Severity: Moderate
Drivable, but it can cause more damage or poor economy. Get it checked within days.
What U0140 means
Lost communication with the body control module, which runs lighting, locks and many accessories.
Symptoms
- Lights, locks or wipers acting up
- No start on some vehicles
Common causes
Most likely first
- 1BCM power or ground
- 2Water intrusion in BCM connector
- 3Network wiring
How we diagnose it
- Check BCM powers, grounds and connectors
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.