Quote Originally Posted by Aeroheadcww View Post
This ended up being a bad BCM. I bought one on Amazon (http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1). The replacement part numbers were changed a few times but the final part number for mine was ACDelco 15942206, which was a generic replacement for many GM cars that has to be programmed by a dealer. I replaced it myself, and after you go through the security relearn procedure you can drive it to the dealer. My dealer charged around $80 for the reprogram, and the only issue I have with it is that the door locks cycle twice when you put the car in reverse instead of just locking like it is supposed to.

The dealer told me that it was my alternator, and assured me of that. They were wrong, and I spent $200 on an alternator that I don't need. I am sure that they would have charged me a lot more and came up with the wrong diagnosis again and again if I had left it up to them. Beware of lazy mechanics, its hard to find one that will actually research and investigate an issue like this.

First off, thanks for your reply as I've searched in many areas and you're the only one to have the same issues. That being said, did you change your BCM due to it being an annoying false alarm ot did you run into other issues? More recently, I'm getting the "service vehicle soon" error on my DIC. I only got this error before when I unplugged the small ground line near the battery. It seems to be an issue related to the ground either on the BCM or at the main location on the vehicle.

How hard was it do pop the BCM in and re-learn? Any input is greatly appreciated as every mechanic has wrongly diagnosed it. Really trying to avoid the stealership.