Exhaust Aftertreatment Power Relay Control Circuit Open
The power relay that supplies the entire exhaust aftertreatment system (DOC, DPF, SCR sensors and heaters) reports an open control circuit. Aftertreatment effectively goes offline.
Affected components
- Aftertreatment power relay
Common causes
- High likelihood: Open in relay control or harness
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
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.