Super annoying. About to take my truck back in again for the same thing. Nothing really seems to affect it, i.e.. temperature, speed, etc. It always does it the exact same place for me, decel 25-20, regular mode, sport mode, doesn't matter.
I have the exact same issue, brought it up on here as well. 2019 with 8 spd and 5.3. Happens on decel between 25-20 mph like clockwork. Not an actual vibration you can feel per se, but more of a cabin reverberation. Weird, but bery noticeable, except for the tech that checked it out of course.
I hate the a/c dripping on the pipe! My son gets out and says my truck is cooking bacon again because of the sizzling noise.
Found out this morning, if youre an idiot and leave your turn signal on, it will start dinging at you and a msg will come up in the DIC to tell you to turn it off.
I know where you're coming from. If I adjust my seat to comfortably use the gas pedal, I sometimes hit the side of the brake as well. Its not just a simple "heel pivot" over to the brake. I really have to lift back and over, if that makes sense.
If you're close, I highly recommend Carter Chevrolet in Okarche, OK. They will beat any price, will deliver, no fancy showroom, just a bunch of good dudes in shorts. Don't do GMC though, only Chevy.
So I have the headreast rattle issue but I also have the B pillar rattle. I think the B pillar is the little plastic caps that cover the screws. I assume that's what they are; they are the 2" by 2" square pieces at the top and bottom. If you lightly tap them, they move around a lot. I think they may be the culprit.
Sorry, just saw the request for pics, but mine looks identical to the pics posted on the previous page, i just put the hose clamps on the outboard sides of the white mounts. Still holding.
Since there is no GM fix yet, I'll post again what I did. I bought a set of screw type hose clamps and lined the inside with rubber from an old bike tube. I put these hose clamps on the rod the seat mounts to and butted them up against the while seat mounts on the outboard sides. Tightened them down and have had no issues for a few months now. Works until GM figures it out.
Haha, my dealer referred to it as "it looks like a Pawpaw truck." It was actually one of my first choices but then I saw in person and wasn't for me though.
I was messing around with my moving seat as well and noticed all my seat cushion movement is in those white clamps as well. Was going to try the hose clamp idea too; glad to see someone else has done it with some luck.