While the names are different, the process for GM's Plug and Charge is exactly the same as EVgo's Autocharge+. GM customers can enroll in GM’s Plug and Charge (and EVgo Autocharge+) using GM myBrand Enrollment.
GM customers can enroll at any time and don’t need to be at an EVgo charger to complete enrollment. Check out the app for your specific GM vehicle (like myChevrolet or myCadillac) for more details.