P025BFuel Pump Module A Control Circuit Range/Performance
- 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. P025B means pump module A receives a signal, but an invalid command – the duty cycle is outside the valid window or implausible. Ford's module signals this with a 20 % (±4 %) duty cycle on its monitor line; the check runs continuously at 11–16 V over 2–5 s. Whether the warning light comes on depends on the vehicle. Typical causes are contact resistance in the control line or connector that distorts the duty cycle, a poor ground or a faulty module.
- What you may notice
- Check engine light (manufacturer-dependent)
- Hard or no start
- Rough idle, surging
- Lack of power from wrong fuel pressure
- Likely causes
- LikelyContact resistance or corrosion in the control line or connector distorting the duty cycle
- PossiblePump control module faulty
- PossibleInterference or poor ground between engine module and pump module
- RareEngine module software or output
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.