OBD
B0129
DC/AC Converter A High Voltage Power Outlet “C” Circuit/Open
What it means
B0129 means DC/AC Converter A High Voltage Power Outlet “C” Circuit/Open.
Check these first
- An open in the converter A outlet C high voltage feed
- A blown fuse or open relay feeding outlet C
- A damaged outlet C pin or connector
- The converter A is not energizing outlet C
What to do next
- De-energize the high voltage system before testing
- Check the fuse and relay feeding outlet C
- Inspect the outlet C connector for damage
- Test the outlet C high voltage feed for an open
- Replace the converter A or outlet C harness if faulty
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.