Powertrain, generic (extended)

P2AD6 Reductant Pump Motor Position Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2AD6 is the general circuit code of the position sensor in the motor of the reductant (DEF) pump. Modern supply pumps often use a brushless motor whose rotor position must be known for commutation and speed control; a Cummins Emission Solutions patent names a Hall-effect rotor position sensor as one option and back-EMF evaluation as the sensorless alternative. No manufacturer publishes a description of P2AD6. The code covers faults of the sensor circuit itself that are not clearly low or high (P2AD8, P2AD9), for example an implausible or missing pattern. In most designs sensor, motor and electronics form a sealed pump module, so the repair is a new pump unit after the harness and supply have been checked. If the pump cannot be controlled, dosing stops and the SCR warning sequence begins.

Likely causes

Position sensor or electronics inside the pump module defective
DEF residue or corrosion in the pump connector
Missing supply or ground for the pump electronics

Symptoms

  • Check engine light and SCR warning
  • DEF dosing stops; countdown to speed limitation

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€300–1,500
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

P2AD7P2AD8P2AD9P208A

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