Instruction: Program 2021-2025 Chevrolet Cadillac GMC Buick new system smart keys (new style knife shaped key) using GM Techline Connect Software.  All 3rd party OBD tools (OBDSTAR, Autel, Lonsdor) cannot get the 24-digit security code for these new system models. The reliable and easier solution for now is Techline Connect programming. No pin code is […]