Exhaust Aftertreatment Power Relay Control Circuit Stuck On
The aftertreatment power relay is stuck on - aftertreatment electronics stay powered after key-off, draining the battery.
Affected components
- Aftertreatment power relay
Common causes
- High likelihood: Relay welded closed
- Low likelihood: Carbon or debris buildup preventing free movement
- Low likelihood: Component wear with age - mechanical play
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.