Squeal during startup using auto start/stop.

[Brian Hardwick]

I have a 2019 Sierra 1500 6.2L.  The truck started making a very annoying sound when it starts during auto start/stop.  The sound is hard to explain but I would call it a squeal. It is kind of high pitch.  At first I thought it was a belt but I don’t believe that is the case.   It only does it when the auto start/stop starts it.  During a normal start it doesn’t do it.  I also think the truck is slow to start and a lot of times jerks as I hit the gas because it is still not 100% started.

 

I had the dealer check it while in for another issue and they said it is normal??      I try to remember to turn off the auto start/stop anyway, but is this normal?  Anyone else have this?   

[AD80]

I try to turn it off as soon as I get in too, but half the time I forget.  I wonder if there’s a way to set it to stay off so it won’t keep resetting every time I shut the truck off.

[Sin City Trail Boss]

My guess, maybe the exhaust flapper.

 

My truck does it every time it goes from V4 to V8.

[truck_newbie]

On 10/9/2019 at 6:55 PM, Brian Hardwick said:

I have a 2019 Sierra 1500 6.2L.  The truck started making a very annoying sound when it starts during auto start/stop.  The sound is hard to explain but I would call it a squeal. It is kind of high pitch.  At first I thought it was a belt but I don’t believe that is the case.   It only does it when the auto start/stop starts it.  During a normal start it doesn’t do it.  I also think the truck is slow to start and a lot of times jerks as I hit the gas because it is still not 100% started.

 

I had the dealer check it while in for another issue and they said it is normal??      I try to remember to turn off the auto start/stop anyway, but is this normal?  Anyone else have this?   

You should look at this thread, could be related. It seems to be happening with the 6.2 w/10 speed. No one is quite sure what is going on. I'm having the same issue but I've chosen to ignore it since they can't figure it out. I don't use auto start/stop anymore and now i only hear it sometimes when i start my truck. It's not the flappers. I thought mine was coming from the flappers too. 

 

Edited October 11, 2019 by truck_newbie

[TeamDagger]

My 19 Silverado 5.3 is at the dealer right now for this. Even during idle there is a squealing when slowing to a stop at a red light, starting and stopping the truck it also happens. The service engine light came on when this started happening. When I shut it off the is a noise seconds after with nothing moving.

[Seth barrett]

Any update my 2021 does this?

[JoshRM]

Any update? Mine is doing this as well

[Transient]

It's the serpentine belt.  There is a pulley that is very slightly out of alignment with the others.  It came that way from the factory.  It'll go away with a little wear on the belt.

Edited January 25, 2022 by Transient

[JoeyPottie]

NEED SOME HELP PLEASE , I'm having the same problem with my 2022 Chevy trail boss. squealing on start up in the morning or if it sits for a few hours. took it to the dealer 2 times and they cant here anything. I have done a lot of research and I'm not the only one with this problem, but no one is really posting the fix.   

ATT00002.htm

[GMCustomerService]

On 7/18/2022 at 11:47 AM, JoeyPottie said:

NEED SOME HELP PLEASE , I'm having the same problem with my 2022 Chevy trail boss. squealing on start up in the morning or if it sits for a few hours. took it to the dealer 2 times and they cant here anything. I have done a lot of research and I'm not the only one with this problem, but no one is really posting the fix.   

ATT00002.htm 25.15 kB · 3 downloads

This is certainly not what we like to hear, JoeyPottie.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2022 Chevy Trailboss. To do so, please send an email to [email protected] with ATTN: JoeyPottie/GM Trucks in the subject line.

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