P249D

Closed Loop Reductant Injection Control At Limit - Flow Too Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Low AdBlue level message appears
Unpleasant exhaust smell

Causes

Low level of AdBlue reagent in the tank
AdBlue injection nozzle is dirty or clogged
AdBlue pump malfunction
Damaged or clogged SCR system piping
AdBlue level or quality sensor malfunction

How to Fix

Check and, if necessary, add AdBlue reagent
Check the condition of the AdBlue injection nozzle for contamination
Diagnose the operation of the AdBlue supply pump
Check the integrity and permeability of the SCR system pipelines
Check the serviceability of the AdBlue level and quality sensors

Related codes

P249C P249E P20EE