P2BA8

NOx Exceedence - Interruption of Reagent Dosing Activity

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$28–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
SCR error message on instrument panel
Ammonia smell from exhaust system

Causes

Clogged reagent injection nozzle
SCR pump malfunction
Low level or poor quality of AdBlue reagent
NOx sensor malfunction
Problems with the wiring or connectors of the SCR system

How to Fix

Check the level and quality of AdBlue reagent
Clean or replace the reagent injection nozzle
Check the functionality of the SCR pump
Diagnose NOx sensors and their wiring
Reset the error and conduct a test cycle of the SCR system

Related codes

P20EE P20E9 P2201