Question 1

What does U0140 mean?

Accepted Answer

U0140 - Lost Communication with Body Control Module. Communication lost with the BCM. BCM controls lighting, locks, windows, wipers, and many body functions.

Question 2

What are the symptoms of U0140?

Accepted Answer

Interior lights not working, Power windows/locks not working, Wipers not working, Multiple warning lights

Question 3

What causes U0140?

Accepted Answer

BCM failure, CAN bus wiring, BCM fuse blown, BCM connector corrosion, Water leak onto BCM, Aftermarket accessory interference

Question 4

How much does it cost to fix U0140?

Accepted Answer

Typical repair cost: $100-$1,200. BCM is usually under the dash on driver's side. Check for water leaks from windshield, AC drain, or door seals. Check fuses first.

U0140 — Lost Communication with Body Control Module

Don't guess — diagnose U0140 the right way

Common symptoms of U0140

Common causes of U0140

Repair cost & difficulty

Vehicles commonly affected

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