Powertrain, generic (extended)

P201F Reductant Pump A Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Pump relay contacts welded or driver stage stuck on
Pump control wire shorted to supply voltage
Internal fault in the pump or dosing control unit

Symptoms

  • Malfunction indicator lamp on
  • Pump audible after switching off the engine
  • Battery discharged after standing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant pumpreductant pump relay

Related codes

P208AP208BP208DP20E9

References: law.cornell.edu, fordservicecontent.com.