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Code

U0140

Network

Lost communication with body control module

Modules cannot communicate with the body control module.

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Most likely causes

BCM power or ground fault
CAN wiring fault
Failed BCM

Symptoms you may notice

Wipers/lights/windows act up
Many warning lights

Checks to run

Check BCM fuses and grounds
Test CAN wiring
Scan the BCM

Tools you may need

Multimeter OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Network

Lost communication with engine control module

Lost communication with ABS control module

Lost communication with transmission control module

High-speed CAN communication bus

Control module communication bus off

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