OBD-II code · Powertrain (generic)
P05F2 Reductant Pump Supply Voltage Circuit Stuck Off
Same as P05EE with the supply stuck off - relay does not energise on command.
Is it safe to drive with P05F2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySupply relay does not engage
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
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
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Pump Supply Relay
Related codes
- P05EFReductant Pump Supply Voltage Circuit Low
- P05F0Reductant Pump Supply Voltage Circuit High
- P05F1Reductant Pump Supply Voltage Circuit Stuck On
- P05F3Exhaust Aftertreatment Power Relay Control Circuit Open
- P05F4Exhaust Aftertreatment Power Relay Control Circuit Low
- P05F5Exhaust Aftertreatment Power Relay Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.