Invalid Data Received From Lighting Control Module - Rear B

Where it lives

For U0553, start at the module the description names.

Check these first

• A fault inside the lighting control module rear B itself
• A loose, corroded, or water damaged connector at the lighting control module rear B
• An open or short in the lighting control module rear B wiring to the module that receives its data
• A lost power or ground feed to the lighting control module rear B
• Stale calibration or an outdated software load in the lighting control module rear B

What to do next

1. Scan all modules and record the stored and pending network codes
2. Check the lighting control module rear B data bus wiring for opens, shorts, and chafing
3. Confirm the lighting control module rear B reports correct live data on the scan tool
4. Check battery voltage and charging output
5. Repair or replace the lighting control module rear B if the circuit, power, and bus tests pass
6. Clear the code and retest to confirm the lighting control module rear B fault is gone

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