P05F2Reductant Pump Supply Voltage Circuit Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The electric supply pump in the diesel exhaust fluid (DEF, AdBlue) tank module builds the dosing pressure for the SCR catalyst. Its supply voltage is monitored separately from the pump control circuit (P208A ff); CARB requires SCR components and their outputs to be checked for circuit faults and function. P05F2 means the pump supply cannot be switched on: after the switch-on command no voltage or feedback appears at the pump branch, so no pressure builds up. Chrysler (FCA) lists this code among those that trigger the DEF inducement: a 'Service DEF System' warning, a countdown after 50 miles and no restart after 150 miles (P241D). Without supply the pump cannot build pressure, dosing stops and NOx rises; pressure or SCR efficiency codes may follow.
- What you may notice
- Check engine light on
- DEF/AdBlue warning, possibly countdown to no-restart
- Follow-up codes for low DEF pressure or SCR efficiency
- Likely causes
- LikelyRelay does not pull in or fuse blown
- PossibleOpen in the relay control or load circuit
- RareOutput driver in the engine module faulty
- RareElectronics of the tank module faulty (no feedback)
- 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: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.