Powertrain
Definition only
Lights the check engine lamp
P24DF: Reductant Purge Control Valve B Stuck Open
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P24DF mean?
Purge valve B is mechanically stuck open - AdBlue lines drain continuously, dosing pressure cannot build.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Common causes
- High Valve stuck open
- Low Carbon or debris buildup preventing free movement
- Low Component wear with age - mechanical play
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P24DF on the same make and model first.
P24DF in the community
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