U031B

Software Incompatibility With DC/DC Converter Control Module A

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

~$167 (est.)

Symptoms

Check Engine light comes on
Problems with charging a high-voltage battery
Reduced vehicle power
Errors in the operation of electrical systems
The car goes into emergency mode

Causes

Outdated control unit software
Error during software update
Software version mismatch between modules
Software corruption
Problems with communication between modules

How to Fix

Check the software is up to date
Update DC/DC converter control module software
Update main control unit software
Check the quality of communication between modules
Repair only from an authorized dealer

Related codes

U031A U031C U031D