Lost Communication With DC/DC Converter Module
The U0208 code means the vehicle's onboard diagnostic system has detected: Lost Communication With DC/DC Converter Module. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $600 - $2,000 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- 12V battery not charging
- Multiple warning lights on dashboard
- Vehicle accessories losing power
- Battery dead after short drive
- System voltage warning displayed
Probable Causes (Ranked by Likelihood)
- Failed DC/DC converter Very High
- 12V battery failure causing communication loss High
- Wiring fault to DC/DC converter module Moderate
- High-voltage supply issue to converter Low
Step-by-Step Diagnostic Procedure
-
Test 12V battery voltage and condition
-
Check DC/DC converter output voltage
-
Inspect wiring to DC/DC converter module
-
Verify high-voltage supply to converter
Frequently Asked Questions
Can I drive with U0208?
No. The DC/DC converter charges the 12V system. Without it, accessories fail and the vehicle may stall.
What causes U0208?
Most commonly a failed DC/DC converter. A dead 12V battery can also cause communication loss.
How much does U0208 cost to fix?
Typically $600 to $2,000.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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