I know I keep harping on it, yes, it can diagnose just about everything. The Tech2 and the online or pdf manuals can solve most of the problems people have with these trucks. Many spend thousands on wheels or accessories, they can drop a few hundred on a scan tool that will save them precious time and pay for itself in no time.
Every GM auto enthusiast should have one, even the not so technical blokes so they don't get ripped off by thieves with wrenches. It should be like Roy Rogers and Trigger or Batman and Robin, or John Wayne and Westerns.