U0140Severity: Medium
U0140 – Lost Communication With BCM
The vehicle can't communicate with the body control module.
What it means
Modules lose communication with the body control module (BCM) over the data bus. Comfort functions like lighting, locks, windows and the cluster can be affected.
Symptoms
- Comfort functions not working
- Gauge/lighting issues
- Multiple warning lights
Common causes
- CAN bus wiring fault
- BCM power/ground issue
- Faulty BCM
- Connector/corrosion
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Frequently asked questions
What does trouble code U0140 mean?
U0140 – Lost Communication With BCM. Modules lose communication with the body control module (BCM) over the data bus. Comfort functions like lighting, locks, windows and the cluster can be affected.
Can I drive with a U0140 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.