U0425

Invalid Data Received From Auxiliary Heater Control Module

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Auxiliary heater does not work
Error message on the dashboard
Reduced interior heating efficiency
Problems starting the engine in cold weather (for diesel engines)

Causes

Malfunction of the additional heater control module
Damage to the wiring harness to the heater
Poor contact in connectors
Software error in the ECU
Heater module power supply problems

How to Fix

Check the integrity of the wiring harness to the heater
Check connections and contacts in connectors
Test the heater control module
Update ECU software
Replace the control module if necessary

Related codes

U0420 U0422 U0423