IndyAndy

Truck is at the dealer. They are saying exhaust manifold gasket. Not sure if it is just a gasket failure or a broken bolt. Covered under the powertrain warranty.

https://www.valleychevy.com/chevrolet-powertrain-warranty/ "Seals, gaskets and manifolds" According to this, I think this is covered. Hopefully, I don't have to haggle with my local dealer too much. My past experiences they don't really like warranty work.

I am still within 5 years/100,000 miles. Would this be covered under the power train warranty?

My mechanic buddy said the same thing.

2014, 5.3L V8, 67,xxx miles Recently, my truck has developed a squealing sound when accelerating when it is cold. It goes away after a few miles, but you will hear it a little still even after warmup. It will also have an obnoxious squealing at startup from cold, usually for about 15-20 seconds. I took a video of the startup and sent it to my buddy who used to be a mechanic and he said it sounds like an exhaust manifold. After taking a closer look, there is black on the exhaust manifold on the passenger side furthest side to the firewall. Also, at startup, I am getting exhaust fumes inside the truck. I'm assuming this is covered under the powertrain warranty? Also, has anyone else experienced this/heard of this happening?

There could be an aero part to the vibration. Yesterday, while on the highway going around 75mph, I noticed a pretty good vibration with the center console. When I got to my destination, I noticed I had left my tailgate down.