Exhaust Control Valve Learn: Description
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
For an overview of the component/system, refer to: Exhaust Tail Pipe Flow Control System Description and Operation
This procedure triggers the control module to learn the values of the component: M106 Exhaust Control Valve Actuator