P2D27Coolant Pump F Control Circuit Performance/Stuck Off
- 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
- P2D27 is the functional check for coolant pump F, the sixth auxiliary pump in the lettering scheme and thus only relevant on vehicles with very many electric pumps, typically plug-in hybrids, electric vehicles or heavy diesels with several separate loops. The control line answers, yet the pump stays off or falls short of what the module expects from speed, current or temperature response. No manufacturer publicly documents P2D27, and unlike pump E no further pump F fault codes appear in common code lists. Published logic exists only for siblings: GM's 2025 diesel table judges pump C (P2C48) by comparing phase current with speed above 2,800 rpm, 10 failures out of 12, type B. Ford's 2024 gasoline summary watches its pumps A and B (P2601, P261B) for 5 s from 11 V. Check the loop, then pump and wiring.
- What you may notice
- Malfunction indicator lamp on
- Overtemperature in the component or loop served by pump F
- Power limitation if the cooled component protects itself
- Likely causes
- LikelyPump F blocked or worn so it runs too weakly
- PossibleAir pocket or low coolant in the circuit of pump F
- PossibleCorroded connector or high resistance in the pump F supply
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.