P2B9CCoolant Pump A Stuck/Stalled
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2B9C signals that coolant pump A is powered and commanded but its rotor does not turn, or stops. Ford uses the code in its 2024 gasoline OBD summary as fault type 71 (actuator stuck) under P2600, where pump A is the auxiliary pump in the high-temperature loop for cabin heating; the check runs continuously above 11 V battery voltage over 5 seconds. Brushless pumps detect a locked rotor themselves, typically from high current without rotation, and report it to the engine computer; the GM patent US20160047374A1 explains how comparing measured current and speed with expected values exposes such faults. Usual reasons are a seized bearing, sludge or debris, frozen coolant or a burnt winding. Pump B has P2B63, pump D P2B6A. A pump that only runs slow sets P2B87.
- What you may notice
- Little or no cabin heat
- Check engine light
- Pump silent when it should run
- Likely causes
- LikelySeized bearing or rotor in the auxiliary pump
- PossibleSludge, sealant residue or debris jamming the impeller
- RareCoolant frozen in the pump due to weak antifreeze
- RareBurnt motor winding or failed drive electronics
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.