I brought my new 16 SIerra into the dealer yesterday to take care of a few rattles. One in the upper dash around the windshield and another that seemed to be under or behind the steering column or gauges. They called me a few hours later and said both were fixed under an existing bulletin. They added insulation to under the trim piece along the dash where it meets the windshield and the same bulletin called for insulation against an inverter under the steering column area. I don't have the bulletin number with me right now.
I haven't heard the rattle under the steering column again yet but the dash one is still there - sounds different now but still there so I plan to take it back next week.
Anyone else have experience with these rattles?