Powertrain
Definition only
Lights the check engine lamp
P249C: Excessive Time To Enter Closed Loop Reductant Injection Control
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P249C mean?
After cold start the AdBlue injection runs open-loop until SCR temperature is reached. The transition into closed-loop is taking longer than calibrated.
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 SCR warm-up slow
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P249C on the same make and model first.
P249C in the community
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