FOUND MY DASH RATTLE

11bravoZ71 · January 25, 2022

Been chasing a very pronounced dash rattle directly behind the cluster for months. Almost Removed the entire dash and no luck. The interweb didn’t help much, never seen this before.

just earlier I removed the windshield wipers and plastic cover and found a really loose bolt. Under the wiper motor. Not tight at all. Had to use the impact because it kept spinning I assume there’s a nut on the other side. Now it’s tight. My cabin is now RATTLE FREE. 2019 CC z71 58k miles.

Edited January 25, 2022 by 11bravoZ71

Tahoe02 · January 25, 2022

Good find. Thanks for sharing and hopefully it will help someone else.

cltsig · January 25, 2022

Good job finding it. Rattles/creaks/squeaks are the worst.

In case somebody searches "rattle", I had one that drove me nuts. Thought it was the dash and so did the dealer, so they took it damn near apart. You could hear it better but it wasn't in the dash. It ended up being a wiring harness rubbing on the transmission bell housing. 10 minute fix. I understand after they found it, it went upstream to GM and they changed the manufacturing process so it wouldn't happen to others. Who knows if that happened though.

Edited January 25, 2022 by cltsig

11bravoZ71 · January 25, 2022

Absolutely it’s always great to post these finds for the next person. This rattle almost made want to trade this in lol. Thats how bad it was. Other then my 8speed reverse clunk hoping warranty fixes it. I would say having a permanent rattle that cannot he found is worse. I took apart almost everything and zip tied this and taped that etc. went underneath the dash taped a lot of wires etcc…. I even thought it was shocks. Rattles are evil and serve no purpose.

Edited January 25, 2022 by 11bravoZ71

lapoolboy · January 28, 2022

On 1/25/2022 at 10:21 AM, 11bravoZ71 said:

Rattles are evil and serve no purpose.

Other than entertaining babies...

RCMH · October 12, 2023

On 1/24/2022 at 11:01 PM, 11bravoZ71 said:

Been chasing a very pronounced dash rattle directly behind the cluster for months. Almost Removed the entire dash and no luck. The interweb didn’t help much, never seen this before.

just earlier I removed the windshield wipers and plastic cover and found a really loose bolt. Under the wiper motor. Not tight at all. Had to use the impact because it kept spinning I assume there’s a nut on the other side. Now it’s tight. My cabin is now RATTLE FREE. 2019 CC z71 58k miles.

Did it almost sound like the rattle was tapping on the windshield?

MrMagloo · October 12, 2023

4 hours ago, RCMH said:

Did it almost sound like the rattle was tapping on the windshield?

Bravo hasn't been online for 10 months. This is an old thread. I wouldn't hold your breath for a reply.

SC4R3C120W · October 12, 2023

23 minutes ago, MrMagloo said:

Bravo hasn't been online for 10 months. This is an old thread. I wouldn't hold your breath for a reply.

nothing wrong with bringing up old threads if it's a topic that doesn't get covered a lot. Also, a lot of these people haven't sold their vehicle, so they still remain on the forum. Maybe a year from now this, or my experience will help someone else.

Here's my story that happened last week:

I took my 3.0 duramax to get trans, brakes, and coolant serviced at 103k miles. While it was there, the dealer mentioned a Nox sensor issue that i OK'd to replace. When I got it back, I heard a rattle that seems like it was under my dash, behind the glove compartment. After it lasted a few days and drove me bonkers, I did a search to look for anyone else that had a similar issue. I then thought that since they were around my exhaust, I'd look there. Sure enough, tracing the new NOx sensor back, I found the wiring harness had plastic circular clips to hold it in place, but some were off and hitting against the frame. It was so weird for something that far under the car to cause a noise that sounded like it came from my dash. I lucked out that between me thinking this was an area the dealer touched, and the fact that everything was easily seen under the truck, made this doable. I was already researching from people doing stereo things how to take apart my dash as a worse case scenario. If things got to that point, i may have taken it back to the dealership, but it's hard for me to part with my vehicle, especially since it's no longer under warrantee. Troubleshooting and rental car adds up fast.

RCMH · October 12, 2023

4 hours ago, MrMagloo said:

Bravo hasn't been online for 10 months. This is an old thread. I wouldn't hold your breath for a reply.

Why does there always have to be one like you, comes naturally? Are the thread monitor? “OLD THREAD”…. Aren’t there threads on here where people ask questions about much older trucks? What are they supposed to do, not ask since it’s been covered 10 years ago?

Edited October 13, 2023 by RCMH
Response

RCMH · October 12, 2023

9 minutes ago, SC4R3C120W said:

nothing wrong with bringing up old threads if it's a topic that doesn't get covered a lot. Also, a lot of these people haven't sold their vehicle, so they still remain on the forum. Maybe a year from now this, or my experience will help someone else.

Here's my story that happened last week:

I took my 3.0 duramax to get trans, brakes, and coolant serviced at 103k miles. While it was there, the dealer mentioned a Nox sensor issue that i OK'd to replace. When I got it back, I heard a rattle that seems like it was under my dash, behind the glove compartment. After it lasted a few days and drove me bonkers, I did a search to look for anyone else that had a similar issue. I then thought that since they were around my exhaust, I'd look there. Sure enough, tracing the new NOx sensor back, I found the wiring harness had plastic circular clips to hold it in place, but some were off and hitting against the frame. It was so weird for something that far under the car to cause a noise that sounded like it came from my dash. I lucked out that between me thinking this was an area the dealer touched, and the fact that everything was easily seen under the truck, made this doable. I was already researching from people doing stereo things how to take apart my dash as a worse case scenario. If things got to that point, i may have taken it back to the dealership, but it's hard for me to part with my vehicle, especially since it's no longer under warrantee. Troubleshooting and rental car adds up fast.

