KGray

I’ve got the same issue in my 2020 Silverado 2500 HD Custom with a 6.6 gasser... I’ve only got 500 miles on it. It’s January so the temp outside is around freezing here in Washington. Once the truck is warm the noise goes away on start up. I’ll be listening to see if it goes away when the weather warms up. I will most likely be taking it in for the Chevy dealer diagnose it. Super frustrating.