I've been researching if the radio anti theft system will require a code. Some contributors said GM hasn't used radio codes since the '90s. People elsewhere say you have to call in with your radio serial number and if you can't locate it you would have to pull the screen to find it on the back. Others say it is in imbedded in the VIN. So, what has been your experience when you changed your battery? My 2017 has 60,000 miles on the original and may act up any time. I've gotten good service from AC/Delco.