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6.2 Engine whine?

Greyhound6.2
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Greyhound6.2 Enthusiast

Greyhound6.2

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My 20 Sierra 6.2 has developed an engine whine, if anyone is familiar with "alternator whine" in the car audio world it pretty much sounds like that only outside in the engine bay, I could also describe it as the noise from an electric RC toy car (high pitch squeal) it is RPM dependent once warmed up and at idle it quiets down and is mildly audible but picks up quickly with the RPM's. any ideas what this could be? 

GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted
On 7/5/2022 at 10:58 PM, Greyhound6.2 said:

My 20 Sierra 6.2 has developed an engine whine, if anyone is familiar with "alternator whine" in the car audio world it pretty much sounds like that only outside in the engine bay, I could also describe it as the noise from an electric RC toy car (high pitch squeal) it is RPM dependent once warmed up and at idle it quiets down and is mildly audible but picks up quickly with the RPM's. any ideas what this could be? 

This is certainly not what we like to hear, Greyhound6.2.  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 20 Sierra 6.2. To do so, please send an email to [email protected] with ATTN: Greyhound6.2/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.
 
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Firehawk99 Enthusiast

Firehawk99

Posted
Posted

My 2021 6.2 Trail Boss always had a tick noise. I never had an check engine light come on and it always ran flawlessly.  My 2022 ZR2 also has the 6.2 and for some reason it us much quieter. No ticking noise at all. They both have DFM active. Who knows.

  • 1 month later...
Greyhound6.2 Enthusiast

Greyhound6.2

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Posted
On 7/14/2022 at 7:07 AM, silveradosid said:

have you tried removing the alternator belt to see if that is the problem. does it sound like power steering whine, if so you may have an oil pump failing

that is exactly what it sounds like 

 

BIGDOGx Senior Enthusiast

BIGDOGx

Posted
Posted

It is the oil pump imo, i have complained about mine for 7 years now, dealer would never lift a finger since it all still works. Knock on wood it is still running ok but as loud and annoying as ever.

 

Sounds a lot like a old Ford Tauris power steering pump whine from the 80's! Anyone old enough I'm sure has heard that sound before since all Tauris models had that issue!

  • 2 weeks later...
Greyhound6.2 Enthusiast

Greyhound6.2

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Posted

A bit of a delay I finally got it up to the dealer to look at they have not 100% diagnosed the issue but are leaning towards either the torque converter or the entire transmission being replaced. on Day 4 now of having no vehicle to drive as the dealer is out of loaner cars....

Greyhound6.2 Enthusiast

Greyhound6.2

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Posted (edited)

Well apparently after the dealer having the truck 6 days "finally" dropped the pan on the transmission and told me they found "allot" of metal shavings in the pan so they are replacing the torque converter and pump.....Call me crazy but I was under the impression that when metal shavings were present it was time to rebuild or replace the tranny as all the bearings and seals or any tight fitting parts have been contaminated with "liquid sand paper"

 

oh and....still no loaner/rental car....and my truck is my only vehicle....so why exactly did I buy a new truck that was supposed to be mechanically trouble free for years???

Edited by Greyhound6.2
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jaxcam02 Enthusiast

jaxcam02

Posted
Posted

I would not be happy about them not replacing the transmission if they found a lot of metal shavings, especially in an automatic. If they aren't going to replace the transmission then I would ask for some kind of additional time/mileage added to the warranty for transmission issues.

  • 9 months later...
Mark Ulm Enthusiast

Mark Ulm

Posted
Posted
On 9/12/2022 at 7:30 PM, Greyhound6.2 said:

Well apparently after the dealer having the truck 6 days "finally" dropped the pan on the transmission and told me they found "allot" of metal shavings in the pan so they are replacing the torque converter and pump.....Call me crazy but I was under the impression that when metal shavings were present it was time to rebuild or replace the tranny as all the bearings and seals or any tight fitting parts have been contaminated with "liquid sand paper"

 

oh and....still no loaner/rental car....and my truck is my only vehicle....so why exactly did I buy a new truck that was supposed to be mechanically trouble free for years???

Hi Greyhound... My 2020 Silverado 6.2L trail boss is making this exact whining noise as well. Can you please update me on how this ended up with the dealer / service? I dropped mine off this morning and they didn't even hear it on their own, so I had to go back and show them, then they heard it and said they will put it up on the rack and try to see where it is coming from. I want to get ahead of them coming back and saying something like "its normal" or "no issues".

JakeS1 New Member

JakeS1

Posted
Posted (edited)

My 2021 5.3 with 26K miles started this today.  Changes with RPM and sounds exactly as op states.  I'll be dropping it off at the dealer in the next few days.  Wondering how op's issue was resolved as well.  

Edited by JakeS1
year and mileage added
Greyhound6.2 Enthusiast

Greyhound6.2

Posted
  • Author
Posted (edited)

A bit of a long story, they had it in and out of the shop for nearly 2 months shotgunning parts, torque converter, pump, partial rebuild of the "front of the transmission" then replaced transfer case, then replaced the whole transmission, 

 

Essentially there is a problem with the idler gear going bad in the 10 speeds and then it starts digging in to the case and destroying bearings and then the pump spits metal everywhere and bad things happen....    decent explanation linked.  https://www.tiktok.com/@romanobrythonicmindset/video/7208405234958257451

Edited by Greyhound6.2

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