Puttering around on the internet, I happened to stumble across a website offering the GM specific scan tool the techs use called the Tech 2 without having to shell out a good chunk of change. The install is complicated and poorly instructed but seems to be the bee's knees once it works. I haven't purchased the OBD2 interface yet but the program operates exactly like the real scan tool does. The website is www.vxdiagshop.com
, and the tool even supposedly offers ecm programming. I scrolled through the menus to double check, and sure enough the vibe was there so it should work! It might even work with matrixes as well. If anyone else has experience with the VXDiag or the program Tech2Win I'd love to hear your opinion.