Medium Speed CAN Communication Bus (-) High

Check these first

• A short to voltage on the medium speed CAN negative wire
• A failed transceiver holding the medium speed CAN negative line high
• Harness damage shorting the medium speed CAN negative wire to power
• A faulty module on the medium speed CAN network

What to do next

1. Read the code and check module communication status on a scan tool
2. Measure medium speed CAN negative voltage with the key on
3. Test the medium speed CAN negative wire for a short to voltage
4. Unplug modules one at a time to see if the line returns to normal
5. Replace the module that holds the medium speed CAN negative line high
6. Clear the code and retest

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