Powertrain
generic / SAE
P05EF
Reductant Pump Supply Voltage Circuit Low
Same as P05EE with the supply voltage below 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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / EF
Possible causes
- Supply voltage low high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
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)
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–600 €
- Estimated time: 0.8–2.5 h
- Component: reductant pump
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012