U0299

Lost Communication With DC/DC Converter Control Module B

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–556 (est.)

Symptoms

Check Engine light comes on
The car goes into emergency mode
Reduced engine power
Problems with charging a high-voltage battery
Errors in other systems related to high voltage equipment

Causes

Open or short circuit in the communication circuit
Malfunction of DC/DC converter module B
Connector problems or contact corrosion
Software error in the control unit
Module power problems

How to Fix

Check the integrity of the wiring and connectors in the communication circuit
Check the power and ground of the DC/DC converter module
Scan all modules for additional errors
Check or replace DC/DC converter module B
Update control unit software

Related codes

U0298 U0300 U0301