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.

Well, of course the truck was warm by the time I got to the dealer so they couldn't hear it. I had a recording of the tick and the tech said it sounded like the high pressure fuel pump but said they all do it. It's bs but what can I do? Screw it, it's under warranty. If something breaks, I'll get it fixed.

Yup, mine goes away too when warm. I'm at the dealer now. Lets wait and see what they say.

So you're having the same noise as me, or is yours different?

So this morning I started it. The sound started about 10 seconds into idle. It sounds like it increases with rpms but the engine drowns out the noise at 1200 rpms. I'm thinking it's got to be something related to the exhaust.

I tried to listen to it while pressing on the accelerator. The engine ended up drowning out the sound, so i couldn't tell if it increased with rpms. What i dont understand, is the sound goes away once the truck is up to normal temperature. The sound seems to be coming from the drivers side, down by the exhaust.

I did. It's the YouTube link 7-8 posts above.

No, mine sounds exactly like a turn signal blinker. It goes away when the truck is warmed up.

As in going bad?

Anybody else?

I'm wondering if it's the heat shields around the exhaust expanding? It's a consistent sound, like a blinker.

After listening more, I don't think it's the injectors. Listen to this clip and you can hear the blinker sound. Goes away once the truck is warm. Here is a link from YouTube. It sounds like a blinker. Watch "2018 Chevy knock" on YouTube https://youtu.be/dqqfRdke9Yk

Thank you sir

230 miles on my new 18. Just started hearing the noise yesterday. On a cold start, it literally sounds like my blinkers are on. The sound is coming from the bottom of the engine on the drivers side. Once the engine is warmed up, the sound goes away. I cant hear the sound from inside the cab. Only reason I heard it yesterday, is because as soon as I started the truck, I got out to run back into the house. Exhaust leak?