U0325

Software Incompatibility With Auxiliary Heater Control Module

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

~$167 (est.)

Symptoms

Auxiliary heater does not work
Error message on the dashboard
Problems with climate control
Check Engine light comes on
Reduced functionality of the heating system

Causes

Outdated ECU software
Incompatible heater module software version
Data corruption in module memory
Problems with communication between modules
Incorrect installation or module replacement

How to Fix

Check software versions in the ECU and heater module
Update the software to the latest version
Check the integrity of the wiring harness between the modules
Perform CAN bus diagnostics
If necessary, reflash or replace the heater module

Related codes

U0324 U0326 U0327