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Conditions for Setting the DTC

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

B3121 02 

The keyless entry control module detects a short to ground on the rear fascia keyless entry antenna signal circuit.

B3121 05 

The keyless entry control module detects a short to B+ or an open on the rear fascia keyless entry antenna signal circuit.

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