P24FB
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit High
The control circuit of the aftertreatment purge valve reads stuck high — typically a short to battery voltage or an open ground/return path. The driver cannot pull the line low to actuate the valve.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to battery voltageCommon
- Open ground or open coilPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Aftertreatment Purge Valve
- Solenoid Driver
P24FB is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.