P027DFuel Pump Module B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- On demand-controlled fuel systems the engine module does not drive the pump itself but sends a pump control module the desired pump output on a separate control line, usually as a duty cycle; the module reports back on a monitor line or via CAN. Module B is a second pump module, for example on dual-tank commercial vehicles. P027D means the control circuit to pump module B reads high, typically a short to voltage – the counterpart of P025D. Ford lists it in the low-pressure lift pump monitor of its 2023 diesels, monitored continuously and set within 0.5 s, without its own threshold. Pump B may then run all the time or not at all.
- What you may notice
- Check engine light on
- Pump B runs all the time or not at all
- Starting problems
- Likely causes
- LikelyControl line to module B shorted to voltage
- PossibleMoisture or corrosion in the connector
- PossiblePump control module B faulty
- 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: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.