Powertrain, generic (extended)

P20FA Reductant Pump B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P20FA means the controller has found an open or otherwise faulty drive circuit for the second reductant (DEF/AdBlue) pump, called pump B or pump 2. No public service text explains which physical pump carries this letter; it is a driver channel of its own, separate from pump A (P208A). Ford stores P20FA together with P20FC and P20FD on 2023–2024 Super Duty and F-650/F-750 trucks with the 6.7L diesel (SSM 51891 and 52299, MIL lit) and asks technicians to check two connectors for seating and three more for water ingress and corrosion before normal diagnosis. FCA lists it as Reductant Pump 2 Control Circuit/Open for 3.0L EcoDiesel models and counts it among the faults that start the Service DEF countdown. With the pump unpowered, dosing stalls and NOx output climbs.

Likely causes

Water ingress or corrosion in the pump B connectors or harness
Connector not fully latched after assembly or repair
Open winding or internal break in pump B
Faulty output stage in the engine or DEF control module

Symptoms

  • Malfunction indicator lamp on
  • Service DEF or AdBlue warning with countdown to restart lockout
  • Other SCR codes stored at the same time (P208A, P20FC, P20FD)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

reductant pumpwiring harness

Related codes

P20FBP20FCP20FDP208A

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.