Squeaky belt or pulley on 6.2 HC

FishHuntRepeat · September 7, 2019

Picked mine up today, they couldn’t fix the noise....they could repeat the noise but couldn’t repair. Here are the notes. They started aTAC case and I asked how to check in on any progress, they told me it was internal with GM and they would update me when there is information. Upside....they aligned my bed and it looks better.....down side they scratched my door and it has to go back to the body shop

Wheelguy · September 7, 2019

15 hours ago, BeardBros said:

Update 9/6/19. I got my truck back last week on 8/28/19 with the new transmission. It did not fix the problem. I still hear the squeak, it is much less pronounced but I still hear it. So we decided to run the truck for a few thousand miles and see how the squeak progresses, then we will reassess it. My dealerships service dept. is top notch and they mostly work on trucks which is 75% of their sales so they know them well. I personally know all the mechanics and the owners of the dealership as I do business with them on a daily basis, so I can trust everything they tell me about what is going on. We are going to keep working on finding the source of the squeak and I will update this thread as we go along. I love the truck and everything else about it is great. So for right now I just have to crank Metallica everywhere I go, which isn't a bad thing.

Sorry to hear that. My dealership told me it’s the pressure control valve & found it using chassis ears. Might be worth it to have them try that if they haven’t already when you take it back in.

Edited September 7, 2019 by Wheelguy

Wheelguy · September 7, 2019

41 minutes ago, FishHuntRepeat said:

Picked mine up today, they couldn’t fix the noise....they could repeat the noise but couldn’t repair. Here are the notes. They started aTAC case and I asked how to check in on any progress, they told me it was internal with GM and they would update me when there is information. Upside....they aligned my bed and it looks better.....down side they scratched my door and it has to go back to the body shop

I’d urge you to have your dealership to try using some chassis ears on the PCV pipe & see if that’s from where the noise is coming. See my other posts in this thread. Nothing in your report shows they used those find the source of the noise. Not implying everyone is having the same issue but would be nice for them to check it out. If they can’t, take it to a dealer that can.

Edited September 7, 2019 by Wheelguy

Trwtow · September 8, 2019

On 9/6/2019 at 7:59 AM, BeardBros said:

Update 9/6/19. I got my truck back last week on 8/28/19 with the new transmission. It did not fix the problem. I still hear the squeak, it is much less pronounced but I still hear it. So we decided to run the truck for a few thousand miles and see how the squeak progresses, then we will reassess it. My dealerships service dept. is top notch and they mostly work on trucks which is 75% of their sales so they know them well. I personally know all the mechanics and the owners of the dealership as I do business with them on a daily basis, so I can trust everything they tell me about what is going on. We are going to keep working on finding the source of the squeak and I will update this thread as we go along. I love the truck and everything else about it is great. So for right now I just have to crank Metallica everywhere I go, which isn't a bad thing.

took mine in for same problem squeal at start up,recalls and an oil change they tell me the sqeal is normal and they r changing oil well they go to back it out truck wont move trans problem..i now drive a 4 cyl Silverado while my 6.2 high country rests

Sierradenali123 · February 20, 2020

Anyone find the source of the problem? Has anyone changed the pcv to see if the sound is reduced? Two different GM engineers have looked at my truck at different times and cannot duplicate the problem. GM has not referenced the pcv issue as a potential source. As you all know, it is easily heard when fluttering the pedal or under load and low rpm. GM will also not allow me to talk to the engineer or show them a video. It is obvious to me GM knows exactly what the problem is but do not want to fix it. I cannot imagine the problem will go away by itself.

Edited February 21, 2020 by Sierradenali123
Update

Moledigger2019 · February 21, 2020

My 5.3 l84 also makes this noise. Any one know where this pcv pipe is located.

clowe1243 · February 22, 2020

Subscribing (19 6.2 HC). I have a catch can system and it still happens. Doubt its PVC at all. To me it sounds like pulley or compressor.

Eljeffe316 · April 16, 2020

Anyone have any details on this one? Having same issue and looks to be hard to isolate... also agree it sounds like a pulley. 6.2 10sp HC

Mikedfw · April 16, 2020

Mine does this too, goes away after about 20 seconds, would like to know if anyone figures it out.

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Jav_eee · April 17, 2020

They all do this. Listen to exhaust videos on YouTube. Every damn one of them has this noise on startup.

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GMCustomerService · May 6, 2020

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Eljeffe316 · May 15, 2020

Bumping this one up... anyone find a solution to the noise or get an answer from GM?

SilentSierra · May 15, 2020

I’m having the same squeaking sound (really bad at start up and disappears after 20 seconds)...doesn’t totally disappear and can be heard at light throttle or sitting in a drive through next to a brick building. Surely there is a fix for this! 2019 6.2 AT4

Jav_eee · May 15, 2020

I’m having the same squeaking sound (really bad at start up and disappears after 20 seconds)...doesn’t totally disappear and can be heard at light throttle or sitting in a drive through next to a brick building. Surely there is a fix for this! 2019 6.2 AT4

Get under your truck at startup and you might find it coming from the driver side middle area. I’m guessing that’s the fuel whatever making the noise? That’s where mine comes from anyway.

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Sierradenali123 · May 15, 2020

GMC is ignoring the issue for me. They will not acknowledge that there is a sound. On my engine I beleive it is coming from the exhaust header at the motor. Has anyone replaced the exhaust to fix the problem?