Invalid Data Received From Remote Accessory Module

Where it lives

For U0549, the part to look at first is the module named here.

Check these first

• A lost power or ground feed to the remote accessory module
• Stale calibration or an outdated software load in the remote accessory module
• Electrical noise on the data bus corrupting the remote accessory module signal
• A low battery or charging fault that browns out the remote accessory module
• A fault inside the remote accessory module itself

What to do next

1. Scan all modules and record the stored and pending network codes
2. Inspect the remote accessory module connector pins for corrosion, water, and looseness
3. Test the remote accessory module power and ground feeds under load
4. Check the remote accessory module data bus wiring for opens, shorts, and chafing
5. Repair or replace the remote accessory module if the circuit, power, and bus tests pass
6. Clear the code and retest to confirm the remote accessory module fault is gone

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