High Speed CAN Communication Bus

Check these first

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

What to do next

1. Read the code and check for modules that are offline on a scan tool
2. Check the high speed CAN wiring for open and short faults
3. Measure bus resistance across the high speed CAN terminals
4. Inspect the high speed CAN 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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