OBD-II code · Powertrain (generic, extended)
P249C Excessive Time To Enter Closed Loop Reductant Injection Control
After cold start the AdBlue injection runs open-loop until SCR temperature is reached. The transition into closed-loop is taking longer than calibrated.
Is it safe to drive with P249C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySCR warm-up slow
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)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Scr Catalyst, Reductant Injection Control
Related codes
- P2499EGR Cooler Bypass Position Sensor Circuit Low Bank 2
- P249AEGR Cooler Bypass Position Sensor Circuit High Bank 2
- P249BEGR Cooler Bypass Position Sensor Circuit Intermittent or Erratic Bank 2
- P249DClosed Loop Reductant Injection Control At Limit Flow Too Low
- P249EClosed Loop Reductant Injection Control At Limit Flow Too High
- P249FExcessive Time To Enter Closed Loop Particulate Filter Regeneration Control
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.