Low battery voltage. A blown fuse or bad ground to the BCM. Water damage (BCMs are often under the dash or near a door). A failing BCM.

Trouble codes › U0140

U0140 Lost Communication With Body Control Module

Q: What does U0140 mean?

U0140 means other modules have lost communication with the body control module, which runs lights, locks and wipers. Another module on the network stopped hearing from the body control module (BCM), which runs lights, locks, wipers and other body electronics.

Network

U0140 means other modules have lost communication with the body control module, which runs lights, locks and wipers.

Another module on the network stopped hearing from the body control module (BCM), which runs lights, locks, wipers and other body electronics.

Can I keep driving? Yes, but get it fixed soon.

Lights, wipers, locks or the security system may not work. Make sure headlights and wipers work before driving at night or in rain.

Common causes

Low battery voltage
A blown fuse or bad ground to the BCM
Water damage (BCMs are often under the dash or near a door)
A failing BCM

Symptoms

Lights, locks or wipers not working
Several warning lights
No start on some vehicles (security system)

What to check first

Check the battery and connections.
Check BCM fuses and grounds.
Look for water leaks into the area where the BCM is mounted.
A replacement BCM usually needs programming.

What does U0140 mean on your vehicle?

The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about U0140

No scanner? Most auto parts stores read check-engine codes for free.

Related codes

General guidance for U0140 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.