Brian21477

I don’t blame you. I love the truck, just want it fixed. But I too am getting alittle tired of letting it sit in the shop more than my driveway!

I took mine in today for the third visit for the engine whine. Some older mechanic who said he’s been in the business for a long time rode with me to hear the whining. He tried to tell me he couldn’t hear the noise. I said really! You don’t hear what sounds like a fire engine siren in the distance coming from the front of the truck? Then he proceeded to tell me that he was deaf in his left ear. I laughed and said that would be my luck! Then he eventually heard it and drove it himself to see if he could feel the degradation of power as well. He said he didn’t know how it felt when it was new so he wanted to test drive another one from the sales lot. Not sure where that ended up because I had to get to work so I left it. They gave me a loaner. This visit here will take me into the time window for the lemon law. I already spoke with an attorney and started the process.

It’s not just in your head. My 6.2 Trail Boss has the 18” wheels with the GY Duratracs but mine used to feel so much more powerful. Only have 2500 miles on it!

This gives me no confidence at all in getting mine resolved. I have my third appointment tomorrow at Chevy (different dealership this time to see if I get better results). Funny you mentioned yours is now driving like a cold diesel, because mine is driving like that too now, only 2800 miles on it. I swear it has lost power. The 420 HP motor drives like a 4 cylinder now. I am so over this as well. I have contacted a lemon law attorney to start the process.

RWTJR, I’ve heard that about the Y connector, I tried to trace mine up to the other end but can’t see it. But looking at the diagram of the link you posted, that is the exact tube I am talking about. And it clearly shows being connected to the transfer case from the transmission. Thanks for all the info.

That’s what I figured but can’t see exactly where it goes into on the other end. So yours is plugged into the TC as well?

Thank you. Makes me wonder if it popped off or wasn’t connected from the factory

Can’t see the other end but it looks like it goes forward and up towards transmission

Wow, thank you. That does answer. Weird that mine is disconnected. Searching for the part number it shows that hose is the transmission case emission evap vent tube. Thought it would be normal to be hanging as it is a vent hose. But it made me suspicious when I saw the nipple on the transfer case with nothing attached!

Thank you. By the way this is the view from drivers side of transfer case. Hose is coming from the front, possibly to the transmission?

Was wondering if anyone knows if this hose (p/n GM6150M) is supposed to be attached to the circled nipple on the transfer case in the picture or is it supposed to hang down? 2020 LT Trail Boss 6.2L.

I had a knock too, more of a clunk when going over bumps, more like speed bumps or driveway entrances, when the truck would rock as a result and would get a clunking sound. Sounded like there was something bouncing around in the bed almost. I brought to dealer and they installed some pads between the leaf springs. It definitely helped silence it but still hear the clunk slightly from time to time. Not sure if this is the same knocking you’re getting. As for the whine, I’m frustrated with this. I’m reading on here a lot of guys with the same problem and no fix. I don’t have a lot of time to be leaving my truck with the dealer as I am active duty Marine and deploy. So not sure what to do next. As for the lemon law, I’m stationed in NC and their lemon law is 20 days in the shop with unsuccessful results or 4 times for same repair qualifies for lemon law. I’ve already had it in the Chevy dealer twice (total of 18 work days), so one more unsuccessful visit to the dealer will be it. I will probably start looking into the lemon law lawyers.

Hey Dersch, any update on the engine whine? Did the tranny pump fix it? I have 2020 LT Trail Boss 6.2 with same engine whine. Two dealer visits with 0 luck. They replaced a bearing in or near the transmission pump supposedly but drove off the lot and the noise was still there. Unbelievable.

Any luck finding a fix with the engine whine?

Noticed mine right after I bought too. Around 500 miles maybe. Two dealer visits with parts replaced and 2000 miles later the noise still remains. Irritating. Gloat all confidence in my local dealer.