U040F

Invalid Data Received From Reductant Control Module

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

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

Causes

Reagent control module malfunction
Open or short circuit in the communication circuit
Poor contact in connectors
Software error in ECU
Module power problems

How to Fix

Check the integrity of wiring and connectors
Check the power supply and ground of the module
Read reagent module error codes
Update ECU software
Replace reagent control module if necessary

Related codes

U0415 U042F U0401