Pressing the button will take you to the GM website page for scan tool purchase information.
The Excel file linked below will assist you in determining the Diagnostic tool that applies to a vehicle you are servicing.

GM – Using GDS2

GM Tech Line Connect Set Up

GM SPS Programming

GM Tech-2 update

GMDiagnosticToolVehicleApplication

Diagnostic Tool subscription pricing is displayed on the main brand page
Service Programming Fee information is displayed on the main brand page.