Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Low
The control circuit of the aftertreatment purge valve reads stuck low — usually a short to ground or a failed low-side driver. The valve is energised continuously when it should be off, or the diagnostic feedback voltage is pulled below threshold.
Affected components
- Aftertreatment purge valve
- Solenoid driver
Common causes
- High likelihood: Control wire shorted to ground
- Medium likelihood: Failed low-side driver stuck on
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.