P2B64Coolant Pump B Control Module Overtemperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2B64 reports that the electronics built into coolant pump B have become too hot and the pump has protected itself, usually by derating or shutting down. In Ford's 2024 gasoline OBD summary it is failure type 98 (system over temperature) of the pump B check under P261A, monitored continuously. Such overheating mostly follows a lack of cooling for the pump's own driver: coolant missing or full of air, a motor labouring against a sticking impeller, very hot surroundings near turbo or exhaust, or an ageing power stage. Because these pumps shed the heat of their electronics into the coolant they move, level and bleeding come first in diagnosis. P2B63 (stalled) and P2B65 (air) often share the root cause. Pump A has P2B9E, pump D P2B6B.
- What you may notice
- Warning lamp with stored code
- Pump stops intermittently, often after long or hot drives
- Reduced cooling of the served component
- Likely causes
- LikelyCoolant level low or air at the pump, so the electronics are not cooled
- PossibleSluggish impeller raises motor current and heat
- PossiblePower stage inside the pump degraded
- RareDamaged heat shield or high radiant heat at the mounting point
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.