Powertrain
generic / SAE
P05F5
Exhaust Aftertreatment Power Relay Control Circuit High
Same as P05F3 with the control line shorted to supply. 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 / F5
Possible causes
- Control line shorted to supply high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–350 €
- Estimated time: 0.5–1.8 h
- Component: aftertreatment power relay
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012