Thanks for the intelligent and mature response.

Army Girl · August 22, 2024

Forewarning: Long post. Sorry.

I bought a 2024 Chevy Silverado LT 1500 4x4 in July. It had 5,700 miles on it when I bought it. The silence inside and quiet smooth ride were an answer to a prayer.

I took it into the dealership for a warranty oil change yesterday. It took hours! When it was ready for me to pick it up, I was told that a recall on the Serial Data Gateway Module had also been taken care of.

From what I've found online, the Serial Data Gateway Module is located way up under the dash and it's difficult to access.

I drove to run errands afterwards and there is now clicking and popping noises coming from the front dash. The brake pedal squeaks when I press it now and clicks when I let off of it. The gear shifter has a great deal of slack when in D and also a dull knock sound with that slack movement. The slack is significant enough that the shifter bounces when I drive over the groves in the center line of the road making the turn onto my driveway. This is something I have done daily since I got the truck in July and the shifter never bounced until after getting it back from the service department at the dealership yesterday.

I drive by myself with no radio on, and I'm a hypervigilant Veteran, so I have complete confidence the sounds were not there before taking it in for service.

Additionally, the steering wheel is slightly off center now, the airbag compartment in the center of the steering wheel can be physically moved side to side and top to bottom, and when it park, the steering wheel tilts off center to the left each time. I try to straighten it back to center, but it turns back to the left until I overcompensate to the right in order to get it to go back to center. This happens every single time I park now, regardless of where I park. Definitely not something that was happening before yesterday. I'm sure of this because I have several hours each day where it is necessary for me to sit parked and I prop my phone on the steering wheel. I 100% know for a fact that the steering wheel was straight and would stay straight when parking before yesterday.

Today, I went back to the dealership. I was told they didn't do anything to reprogram the Serial Data Gateway Module except plug in a cord and push buttons on the handheld screen, that the clicks and popping sounds I'm hearing now are normal, that the one associated with the brake pedal is the electric brakes and the clicking when I take my foot off the pedal should be happening, that the squeaking when pressing the brake pedal is normal, that all of these clicks and popping noises were happening before (they weren't), that I just didn't notice them, and that they didn't touch the steering wheel at all. There were residue marks on the steering wheel that were consistent with the size of fingers. Residue of palm prints on the door. Drops of something on the seat that left a white residue when I tried to clean it off. Pry maks from a tool on the plastic covers on the back of the steering wheel where you access the bolts to remove the airbag compartment. Drops of something on the plastic dash trim behind the steering wheel that had hardened by yesterday afternoon and had to be scraped off, and the hood of my truck was covered in some relatively large "drops" of a substance that looks like it was splattered across the truck. It hardened and didn't come off by trying to wipe it off with a cloth. When I washed it at the car wash, those spots repelled the water while the area with no splatter drops stayed wet.

By this evening, there is now a rattle coming from somewhere behind the dash and I can't figure out where. And the road noise is now very noticeable. I can't describe accurately enough how hypervigilante I am about noises. They are driving me crazy, especially when I know they weren't happening before yesterday.

I mostly needed to vent, but if anyone has any advice, I would greatly appreciate it.

cfell · September 8, 2024

Contact GM. I did lemon law in Texas for another manufacturer.., had to go to arbitration.. but they fixed it.

Edited September 8, 2024 by cfell

BEHUDSON · April 25, 2025

Hello all. I dealt with a dash rattle for months and ripped almost the entire thing apart with no luck. I searched along the firewall in the engine compartment as some others suggested and FINALLY located the source. There was a vertical bracket near the battery. The 13 mm nut and washer were loose I tightened them and problem solved. It is amazing the sound resonates into the dash like that. Hope this helps others.

R.C. · April 25, 2025

9 minutes ago, BEHUDSON said:

Hello all. I dealt with a dash rattle for months and ripped almost the entire thing apart with no luck. I searched along the firewall in the engine compartment as some others suggested and FINALLY located the source. There was a vertical bracket near the battery. The 13 mm nut and washer were loose I tightened them and problem solved. It is amazing the sound resonates into the dash like that. Hope this helps others.

Thanks for the response and glad you found yours. I finally decided to trade it almost a year ago. Several long stories that involved the service department where I purchased it. When I bought it in 2021 shortly after it had a wiring harness issue and that was the beginning of the end due inept “technicians.” Even the salesman gave me the “you didn’t hear this from me” speech and told me all the certified technicians left for another dealership.

Cochise · February 27

I found the rattling on my 2016 Chevy 2500HD. It was near the passenger side. I thought it was on the inside, it took the top dash off near the windshield and taped everything like others had said that stopped their noise, but it didn't stop mine. It was a squeaking noise, I was going insane, turn out it was under the hood, the brace on the passenger side, the screw was loose and squeaking like a MOFO. I tightened it up and, peace AT LAST. PS now my hair is growing back