Invalid Data Received from Switch Input Module “B”

Where it lives

For U04BB, the part to look at first is the module named here.

Check these first

• An open or short in the switch input module B wiring to the module that receives its data
• A lost power or ground feed to the switch input module B
• Stale calibration or an outdated software load in the switch input module B

What to do next

1. Scan all modules and record the stored and pending network codes
2. Test the switch input module B power and ground feeds under load
3. Repair or replace the switch input module B if the circuit, power, and bus tests pass
4. Clear the code and retest to confirm the switch input module B fault is gone

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