Circuit/System Description
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.
The radio communicates with the radio controls via serial data. This DTC indicates a fault in the radio controls. The radio may continue to respond normally to faceplate functions when this DTC is set.