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Squeal during startup using auto start/stop.

Brian Hardwick
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Brian Hardwick New Member

Brian Hardwick

Posted
Posted

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 Enthusiast

AD80

Posted
Posted

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.

truck_newbie Enthusiast

truck_newbie

Posted
Posted (edited)
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 by truck_newbie
  • 2 months later...
TeamDagger Enthusiast

TeamDagger

Posted
Posted

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.

  • 1 year later...
  • 10 months later...
Transient Senior Enthusiast

Transient

Posted
Posted (edited)

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 by Transient
  • 5 months later...
JoeyPottie Enthusiast

JoeyPottie

Posted
Posted

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 Senior Enthusiast

GMCustomerService

Posted
Posted
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.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
Privacy Statement | General Motors
Your privacy is important to General Motors. This Privacy Statement addresses the personal information GM collects and how GM handles that personal information.
www.gm.com
 

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    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Ok I missed that part that yours is a GM. The strange part is that the choice for year ranges and within the year of 2026 is different on the Sierra then on the Chev for some reason as I am looking at my tool at the Sierra choices. Now I am guessing you see as to your sensor part number as it may be different on your truck for some reason and a call to GM should get you the part model number of the sensors you should have as well as which MHz your sensors are. I know mine are the ones as per what I listed but there are other choices in the Autel and got me wondering if by some chance they put different ones in your truck. Having said that, did you try using each of the choices starting from No 1 and going on down the list, not sure if that would mean shutting off the engine each time and resetting the tool and going at it again each time. Also I thought of something else which may sound retarded but if there was some stupid chance that the chev choice would work. The reason I say that is that the Sierra is showing a range up to 06/2026 for the various choices of sensors it could be where as the Chev has one choice that has that 12/2026. By the way it is possible to not run the truck and you may know that as per not pressing the brake but pressing and holding the start button for a few seconds and it lights up the dash ( its called service mode ) but that sucks battery power and if it were me doing it that way I would be throwing on a decent sized battery charger before doing it that way as killing your battery won't make you happy at me at all !.    Like I say, just a thought to try the Chev choices if you have already exhausted the Sierra choices but first it would be nice to know for sure what exact sensor model and hertz your truck uses as I assume only those choices that mention the sensor would work unless a choice that does not mention the sensor model would somehow work. Its frustrating when one is trying to use tools like this without the experience of the tool and the vehicle, as I am sure dealer techs themselves struggle with it when starting out or a new model year comes along that is slightly different. 
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      I tried before I updated the scan tool just incase an update messed it up, but it never worked so I updated the scan tool and it still didn't work.   Only difference is I click on Sierra not Chevrolet cause I have a Sierra.   If I click on 2026-2024 I didn't have any option to change placard, when I click on 2023 it does give me the option but when I try to do it,.it says vehicle not supported!   I have my region or market or whatever it is set to America I think, is that what yours is set to?
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Its just that it worked on 2024 trucks on this forum and my 2025 model truck, unless GM did something since that point to screw up access or Autel has a bad update. I haven't had need to use my tool since last year when I did the changes to the placard pressure settings and since then I updated the software on my Autel but have not plugged into the OBD so hard to say if I would get a surprise as well.    All I know last year when I bought the Autel I was warned to be sure to update it before I tried using the unit as they said who knows how long ago unit itself was actually manufactured as the software could be way out of date. 
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      And so you had gone through the process of registering and updating the tool and so on ?. All I can say is that on the front page as the tool fires up you go to advanced mode, then vehicle model comes up and you choose Silverado ( not the DRW or EV  since your a single rear wheel ) , then I think its choice 2 which is 07/2021 - 12/2026 ( 433mhz 13542523 ) as that is the series of tpms sensors and then go down to choice 5 which is tire type/pressure selection. Hit yes and it says to connect to OBD port and turn ignition on.    Having said this, I updated the software in my tool lately and these year range choices look different from the past due to them doing some updates it would appear and I have not connected up to the OBD port since last year so hopefully I am not in for a surprise with them screwing up the software and that it won't work on my truck anymore either.    So my question is, when you plugged into the OBD and started your truck it had that message on the Autel screen "vehicle not supported" ?. That does seem odd as tire shops would be pissed right off if hey can't use their tool on the model year after mine that in theory is supposed to be much the same truck ... unless GM did some change in the computer system to block certain things from access. 
    • Atlas
      Tire psi

      By Atlas · Posted

      Understanding and using modern scan tools is its own body of knowledge. I had little hope that would work...programming access to the BCM is probably required and that is not easy for us consumers. Expensive scan tool, GM programming subscription, online authentication, etc.   It also may be a matter of finding the right dealer to program it for you. Flashing a modern BCM might be a little too advanced for most tire shops.

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