P201FReductant Pump A Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P201F says reductant pump A keeps running or keeps building pressure although the control unit has switched it off, for example when dosing pauses or after the line has been purged at shutdown. No manufacturer documents P201F publicly. The opposite fault is well described: Ford's 2023 diesels compare pump speed with its setpoint and set P208B when it deviates by more than 300 rpm or the control output sits at its limit for 30 s, while open, low and high faults of the drive circuit get P208A, P208C and P208D. A pump that will not stop usually has a driver or relay stuck closed, a control line shorted to supply voltage, or a pump controller that ignores the command. Effects are pressure where none is wanted, DEF left in lines that may freeze, and a drained battery. CARB requires output components to respond to commands.
- What you may notice
- Malfunction indicator lamp on
- Pump audible after switching off the engine
- Battery discharged after standing
- Likely causes
- LikelyPump relay contacts welded or driver stage stuck on
- PossiblePump control wire shorted to supply voltage
- RareInternal fault in the pump or dosing control unit
- 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 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.