This morning I tried programming a 2006 Trailblazer SS. The flash looked like everything was ok. Went to fire the truck and nothing. I tried to do it again and it said it was locked. I had a local tuner do some tuning with HP tuners for an sts turbo I put on but if he locked it, would I even be able to read it to begin with? I am kind of new to this at least with LS2's.