OBD Codes List

Diagnostic reference · U025C

U025C

Lost Communication With Special Purpose Vehicle Control Module D

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

What it means

U025C means Lost Communication With Special Purpose Vehicle Control Module D.

Where it lives

For U025C, start at the module the description names.

Check these first

  • Damaged wiring between module D and the OBDII system
  • A failed special purpose vehicle control module D
  • Corrosion or water in the module or connectors
  • The module or its parts fitted incorrectly
  • A programming fault in the module

What to do next

  1. Scan the network and confirm module D is offline
  2. Inspect module D wiring and connectors
  3. Check the module and connectors for water or corrosion
  4. Verify module D is fitted correctly
  5. Replace special purpose vehicle control module D if faulty
  6. Clear the code and retest

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Updated

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