Powertrain
Definition only
Lights the check engine lamp
P249D: Closed Loop Reductant Injection Control At Limit Flow Too Low
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P249D mean?
With reductant injection running closed-loop the controller drives the dosing valve to maximum opening but cannot reach the required AdBlue flow.
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 Reductant pump pressure low
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P249D on the same make and model first.
P249D in the community
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