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Code

B1340

Body

Body control module software corruption

The body control module has a software fault.

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Most likely causes

Corrupted BCM software
Failed BCM
Low voltage during update

Symptoms you may notice

Random electrical faults
Lights behave oddly

Checks to run

Check battery and charging
Reprogram or replace the BCM

Tools you may need

OBD-II scanner

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

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