Zoeken
U0140
Systeem
Network (CAN Bus)
Scanner vereist
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Body Control Module

Understand U0140, common causes, and the right TOPDON scanner to diagnose it.

BCM not responding — affects lights, locks, windows, and security on many vehicles.

Veelvoorkomende symptomen

  • Multiple body electrical faults
  • No crank / security light
  • Random B-codes

Typische oorzaken

  • BCM failure
  • Water in BCM
  • CAN wiring
  • Low voltage

Welke scanner heb je nodig?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen TOPDON scanners

Veelgestelde vragen

What does U0140 mean?
U0140 indicates lost communication with body control module. BCM not responding — affects lights, locks, windows, and security on many vehicles.
Can I diagnose U0140 with a basic code reader?
U0140 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for U0140?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0140?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.