P2CB0Charge Air Cooler Coolant Pump B Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2CB0 flags that charge air cooler pump B is electrically in order but does not work the way its operating data say it should. No manufacturer documents the code publicly. GM shows how the same check runs on pump A (P026E) in its 2025 diesel table 25OBDG04B: the motor phase current expected for the measured pump speed is compared with the actual current, and an error above 5 A for more than 5 s, with the pump above 1,000 rpm and coolant between 10 and 126 °C, sets the code after 16 failures in 20 samples – Type A, MIL on the first trip. Bosch describes such pumps as brushless units whose own circuit board handles motor control and diagnosis. Worn bearings, a damaged impeller, a restricted loop or low coolant are typical. Pure over- or underspeed has its own codes, P2CB1 and P2CB2.
- What you may notice
- MIL on
- Charge air temperature higher than normal, power reduced
- Unusual whining or rattling from the pump
- Likely causes
- LikelyLow coolant level or air pockets in the charge air cooler loop
- PossibleWorn bearing or damaged impeller in pump B
- PossibleKinked hose, clogged cooler or debris restricting flow
- 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: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.