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Conditions for Setting the DTC

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

DTC B257B 03

DTC B257B 07 

The BCM detects a short to voltage in the instrument panel dimmer switch signal circuit.

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