Invalid Data Received From Accessory Protocol Interface Module

Where it lives

For U0554, start at the module the description names.

Check these first

• A lost power or ground feed to the accessory protocol interface module
• Stale calibration or an outdated software load in the accessory protocol interface module
• Electrical noise on the data bus corrupting the accessory protocol interface module signal

What to do next

1. Scan all modules and record the stored and pending network codes
2. Check battery voltage and charging output
3. Repair or replace the accessory protocol interface module if the circuit, power, and bus tests pass
4. Clear the code and retest to confirm the accessory protocol interface module fault is gone

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