P2B63Coolant 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
- P2B63 means coolant pump B is powered and commanded but its rotor does not turn, or stays far below target speed. Brushless auxiliary pumps notice this themselves, for example from high current without rotation, and report it to the engine computer. Ford lists the code in its 2024 gasoline OBD summary as failure type 71 (actuator stuck) of pump B, base code P261A, checked continuously above 11 V battery voltage. Causes are a seized bearing, debris or deposits jamming the impeller, a pump frozen in a weak antifreeze mix, or an internally failed motor. GM's patent US20160047374A1 explains how comparing measured current and speed against expected values exposes such a pump fault. P2B65 signals the opposite case, too little load. Pump D has the twin code P2B6A.
- What you may notice
- Warning lamp with stored code
- No audible pump run after the ignition is switched on
- Overheating of the component served by pump B
- Likely causes
- LikelyBearing seized or impeller jammed by debris or deposits
- PossibleElectric motor or electronics inside the pump failed
- RareCoolant frozen in the pump because antifreeze concentration is too low
- 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: €150 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.