P2AD6Reductant Pump Motor Position Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light and SCR warning
- DEF dosing stops; countdown to speed limitation
- Likely causes
- LikelyPosition sensor or electronics inside the pump module defective
- PossibleDEF residue or corrosion in the pump connector
- RareMissing supply or ground for the pump electronics
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €300 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.