U02A2

Lost Communication With Reductant Quality Module

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
AdBlue error message appears
Increased fuel consumption
Problems starting the engine

Causes

Open or short circuit in the communication circuit
Reagent quality module malfunction
Module power problems
Corrosion of contacts in connectors
Software error in the ECU

How to Fix

Check the integrity of the wiring to the module
Check the module supply voltage
Inspect connectors for corrosion
Scan the system for other errors
If necessary, replace the reagent quality module

Related codes

U02A1 U02A3 P20EE