UPDATED WITH RATTLE VIDEO**WHAT is this noise? 2024 Silverado 1500 WT, 5.3

PunchT37 · February 1

Let`s see what they find. I myself, would rather NOT have someone tear my new truck engine and trans apart till closer to the 5 yr/60,000 mile drivetrain warranty.

Good luck.

s10dragracer888 · February 1

10 minutes ago, PunchT37 said:

Let`s see what they find. I myself, would rather NOT have someone tear my new truck engine and trans apart till closer to the 5 yr/60,000 mile drivetrain warranty.

Good luck.

I feel the same. They won’t give me a loaner either. “We don’t have any until maybe Monday” Was the only response I got.

23LTW · February 1

I recognize that noise. My 23 did it, my 24 did it until around 15k miles then stopped, and my wife's 24 Yukon does the exact same thing and hasn't stopped. Sometimes it does it cold, sometimes it does it hot. Never in time with the engine just very intermittent. I've heard it after driving on the interstate for an hour or warming up in the driveway. I've wondered if it's the exhaust manifold or heat shields being affected by heat because it's not a lifter. It's a very hollow sounding almost crack noise, not a knock.

s10dragracer888 · February 1

1 hour ago, 23LTW said:

I recognize that noise. My 23 did it, my 24 did it until around 15k miles then stopped, and my wife's 24 Yukon does the exact same thing and hasn't stopped. Sometimes it does it cold, sometimes it does it hot. Never in time with the engine just very intermittent. I've heard it after driving on the interstate for an hour or warming up in the driveway. I've wondered if it's the exhaust manifold or heat shields being affected by heat because it's not a lifter. It's a very hollow sounding almost crack noise, not a knock.

@23LTW Dealer said they pinpointed the noise, and contacted GM technical about it. If it was just this, unaccompanied by an unsettling “rattle” at low, constant speed, very very light throttle input, I’d have no concern….but the dealer replicated both problems and it didn’t start the ticking until 2 weeks after I bought it. I’ll let you guys know what the dealer says. @newdude said he was pretty sure it was lifter. There is another post on this site, a bit older, where the guy had the same tick and didn’t ever tell us what’s going on. I believe his username was @2002rst. Newdude also posted the same service bulletin, and as a GM tech, he may have seen a few things. I took it in solely to make sure these issues weren’t in correlation with a pending catastrophic failure. Fingers crossed, but I’m just hoping GM comes back with “oh, it’s a simple fix,” and I get my truck back next week. What really worries me is the valve body issues in the 10-speed. Is this rattle a symptom of that, or something more serious? Is it a stupid simple thing? I don’t know, but I sure as hell want to find out.

23LTW · February 1

These motors make a lot of strange noises is my experience. Hopefully your issue isn't a big deal and they don't have to tear it all apart. Your video is 100% the intermittent cracking noise I've heard with all 3 of our vehicles though. Like I said my 23 5.3 made that noise most every day until I traded it at 31K miles and the 24 I replaced it with quietened down to a gentle purr by 15k miles and makes NO unusual noises now, aside from what I describe below. The 24 also had a cold misfire/shake for the first few thousand miles that eventually went away and never came back. The Yukon idles fine just makes that stupid noise that's especially audible in a drive through. It doesn't get anywhere near as many miles as the truck though so that could be why it still does it.

I think I've also heard the other noise you're describing but not totally sure. I've had a rattly, marbles in a can type noise easing back into the throttle from a slow coast (25mph or so) I can sometimes hear with the windows down. Impossible to tell if it's engine or transmission because it sort of sounds like a pump experiencing cavitation too. Who knows. All 3 do/did it.

Dan H 2023 HC · February 1

I doubt the noise is VB related. At idle the VB isn't doing anything, none of the solenoids are active/cycling.

I recently watched a video that, in part, talked about the wildly complex torque converter GM uses with the 10 speed coupled to the engines with AFM/DFM. Here it is and, to me, it's particularly interesting starting at about the 8 minute mark when he describes the "pendulums". GM 10L80 and Ford 10R80 Torque Converter Operation and Diagnosis

PunchT37 · February 1

21 minutes ago, Dan H 2023 HC said:

I doubt the noise is VB related. At idle the VB isn't doing anything, none of the solenoids are active/cycling.

I recently watched a video that, in part, talked about the wildly complex torque converter GM uses with the 10 speed coupled to the engines with AFM/DFM. Here it is and, to me, it's particularly interesting starting at about the 8 minute mark when he describes the "pendulums". GM 10L80 and Ford 10R80 Torque Converter Operation and Diagnosis

Saw that vid too. That`s prolly that short rap that I and a few others have on startup. Not the engine oil pump. Another possibility for that rap could be those sloppy trans oil pump drive gears. That slop with a ulv oil? Hmmm.

Edited February 1 by PunchT37

s10dragracer888 · February 2

8 hours ago, PunchT37 said:

Saw that vid too. That`s prolly that short rap that I and a few others have on startup. Not the engine oil pump. Another possibility for that rap could be those sloppy trans oil pump drive gears. That slop with a ulv oil? Hmmm.

8 hours ago, Dan H 2023 HC said:

I doubt the noise is VB related. At idle the VB isn't doing anything, none of the solenoids are active/cycling.

