over 5 s. Audi bulletin 2080825 shows a typical trigger on pump A (P2BC1): the V188 pump of 2025–2026 A5, S5 and Q5 can stick after the car stood unused for over two months. Seized bearings, debris, frozen coolant or a burnt winding are other causes. A pump that turns, only too slowly, sets P2CB2.
P2CB3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2CB3
- MIL on, often with a reduced-power message
- No flow in the second branch of the charge air cooling loop
Common causes of P2CB3
- Most likelyRotor stuck after a long period without use
- PossibleDebris or deposits jamming the impeller of pump B
- PossibleBurnt winding or failed drive electronics in the pump
- Less likelyCoolant frozen because of insufficient antifreeze
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cac coolant pump bWiring harnessECM
What each part of P2CB3 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. |
| B3 | The exact fault in that area. |
What to do next
- Note P2CB3 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 P2CB3
What does P2CB3 mean?
P2CB3 means "Charge Air Cooler Coolant Pump B Stuck/Stalled". P2CB3 is reported when charge air cooler pump B receives power and a command but its rotor does not turn. It is a generic code, so it means the same on every make.
Is it safe to drive with P2CB3?
Drive gently and only to a workshop. With P2CB3 the car can go into limp mode (reduced power) to protect itself.
Will P2CB3 fail an emissions test?
Yes, it can. P2CB3 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 P2CB3 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will P2CB3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.