Powertrain
Definition only
Lights the check engine lamp
P24DB: Reductant Purge Control Valve B Circuit Open
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P24DB mean?
The secondary reductant purge valve B - which clears AdBlue from injector and lines at shutdown to prevent crystallisation - has an open control circuit.
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 Open in valve or wiring
- Low Pin pushed back out of connector body
- Low Cracked solder joint inside the module or sensor
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P24DB on the same make and model first.
P24DB in the community
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