U0140 Lost Communication With Body Control Module

Network Severity: Moderate Generic OBD-II

A module cannot communicate with the body control module.

Common causes

  • BCM without power
  • Network wiring problem
  • Faulty BCM

Symptoms

  • Lights, locks or wipers not working
  • Warning messages

What to check

  1. Check BCM fuses and grounds
  2. Check network wiring

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for U0140, follow the service information for that make and model.