P20C9

Reductant Control Module Requested MIL Illumination

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine light is on
Reduced engine power (emergency operation mode)
Increased fuel consumption
Unpleasant exhaust smell
Error message on display

Causes

Reducer control module malfunction
Low level or poor quality of reagent (AdBlue)
Problems with NOx sensors
Open or short circuit in control circuit
Software error in SCR module

How to Fix

Check the level and quality of AdBlue reagent
Diagnose the reductant control module
Check NOx sensors and their wiring
Scan the system for other related codes
Update SCR module software if necessary

Related codes

P20EE P20E8 P20E9