OBD-II code · Powertrain (generic, extended)
P249D Closed Loop Reductant Injection Control At Limit Flow Too Low
With reductant injection running closed-loop the controller drives the dosing valve to maximum opening but cannot reach the required AdBlue flow.
Is it safe to drive with P249D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyReductant pump pressure low
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
- 1.5–5 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Injector, Reductant Pump
Related codes
- P249AEGR Cooler Bypass Position Sensor Circuit High Bank 2
- P249BEGR Cooler Bypass Position Sensor Circuit Intermittent or Erratic Bank 2
- P249CExcessive Time To Enter Closed Loop Reductant Injection Control
- P249EClosed Loop Reductant Injection Control At Limit Flow Too High
- P249FExcessive Time To Enter Closed Loop Particulate Filter Regeneration Control
- P24A0Closed Loop Particulate Filter Regeneration Control At Limit Temperature Too Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.