Cold Start Whining Horn Like Noise Comes and Goes? -with video/sound clip

[JonR2013]

Has anyone resolved this issue yet? I picked up my new 2023 2500HD Sierra Duramax a few weeks ago and it has been doing this since day 1.

[Kmano]

Hi All,

I had the fan clutch replaced last Friday and have put ~200km both city and highway driving and since then.  So far the sound has not returned.  They also put a new auxiliary belt on. 

 

So hopefully the problem is now resolved.

 

 

[Ian tucker]

Did anybody have a solution to this one. I have the same problem on my 2500

[Ian tucker]

Just took mine into the dealership. They said GM had a bad batch of fan clutches. They also mentioned GM can’t narrow it down to find where the faulty fan clutches came from, meaning even if they replace the fan clutch, there is a chance that another faulty one will be installed. Hoping I get lucky.

[Group_er]

Just an update here, dealer replaced the alternator, which didn't fix the problem. Now they think it's something internal to the engine, They ordered some internal engine clutch related parts? which have come in, Ive just been too busy to get the truck back in to the dealer. I will post an update once I do..

[Pryme]

5 hours ago, Group_er said:

Just an update here, dealer replaced the alternator, which didn't fix the problem. Now they think it's something internal to the engine, They ordered some internal engine clutch related parts? which have come in, Ive just been too busy to get the truck back in to the dealer. I will post an update once I do..

I thought someone said fan clutch was the issue? That was my guess from the start. 
I often wonder if they love throwing parts at trucks to boost income. 
 

I know GM has to approve them but I wonder about them doing what they can. It just seems the dealers just throw parts at new trucks hoping for the best. 

[jacob2277]

I have a new 2023 Duramax and have had the same problem.  The Truck has been in shop twice, replaced the fan clutch both times.  The first "fix" did nothing.  The second "fix" has resolved the noise at idle, but i still get the noise when engaging the accelerator at low speeds in the morning after startup.  Super annoying.  I just pinged the dealer again and GM's only recommended repair is replacing the fan clutch.  Just how many fan clutches do i have to get replaced in order to have a properly functioning $80K truck?   

[GMCustomerService]

On 5/16/2023 at 4:19 PM, jacob2277 said:

I have a new 2023 Duramax and have had the same problem.  The Truck has been in shop twice, replaced the fan clutch both times.  The first "fix" did nothing.  The second "fix" has resolved the noise at idle, but i still get the noise when engaging the accelerator at low speeds in the morning after startup.  Super annoying.  I just pinged the dealer again and GM's only recommended repair is replacing the fan clutch.  Just how many fan clutches do i have to get replaced in order to have a properly functioning $80K truck?   

This is certainly not what we like to hear, jacob2277.  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 truck. To do so, please send an email to [email protected] with ATTN: jacob2277/GM Trucks in the subject line.

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[Group_er]

Ok guys, finally finally had the time and availability to take the truck into the dealer. 
they replaced the fan clutch, and the noise has been gone since. (2-3 weeks)

here’s a copy of the service order from my dealer. Hopefully it can help some others out:

 

[Sonny R]

Sounds identical to mine. And yes. It can be heard at 55mph in the cab. Goes away once u reach normal engine temp.

[GMCustomerService]

On 7/5/2024 at 9:47 AM, Sonny R said:

Sounds identical to mine. And yes. It can be heard at 55mph in the cab. Goes away once u reach normal engine temp.

Our team regrets to hear of this noise concern you are experiencing with your vehicle and would like to take the time to investigate further for you. Please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional information. We look forward to your email.  

[Nay]

Mine has the same thing 2024 2500 and 6000km on it  . Took it to the gmc service and said that is normal for cold start . This is not normal for the brand new truck an I am so disappointed 

[Sonny R]

I took mine in also. Tech said he never heard anything like it. Good news is lately it has gone away. I am in single digit temps and I do not hear it now. Has been over a month, no moo sounds. 54,000 miles on truck. I would have it documented and not worry about it, IMO.

[Bighig]

I'm having the exact same sound now.

A few months ago I noticed a horrible grinding sound upon cold start up, which ended up being a bad fan clutch and idler. Had them replaced at the dealer ($$$) and then noticed this sound.

Looks like I got one out of the bad batch.

[Sonny R]

Yeah, my noise has come back. Strangely it was after i had the fuel filter replaced at the dealer. It comes and goes now. I just curse it and roll on lol.