No Start....
Good evening:
I am a newbie, from Ontario Canada and would offer the following for you to try, it works like a charm for me, and, I will tell you how I came to get the info.
Last year, my 01 GT did it again, went to leave work and went home by thumb. This was after having spent almost 400.00 six weeks before for the same problem. I called the Good Mechanic (GM) dealer who advised I would have to wait for almost two weeks as they were booked solid. I am a quiet man, and somewhat patient, but not on that day. My answer was if I went over with the car the tail lights would be sticking out of his hind end.
I guess he took me serious, as he came back on, told me to go to my car, turn the ignition on, do not start, but leave as is for 15 minutes or so. That I did and, voila, started like a charm. No expensive keys, no expensive diagnostics, just 15 minutes with the key on. I should mention that you turn the ignition off, then right away restart the car, if it doesn't work, do it again. This guy guaranteed it would work. I have not had a single problem with this system since. So, it will cost you nothing to try, it is up to you but this is from real life experience.
Good luck,
Garnet