Humming noise when cold started??

[2023 problem]

I purchased a new 2023 gmc sierra 2500 duramax and have only 3,500 miles on it. It started having a loud annoying humming sound on cold starts. Has anyone figured out whats causing it? Appreciate any help

[Pryme]

1 minute ago, 2023 problem said:

I purchased a new 2023 gmc sierra 2500 duramax and have only 3,500 miles on it. It started having a loud annoying humming sound on cold starts. Has anyone figured out whats causing it? Appreciate any help

Someone else posted about this with his new GMC too with a video. I don’t remember which thread but it wasn’t that long ago 

[2023 problem]

Yeah i commented on it hoping he could tell me something but haven't heard anything 

[GMCustomerService]

23 hours ago, 2023 problem said:

I purchased a new 2023 gmc sierra 2500 duramax and have only 3,500 miles on it. It started having a loud annoying humming sound on cold starts. Has anyone figured out whats causing it? Appreciate any help

This is certainly not what we like to hear, 2023 problem.  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 2023 GMC Sierra 2500. To do so, please send an email to [email protected] with ATTN: 2023 problem/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. The information you provide may be monitored and recorded and is subject to the GM Privacy Statement.
 
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
 

[MTU Alum]

If it's only at cold ambients and after sitting for a while, I would look at fan clutch.  

 

#iworkforGM

[Kmano]

Had the same issue, mechanic replaced the fan clutch and auxiliary belt. 

 

The video's are posted here if you want to compare noises.  

 

https://www.gm-trucks.com/forums/topic/261255-cold-start-whining-horn-like-noise-comes-and-goes-with-videosound-clip/#comment-2607383

 

Note there are multiple pages on the forum with the resolutions on page 2, getting a lot of follow up messages asking if the issue was resolved, but it's all posted here

 

Edited April 5, 2023 by Kmano

[redwngr]

On 3/31/2023 at 6:18 PM, MTU Alum said:

If it's only at cold ambients and after sitting for a while, I would look at fan clutch.  

 

#iworkforGM

Do they Intentionally) drag the fan to provide load during cold weather / elevated idle starts?

Edited April 13, 2023 by redwngr

[Sonny R]

Same w my 2022 HD. Seems to hum/moo when u press the accelerator pedal.

 

Edited July 5 by Sonny R