OBD2 Car ScannerWhat does U0140 mean?
U0140 stands for Lost Communication With Body Control Module. Two or more of the car's computer modules are not communicating properly over the vehicle network (CAN bus).
Network codes cover the communication between the car's computer modules. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Low or weak battery
- Damaged network wiring or connector
- A module that has lost power or failed
- Aftermarket accessories interfering with the network
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does U0140 mean?
U0140 means “Lost Communication With Body Control Module”. It belongs to the network communication group: Two or more of the car's computer modules are not communicating properly over the vehicle network (CAN bus).
Is it safe to drive with U0140?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear U0140?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- U0135Lost Communication With Differential Control Module Front
- U0136Lost Communication With Differential Control Module Rear
- U0137Lost Communication With Trailer Brake Control Module
- U0138Lost Communication With All Terrain Control Module
- U0141Lost Communication With Body Control Module A
- U0142Lost Communication With Body Control Module B
- U0143Lost Communication With Body Control Module C
- U0144Lost Communication With Body Control Module D
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.