I have followed the instructions for GM cars 2017. Linked to internet waited 15 min and did repeat. I was able to connect and gather info and saw the read screen with completion bar the file was only 1,445 kb so i assume it was not going to download TCM program. After completion and save file the only screen that has any data is the fan settings all other boxes are empty (engine, DTC, etc). After multiple repeats I am able to link and scan the car and save the scan file. Help would be appreciated.