P05F2
Reductant Pump Supply Voltage Circuit Stuck Off
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace the Reductant Pump Relay if it is faulty.
- Inspect and repair any loose or damaged wiring in the Reductant Pump Supply Voltage Circuit.
- Clean or replace the Reductant Pump if it is clogged or malfunctioning.
- Verify and repair any issues with the ECM (Engine Control Module) or PCM (Powertrain Control Module) related to the Reductant Pump Supply Voltage Circuit.
Common causes
Most likely first
- Faulty reductant pump
- Issues with the reductant pump supply voltage circuit
- Wiring or connection problems related to the reductant pump
- Faulty reductant pump control module
- Malfunctioning sensors related to reductant pump operation
How to diagnose & fix
Work through it in order
- Check Engine Light illuminated
- Reduced engine power
- Difficulty starting the vehicle
- Poor fuel efficiency
- Vehicle fails emission test
Read & clear P05F2 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.