Circuit/System Description
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The indicator has a series of LEDs that show in which range the transmission is.The device is controlled over a serial data bus by the body control module.
For an overview of the component/system, refer to:Instrument Cluster Description and Operation