P2BA1Coolant Pump D Underspeed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BA1 is set when coolant pump D, a further electric pump in the manufacturer's thermal management, turns slower than its command. No manufacturer documents this code publicly, so which circuit pump D serves and which limits apply is unknown. The same check exists for other letters: Ford's 2024 gasoline summary runs it for pumps A and B as fault type B2 (P2B87, P2B9F), continuously from 11 V, and GM's 2025 tables flag a filtered command-to-feedback gap that persists 8 of 10 seconds. Under CARB 13 CCR 1968.2 (e)(15), outputs must be checked for a correct reaction to their commands. Likely causes are bearing wear, debris at the impeller, low supply voltage or poor contacts. A blocked pump is P2B6A, air P2B6C. Its loop then gets too little flow.
- What you may notice
- Check engine light or cooling warning, depending on the vehicle
- Rising temperature of the part cooled by pump D
- Likely causes
- LikelyWorn bearing or dragging impeller in pump D
- PossibleDebris or deposits slowing the impeller
- PossibleLow supply voltage or high resistance in power or ground
- RareWeak motor or drive electronics in the pump
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.