Upper Dash Rattle

[Dugg]

2017 GMC Sierra SLT, 50K miles, great condition. Rattle just started. Appears to be coming from inside dash panel closet to window. 
It’s not the bolt behind driver knee panel. HELP be4 I go insane 

[pgamboa]

Did you try removing the headlight switch trim and fuse panel cover? There are several 7mm Bolts there. Also, the cluster visor.


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[Dugg]

I’ll look into that. I swear it sounds like the dash vent panel near glass. I am about to take a sledge hammer to it. Thx, I’ll report back

[dmastber]

I had a sound similar and thought it was coming from the defrost vent, it sounded like a marble rolling around, it ended up being on of the screws that hold the overhead sunglasses had fallen out and was rolling around up there

 

dont know if that’s it but worth looking at

[Dugg]

Checked inside dash and glass holder. Not yet but I had a friend say it sounded like MAYBE it was coming from just other side of engine firewall. 
I will have to dig around some more. 

[Joppy818]

Did you resolve. I have noise coming from behind the radio aread- Have already Flock taped the defroster grill vent. What behind the radio? Just Ducts?

[NorEaster]

I have the same problem, took the dash trim off where the heater vent is and nothing. Did the sunglass overhead solve it?

[wgigs]

Seems to be a common problem which gm/chef doesn’t want to address. I cringe as soon as the cooler weather comes and contracts the clips/ insert causing them to rattle. Try this :  

 

[Dugg]

10 hours ago, NorEaster said:

I have the same problem, took the dash trim off where the heater vent is and nothing. Did the sunglass overhead solve it?

Nope. Next I plan to remove the forward dash panel - where defrost vents are. I’ve read/seen videos that show it is just clips but considering it’s a 2017 I’m apprehensive to attempt. It’s that or go insane over noise. Keep u posted

[NorEaster]

I taped up my defrost vent clips which didn't solve it. Checked the sunglasses screws, nothing there. Tightened the knee bolster screws on the driver side, and checked the screws on in the glove box where they remove them to change the cabin filter. I still cannot figure out this rattle and it is driving me insane.

[Hdwrguy]

Remove the cover for the radio and you will see the two electronic boxes in there (one is the radio, not sure about the other one) and then you can see many 7mm screws.  Tighten them all.  Also get some foam and jam it under the electronic boxes so they do not move.  Also pull your instrument cluster where you can set it on your dash.  Tighten all of those 7mm bolts as well.  

 

Also, a footnote.  If your air inlet grille panel has loose rubber, it can tap on the windshield and it will drive you mad.  Buy and install a new one, problem solved.

[gl9191]

I found the noise. There’s a support bar that hovers over the battery from the firewall side to the right fender. The bolt for it on the farther side of the firewall was loose. I tightened it back after checking out another form with this issue and that took car of the rattle from the dash. so far no more noise/chirp. "Goes to show noise will transfer oddly thru the vehicle."

Edited April 17, 2025 by gl9191
missing text

[Twobyfour]

On 4/17/2025 at 1:37 AM, gl9191 said:

I found the noise. There’s a support bar that hovers over the battery from the firewall side to the right fender. The bolt for it on the farther side of the firewall was loose. I tightened it back after checking out another form with this issue and that took car of the rattle from the dash. so far no more noise/chirp. "Goes to show noise will transfer oddly thru the vehicle."

I created an account just to say thank you to this guy. Saved me from going insane and I never would have figured it out.