Powertrain
generic / SAE
P24F6
Exhaust Aftertreatment Fuel Air Purge Valve Stuck Open
On systems that inject HC dosing fuel or AIR-assisted reductant into the aftertreatment, a purge valve clears the line after each dosing event. The ECM detects the valve stuck open — pressure or flow does not build up against a closed valve, so the dosing line cannot be charged. Common on diesel HC-doser hardware (DPF regen support).
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / F6
Possible causes
- Mechanically stuck open valve from soot or coking high
- Broken return spring medium
- Carbon or debris buildup preventing free movement low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–900 €
- Estimated time: 0.6–2.5 h
- Component: aftertreatment purge valve
- Component: dosing line
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012