U04B6

Invalid Data Received From Catalyst Heater Control Module

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$50–167 (est.)

Symptoms

Check Engine light comes on
Possible starting problems in cold weather
Reduced catalytic converter efficiency
Deterioration of the vehicle's environmental performance

Causes

Malfunction of the catalyst heating control module
Damage to the wiring harness to the module
Module power problems
Corrosion of contacts in connectors
Software error in the module

How to Fix

Diagnostics of the module power circuit
Checking the integrity of the wiring harness
Diagnostics of connectors for corrosion
Checking the functionality of the control module
Update module software if necessary

Related codes

U04B5 U04B7 U04B8