U0299
Lost Communication With DC/DC Converter Control Module B
U0299 is an OBD-II diagnostic trouble code meaning: Lost Communication With DC/DC Converter Control Module B. Common causes: open or short circuit in the communication circuit, malfunction of dc/dc converter module b. Estimated repair cost: $167–556.
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
Error U0299 by Vehicle Brand
FAQ
What does the U0299 code mean?
U0299 is an OBD-II diagnostic trouble code that indicates: Lost Communication With DC/DC Converter Control Module B
What causes a U0299 error code?
The most common causes of U0299 include: 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.
How do I fix a U0299 diagnostic trouble code?
To fix U0299: 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. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0299?
Limited driving only, diagnose soon
How much does it cost to fix U0299?
The estimated repair cost for U0299 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat