P21CE

Reductant Quality Module Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
SCR System Error Message
Unpleasant exhaust smell

Causes

Reductant quality module malfunction
Problems with wiring to the module
Low quality or contamination of the reductant
Control module software error
Mechanical damage to the module

How to Fix

Check the quality and level of the reductant
Diagnose the reductant quality module
Check the integrity of wiring and connectors
Replace the reductant quality module if necessary
Update ECU software

Related codes

P20EE P21C8 P21C9