haider320

I don't have DFM but still have start/stop.

My 2018 5.3 made that same exact sound as my 2021 5.3.

Build date 10/21 and no DFM. I only have 1100 miles on the truck though. So far so good. Fingers crossed...

Just checked. I have 60 & 67 and DFM is not installed on my 21.

2021 X31. I have 485 miles on the OD. Does anybody else's front suspension pop or creak while putting it into reverse and turning the front wheel?

Yup as mentioned above. No more heated/cooled seats either for 2022. My new SLT (build date 10/21) has no backup sensors, side mirror indicators or DFM; but I still have start/stop. GM's gotta do what it has to do in order to sell their vehicles.

My 2021 is one of the 2021's that does not have DFM. It's in V8 mode all the time. I wonder if I'll be good?

I saw this too. How can the Chevy 5.3 have this notice but not the Sierra?

https://www.google.com/amp/s/gmauthority.com/blog/2021/12/gm-releases-valve-lifter-service-update-for-v8-engines/amp/

So, I've had my 21 SLT X31 for 3 weeks. Just looked at my build sheet and I do not have DFM. I also do not have the HD radio. Both show a 50.00 credit. So I'm assuming, with no DFM, I will not to have to worry about the lifters collapsing? Build date 10/21. I do have stop/start.

[mention=126037]Haider320[/mention] I was just going to send you a message to make sure you saw the video in the first post. It certainly sounds like what you were describing by a blinker type noise. The post above yours says they replaced the high pressure fuel pump and it fixed the issue for another member who was experiencing the same noise. Yes, thanks. I just read that. On the YouTube link, there are several guys saying they have the same sound. Either GM has some faulty fuel pumps, or some of them just sound like that. My best friend has an 18 and he says his makes the same sound like mine. Kinda like the vibration issue. Some have it, some don't.

I know this is an old thread, but has anybody determined what this sound is? My 18 makes the same sound.

My new 2018 Z71.

First 6.2 I've heard doing this. Probably a fluke thing. Sorry it had to happen to you but at least you're getting a new crate motor.

Check out the thread with the Add 1 catch can. 85.00 and it's doing the same thing as these expensive cans. The Add 1 looks better to. lol My Add 1 has caught 3 table spoons worth of oil in 200 miles. http://www.gm-trucks.com/forums/topic/169096-installed-add-w1-oil-catch-can/