Lost Communication With Running Board Control Module B

Where it lives

For U0251, start at the module the description names.

Check these first

• Damaged wiring or connectors between the main computer and running board control module B
• A failed running board control module B
• Water or corrosion at the module or connectors
• The module or related parts fitted incorrectly
• A software fault in the module

What to do next

1. Scan and confirm running board control module B is offline
2. Inspect the module B wiring and connectors
3. Check the module for water or corrosion
4. Verify the module is fitted and connected correctly
5. Replace running board control module B if faulty
6. Clear the code and retest

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