OBD Codes List

Diagnostic reference · U023B

U023B

Lost Communication With Image Processing Module B

System
Network communication (U code)
Lamp
Check Engine Light
Category
Network Communications

What it means

U023B means Lost Communication With Image Processing Module B.

Where it lives

For U023B, the part to look at first is the module named here.

Check these first

  • A failed image processing module B
  • Corrosion or damage at the module B connector
  • A short or open in the module B harness
  • A software or protocol fault in module B
  • A failed camera or sensor in the system

What to do next

  1. Inspect the module B connector for corrosion or damage
  2. Test the module B harness for shorts and opens
  3. Check power and ground at module B
  4. Test the camera or sensor tied to module B
  5. Update the module B software if a fault is stored
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.