P05F7
Exhaust Aftertreatment Power Relay Control Circuit Stuck Off
Same as P05F3 with the relay not engaging on command.
Same as P05F3 with the relay not engaging on command.
Common causes
- high
Relay does not engage
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-390
- low
Carbon or debris buildup preventing free movement
Less common, but worth ruling out after the more likely causes.
Typical part cost: $90-390
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P05F7.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P05F7.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P05F7.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P05F7 mean?
P05F7 means "Exhaust Aftertreatment Power Relay Control Circuit Stuck Off". It is a generic OBD-II code that points to a fault in the vehicle speed, idle control, auxiliary inputs.
What are the most common causes of P05F7?
relay does not engage; carbon or debris buildup preventing free movement; component wear with age - mechanical play — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P05F7 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.