Conditions for Setting the DTC
WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
B3120 02
The keyless entry control module detects a short to ground on the passenger front door keyless entry antenna signal circuit.
B3120 05
The keyless entry control module detects a short to B+ or an open on the passenger front door keyless entry antenna signal circuit.