MudMonkey

The parts were ordered before the tsb came out and just now arrived.

New air intake was installed and it didn’t fix it. Per the TSB looks like GM is giving us the finger!

I use midgrade gas. I wonder if premium would make the noise go away. I will try this out and see what happens.

Per usual Gm, one of the parts is on back order. I did hear a whistle noise while climbing on a mountain pass today. The rpm’s were around 2500 when I could hear it. Almost sounded like a faint turbo whistle. i thought I seen a post about something similar. I can’t remember if it was on a gasser or diesel. Maybe the two sounds are related.

Took the truck in again to the dealer. They are still at a loss of what it is. Dealership is going to order an intake and see what that does. They basically told me they will bust out the parts cannon and keep throwing parts at it until GM stops paying for warranty work.

I got a new starter put in today and no joy. It still has the same noise. It might be a little bit quieter. Back to the drawing board.

I can hear the noise every time I give a quick blip of the throttle when it is park. Service department said there is TSB for a starter noise. I don’t know the TSB number.

I am still waiting on a starter to come in. Dealership is hoping they can get one by the 12th. they tried finding one from another dealership and apparently no one is letting them go if they have one.

Mechanic said he listened to the starter with a stethoscope to confirm it. Maybe it is the same starter as the half tons and has something to do with auto start stop feature?

Dealership says it is the starter and have one ordered to change it out. Apparently it has been more common on the half tons pickups. I will post an update when the starter gets put in.

Mine will go back in on Monday. The tech did check if the noise was still there with the belt off and it was. Dealership is leaning more towards something with the air flow on the intake is the culprit.

My 2024 LTZ sport gasser with its older brother, 1997 Chevy 3500 CCLB with a 454.

I am having the same issue with my truck. It is a 24 2500 with 7k miles and noticed the belt squeal/chirp at around 1000 miles. The first visit they checked the pulleys and didn’t find anything. the dealer has called in for support to the higher ups. The service manager had mentioned they might look into the intake/throttle body for the noise. I asked them if the noise is there with the belt off. Apparently they didn’t check that out. If it still makes the noise with the belt off, it might be related to the air intake system. It has been to the dealer twice and they have not come up with a solution. i have a third visit scheduled on the first to replace the driver seat motor and they will investigate further on the squeal.