dakonthemountain

Oh boy!....... ? Well in conversation with the dealer (still under warranty) in "prep for Friday's service I was told... " hmmmm... well the alarm must have gone off". We will try to help you on Friday. THEN a neighbor just said to disconnect the battery to reset it. and it worked! Not sure how often this will happen or work, but I think I'll put a lever switch on the negative side of the battery for future use! Can't believe a truck as expensive as these are could do this and nobody can tell us why or how to permanently fix it! I'm so sick of this happening, but don't want to disconnect the horn. If anything changes I'll write back here. Cheers!

NO! and now it's doing it again. Has been for 4 days now!!! I have a service appointment this Friday and I "hope" it's still doing it then so THEY can figure it out! My neighbors in my quiet mountain town must just HATE me! Have you found out anything further?!

I am THRILLED to find out about the automatic folding mirror option using the key fob!!! Because I have the towing mirrors I always manually hit the button to open and close them. Unfortunately, I often forget to fold them in when I get out and have to go back. If I fold them before I get out of the truck then I have crack open the door and twist around to see behind me when parked on the street. NO MORE!! Yay!!!! So thanks to you guys for pointing this feature out ! Cheers! Dak

2018 Sierra Denali Extreme I had the same issue. I was gone for 10 days and upon return used my remote start option to ensure my battery was still charged (it was) and let it run until the automatic shut off after 15 minutes. Later I went out to get something out of it and the dreaded 3 horn honk happened (all 4 doors) I check online and the only thing I found was someone that said "it stopped after about 12 hours time".. Mine didn't, so I called the dealer today. Quote: "Never heard of that, unless the key fob is in the truck" (it wasn't) Was told to bring it in. Went out to my truck and low and behold it has stopped after 24 hours. Thank goodness! It was so annoying to me and my neighbors. Of course now when I bring it to the dealer for service it won't be doing that, so my only thought is that it may have something to do with the auto start feature.... but who knows?!! Anyway it's stopped for now!