I recently watched a video that, in part, talked about the wildly complex torque converter GM uses with the 10 speed coupled to the engines with AFM/DFM. Here it is and, to me, it's particularly interesting starting at about the 8 minute mark when he describes the "pendulums". GM 10L80 and Ford 10R80 Torque Converter Operation and Diagnosis

18 hours ago, 23LTW said:

These motors make a lot of strange noises is my experience. Hopefully your issue isn't a big deal and they don't have to tear it all apart. Your video is 100% the intermittent cracking noise I've heard with all 3 of our vehicles though. Like I said my 23 5.3 made that noise most every day until I traded it at 31K miles and the 24 I replaced it with quietened down to a gentle purr by 15k miles and makes NO unusual noises now, aside from what I describe below. The 24 also had a cold misfire/shake for the first few thousand miles that eventually went away and never came back. The Yukon idles fine just makes that stupid noise that's especially audible in a drive through. It doesn't get anywhere near as many miles as the truck though so that could be why it still does it.

I think I've also heard the other noise you're describing but not totally sure. I've had a rattly, marbles in a can type noise easing back into the throttle from a slow coast (25mph or so) I can sometimes hear with the windows down. Impossible to tell if it's engine or transmission because it sort of sounds like a pump experiencing cavitation too. Who knows. All 3 do/did it.

Thank y’all for your responses. Mine does make like a “crackling groan” from startup that only lasts a second that my 4.3/6L80 made from the day I got it. I attribute it to transmission pump because, during startup, it sounds like it comes from just behind bellhousing area. I actually crawled under my last truck and listened.

As far as the tick goes, it’s so erratic and off time with the engine, it could be anything. It’s weird….but I heard the rattle just like yall did and I was concerned something would come apart. The tick didn’t exist until the day I took it to the shop, either.

PunchT37 · February 2

42 minutes ago, s10dragracer888 said:

As far as the tick goes, it’s so erratic and off time with the engine, it could be anything.

That`s the key I spoke about earlier. A bad lifter would always be in time. Intermittent or not. AND, I don`t think a bad lifter would be happy at 5600 rpm`s like I did to mine.

Thing is, once you drive it a while, listen to it idle. Quiet as a mouse. If I restart it warm, quiet also. Cold start in cold temps? Yep. Makes all these raps and clicks.

s10dragracer888 · February 2

1 hour ago, PunchT37 said:

That`s the key I spoke about earlier. A bad lifter would always be in time. Intermittent or not. AND, I don`t think a bad lifter would be happy at 5600 rpm`s like I did to mine.

Thing is, once you drive it a while, listen to it idle. Quiet as a mouse. If I restart it warm, quiet also. Cold start in cold temps? Yep. Makes all these raps and clicks.

What was ultimately concerning was that it started randomly one day, and it accompanied an already present rattle. These unusual noises, if normal, should be disclosed to buyers when they purchase these vehicles. I wouldn’t be so worried if it was considered normal….but these didn’t start up until after it was driven for a few miles.

s10dragracer888 · February 4

On 1/31/2025 at 8:32 PM, PunchT37 said:

Let`s see what they find. I myself, would rather NOT have someone tear my new truck engine and trans apart till closer to the 5 yr/60,000 mile drivetrain warranty.

Good luck.

On 2/1/2025 at 11:12 AM, Dan H 2023 HC said:

I doubt the noise is VB related. At idle the VB isn't doing anything, none of the solenoids are active/cycling.

I recently watched a video that, in part, talked about the wildly complex torque converter GM uses with the 10 speed coupled to the engines with AFM/DFM. Here it is and, to me, it's particularly interesting starting at about the 8 minute mark when he describes the "pendulums". GM 10L80 and Ford 10R80 Torque Converter Operation and Diagnosis

Engine tick was diagnosed as potential wrist pin or retaining clip failure. Severe scoring found on wall of cylinder number two. Engine is being replaced and should be up and running by the middle of next week. Engine is on the way.

The rattle was diagnosed as torque converter engagement at low vehicle speed, lock-up with DFM engaged. About 5th gear. They have another 2024, 5.3/10-speed (4,000 miles) that rattles in the same fashion. They’re thinking a software update to disable DFM at low speeds would be a likely fix (does not do it when all 8 cylinders are engaged). Further info will be provided when engine is replaced; a GM engineer is going to pay the dealer a visit for my truck to see if adjustments to the programming is necessary.

newdude · February 4

12 minutes ago, s10dragracer888 said:

Engine tick was diagnosed as potential wrist pin or retaining clip failure. Severe scoring found on wall of cylinder number two. Engine is being replaced and should be up and running by the middle of next week. Engine is on the way.

The rattle was diagnosed as torque converter engagement at low vehicle speed, lock-up with DFM engaged. About 5th gear. They have another 2024, 5.3/10-speed (4,000 miles) that rattles in the same fashion. They’re thinking a software update to disable DFM at low speeds would be a likely fix (does not do it when all 8 cylinders are engaged). Further info will be provided when engine is replaced; a GM engineer is going to pay the dealer a visit for my truck to see if adjustments to the programming is necessary.

Ouch. The rattle issue sucks too but ouch for the engine. That blows.