just wanted to come back here and post an update in case people need help in the future. I went to the dealer yesterday. Of course being one month over the 36 mo bumper to bumper warranty, but 10k under miles, They did nothing to help. Excuses were plentiful and of course it's gm's fault. Even to go as far as saying the time and miles of the warranty are 2 separate things so pay the $165 diagnosis fee and get the $500 work done and then we'll send it in to gm and see if they'll reimburse you. (side note: when he saw I was clearly annoyed that I had to pay a month before I turned the truck in, he started making up more lies, like "well, the part is $300 so we're not charging you much in labor". I also asked for an itemized estimate for the $500 work and they said it's in the paperwork. Only the amount was there, not what they needed to do or part numbers. So, I paid the diagnostic fee and left. When I went home, I read the receipt they had given me for the diagnostics and it was clear they thought it was the drivers door harness that was bad. I proceeded to remove the door panel and removed the harness and started carefully peeling the tape of the harness that is inside the boot that goes from the door to inside the car itself. Wasn't long before I saw 2 totally broken wires, both leading to the side crash sensor. From 3 years of opening and closing the door, the wires couldn't hold any longer. I've heard this happening to different cars over the years, but this is the first time it happened to me. I spliced in about 2 inches of wire to each broken wire, so hopefully it will have enough slack not to break. Just put everything back together and all seems to be well. The part is $185 from gm, and some online retailers have it for about $120, NOT $300. The part number is on backorder with an unknown ETA or I would've just picked one up and replaced the whole thing... Hopefully this will help someone that wants to save $650 in the future....