P201F code meaning
Reductant Pump A Stuck On
Powertrain system Generic code P20xx codes Check engine light
What P201F means
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.
P201F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P201F
- Malfunction indicator lamp on
- Pump audible after switching off the engine
- Battery discharged after standing
Common causes of P201F
- Most likelyPump relay contacts welded or driver stage stuck on
- PossiblePump control wire shorted to supply voltage
- Less likelyInternal fault in the pump or dosing control unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant pumpReductant pump relay
What each part of P201F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 1F | The exact fault in that area. |
What to do next
- Note P201F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P201F
What does P201F mean?
P201F means "Reductant Pump A Stuck On". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P201F?
Drive gently and only to a workshop. With P201F the car can go into limp mode (reduced power) to protect itself.
Will P201F fail an emissions test?
Yes, it can. P201F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P201F to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P201F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.