P2CB3Charge Air Cooler Coolant Pump B Stuck/Stalled
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL on, often with a reduced-power message
- No flow in the second branch of the charge air cooling loop
- Likely causes
- 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
- RareCoolant frozen because of insufficient antifreeze
- 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: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.