Invalid Data Received from Switch Input Module “C”

Where it lives

For U04BC, start at the module the description names.

Check these first

• Electrical noise on the data bus corrupting the switch input module C signal
• A low battery or charging fault that browns out the switch input module C
• A fault inside the switch input module C itself
• A loose, corroded, or water damaged connector at the switch input module C

What to do next

1. Scan all modules and record the stored and pending network codes
2. Confirm the switch input module C reports correct live data on the scan tool
3. Check battery voltage and charging output
4. Repair or replace the switch input module C if the circuit, power, and bus tests pass
5. Clear the code and retest to confirm the switch input module C fault is gone

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