Hi my fellow TBer's, newbie here. I googled my issue and it lead me to this site, so here I am. Bought my new Trailblazer 2 months ago, really enjoying it. Strange thing happened last month and today...when I shut off the Auto engine stop, a loud crackle sound came through the radio. Scared the heck out of me both times! The 1st time it happened I wasn't sure if it was my XM, and just a coincidence that I shut off the engine stop at the same time..but today it did the same. I called the dealer where car was purchased, they said they never heard of this happening. Said if I want to stop by and they would take a look at it. I saw a few posts on here about the popping noise, but it had to do with braking. Has anyone else had this happen with the Auto shut off? Thanks in advance.