OBD Codes List

Diagnostic reference · U023D

U023D

Lost Communication With Front Distance Range Sensor - Left

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

What it means

U023D means Lost Communication With Front Distance Range Sensor - Left.

Where it lives

For U023D, start at the sensor the description names.

Check these first

  • Damage to the wiring or connector between the left front distance range sensor and the computer
  • A failed left front distance range sensor
  • Corrosion or water at the sensor connections
  • The sensor fitted or mounted wrong
  • A software or firmware fault in the computer

What to do next

  1. Inspect the left front sensor connector for damage or corrosion
  2. Check the sensor face for damage or obstruction
  3. Test the sensor wiring to the computer for shorts and opens
  4. Scan for other codes tied to the distance sensor circuit
  5. Replace the left front distance range sensor if it does not report
  6. Clear the code and retest

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Updated

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