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 B260D 02
The BCM detects a short to ground in the left daytime running lamp control circuit.
DTC B260E 02
The BCM detects a short to ground in the right daytime running lamp control circuit.