Horn honking & lights flashing at random

What does bcm mean?

bcm/Body control module. Can you check for applicable trouble codes? Some of the national brand auto stores will check codes for free.

Thank you Jim, I'll give that a try. ;-)

I just took my truck to the dealership it is a 21 chevy trail boss for this same issue. They said they could not duplicate the problem. I left the dealership and at my first stop I put it in the park and the horn beeps after a few minutes. Let me be clear, this is not the you left your keys in the truck multiple honk alert. A little later I left and came back and at this time it was dark and while sitting there my blinker starts flashing but it doesn't show it to be flashing on the display. I was looming at my emails a bit later and noticed I had a warning that I had a low tire. This same tire has had a slow leak that I need to get fixed just haven't had the time to do so. The last oil change wI got they added air to that tire an the best I can recall it stopped honking for a while after that which leads me to believe that it is a good possibility all of this is tied to having a low tire. I will put the recommended amount in the tire and update this post if it is indeed the problem.