Vehicle Communication Bus B (-) Open

Check these first

• An open in the Bus B negative wire
• A broken or corroded Bus B negative connector pin
• A module that has lost its Bus B negative connection
• Harness damage that cut the Bus B negative conductor

What to do next

1. Read the code and check module communication status on a scan tool
2. Test the Bus B negative wire for continuity end to end
3. Check the Bus B negative connector pins for corrosion or backing out
4. Measure bus resistance across the Bus B terminals
5. Repair the open in the Bus B negative circuit
6. Clear the code and retest

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