Vehicle Communication Bus D Performance

Check these first

• High resistance in the bus D wiring slowing the data transitions
• A module on bus D dropping messages under electrical load
• A loose shared ground among the modules on bus D
• Electrical noise from an added accessory coupling onto bus D

What to do next

1. Read stored codes on every module that shares bus D
2. Graph bus D traffic on a scan tool while the symptom is present
3. Test the bus D wiring for added resistance and loose grounds
4. Remove added accessories one at a time to rule out noise on bus D
5. Replace the module that drops off bus D under load
6. Clear the code and retest

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