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U0140

Medium Severity

Lost Communication with Body Control Module

Network/Communication System

What Does U0140 Mean?

Communication lost with the BCM, which controls lights, locks, windows, and other body functions.

Common Fix

Repair wiring or replace BCM

Estimated Cost (DIY)

$0 - $400

Symptoms

  • ⚠️Interior lights not working
  • ⚠️Power windows/locks inoperative
  • ⚠️Alarm issues
  • ⚠️Multiple warning lights

Common Causes

BCM fuse blownlikely
CAN bus wiring issuepossible
Failed BCMpossible

How to Diagnose U0140

  1. 1Check BCM fuses
  2. 2Inspect BCM connector
  3. 3Check CAN bus wiring to BCM

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Related Codes

Frequently Asked Questions

What does the BCM control?
The Body Control Module manages interior lights, power windows, door locks, wipers, alarm system, and other body electronics.
Can I drive with a failed BCM?
The engine usually runs, but many comfort features will not work. Headlights and wipers may be affected β€” exercise caution.

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