U0140: Lost communication with body control module

Another computer on the network has stopped hearing the body control module. The driver may notice faults in lights, locks, wipers or the dashboard.

Likely causes, most common first

  • Weak battery or blown fuse
  • Damaged network wiring or connector
  • Poor ground at the module
  • Faulty body control module

Parts usually involved

  • Body control module
  • Fuse
  • Network wiring
  • Battery

Test before you replace

Check battery voltage, then test the module's fuses, grounds and network lines.

General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.

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