Powertrain, generic (extended)

P2AD9 Reductant Pump Motor Position Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2AD9 is the high-side fault: the pump motor position signal stays above its permitted range. An open signal line pulled up by the controller's internal resistor, a broken sensor ground or a short to the supply rail produce this picture. Without changing position information, speed control fails and the pressure build-up may be aborted; faults of the pump drive itself carry their own codes, in Ford's diesel summary for example P208A to P208D. No public document describes P2AD9 itself or its limit. Look for white DEF residue in the pump connector, since the fluid creeps along wires and attacks terminals, and check the ground connection before condemning the pump. A failure that stops dosing triggers the driver warning and, if ignored, the speed or restart restrictions of the SCR system.

Likely causes

Open signal line or broken sensor ground
DEF residue corroding the pump connector
Signal shorted to the supply rail

Symptoms

  • Check engine light and SCR warning
  • No DEF pressure build-up, dosing stops

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time1–4 h

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

Parts involved

reductant pump motor position sensorreductant pumpwiring harness

Related codes

P2AD6P2AD8P2AD7P208D

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