Vehicle Communication Bus D (+) Low

Check these first

• A short to ground on the bus D (+) wire
• A module on bus D pulling the (+) line low
• Water in a connector bridging the bus D (+) line to ground
• A partially shorted accessory on the bus D (+) circuit

What to do next

1. Read stored codes on every module that shares bus D
2. Measure the bus D (+) line for an unwanted path to ground
3. Check bus D (+) connectors for water or corrosion
4. Disconnect added accessories to see if the bus D (+) line recovers
5. Replace the module holding the bus D (+) line low
6. Clear the code and retest

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