Vehicle Communication Bus A

Check these first

• An open or short in the Bus A wiring
• Corroded or damaged Bus A connectors
• A failed control module dragging the Bus A down
• Incorrect termination resistance on the Bus A network

What to do next

1. Read the code and check for modules that are offline on a scan tool
2. Check the Bus A wiring for open and short faults
3. Measure bus resistance across the Bus A terminals
4. Inspect the Bus A connectors for corrosion
5. Isolate modules one at a time to find the one dragging the bus
6. Clear the code and retest

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