OBD-II code · Powertrain (generic)
P05F7 Exhaust Aftertreatment Power Relay Control Circuit Stuck Off
Same as P05F3 with the relay not engaging on command.
Is it safe to drive with P05F7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyRelay does not engage
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.8 h
- Emissions test
- Likely to fail
- Parts involved
- Aftertreatment Power Relay
Related codes
- P05F4Exhaust Aftertreatment Power Relay Control Circuit Low
- P05F5Exhaust Aftertreatment Power Relay Control Circuit High
- P05F6Exhaust Aftertreatment Power Relay Control Circuit Stuck On
- P05F8Reductant Heater Control Module Performance
- P05F9Stop-Start Status Signal Circuit
- P05FAStop-Start Status Signal Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.