U0140
Medium SeverityLost 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
- β οΈInterior lights not working
- β οΈPower windows/locks inoperative
- β οΈAlarm issues
- β οΈMultiple warning lights
Common Causes
BCM fuse blownlikely
CAN bus wiring issuepossible
Failed BCMpossible
How to Diagnose U0140
- 1Check BCM fuses
- 2Inspect BCM connector
- 3Check CAN bus wiring to BCM
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Shop OBD2 Scanners on Amazon βFrequently 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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