OBD-II code · Powertrain (generic)
P05F0 Reductant Pump Supply Voltage Circuit High
Same as P05EE with the supply voltage above the plausible range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P05F0?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySupply voltage above design range
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.8–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Pump
Related codes
- P05EDReductant Heater Control Module Supply Voltage
- P05EEReductant Pump Supply Voltage Circuit Open
- P05EFReductant Pump Supply Voltage Circuit Low
- P05F1Reductant Pump Supply Voltage Circuit Stuck On
- P05F2Reductant Pump Supply Voltage Circuit Stuck Off
- P05F3Exhaust Aftertreatment Power Relay Control Circuit Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.