Hello and annoying rattle on new '20 Suburban

[Mike Lindell]

Hi all,

Been in the GM full size SUV family about 5 years, first with my Tahoe when I began lurking this forum and now a new 2020 Suburban with 2400 miles on it.

Hoping someone can help me figure out this sound that's been baffling me...happens around 4-5 seconds in the video, sounds more pronounced in reality. The video is a sample of the sound, but it will happen more continuously if moderate/heavy acceleration and especially uphill. Truck has 2400 miles on it so not sure what this could be.

Thanks in advance and looking forward to being on the forum.

 

[Doubeleive]

Hi all,

Been in the GM full size SUV family about 5 years, first with my Tahoe when I began lurking this forum and now a new 2020 Suburban with 2400 miles on it.

Hoping someone can help me figure out this sound that's been baffling me...happens around 4-5 seconds in the video, sounds more pronounced in reality. The video is a sample of the sound, but it will happen more continuously if moderate/heavy acceleration and especially uphill. Truck has 2400 miles on it so not sure what this could be.

Thanks in advance and looking forward to being on the forum.

you will need a passenger to help find the source, could be literally anything, if they cannot pinpoint it by ear then put a phone on record and move it around the inside the vehicle then playback the recording to find where the noise is louder.

 

[Tiredmechanic23]

Hi all,

Been in the GM full size SUV family about 5 years, first with my Tahoe when I began lurking this forum and now a new 2020 Suburban with 2400 miles on it.

Hoping someone can help me figure out this sound that's been baffling me...happens around 4-5 seconds in the video, sounds more pronounced in reality. The video is a sample of the sound, but it will happen more continuously if moderate/heavy acceleration and especially uphill. Truck has 2400 miles on it so not sure what this could be.

Thanks in advance and looking forward to being on the forum.

including what was said above you could also get up under it and grab the exhaust at different points and shake it to check for anything loose. I had near my entire exhaust on my 2016 work loose in the first few thousand miles.

Also check the spare tire it could be possibly loose slightly.

 

[OR VietVet]

Welcome to the forum from Oregon and please post pics, inside and out.


We recommend that you put all your rig(s) info in your signature so we all don’t have to guess at year, make, model, engine size, trans, rear axle locker…….etc. While you may have posted pertinent info in your first post, you may forget to do it again and the info is needed by us anyway. Makes it way easier on all members that attempt to help, to have that info right up front. It is also recommended that you take a pic of your RPO codes, on the inside cover of the glove box, and post that image in your signature. All this info will greatly help those that will try to help with a problem.


If there is any other info, like upgrades, mods or recent mechanical/maintenance work done, that would be helpful in any post as well. Too many times a question is asked by the poster and after about 10 responses we find out that the poster has done recent work to attempt to fix the problem or work that was done that SEEMS not related to the problem.

 

[BentleyArnage]

you will need a passenger to help find the source, could be literally anything, if they cannot pinpoint it by ear then put a phone on record and move it around the inside the vehicle then playback the recording to find where the noise is louder.

Could be a beer bottle rattling around in the doors. We had that when I was a kid on a 68 Cadillac Drop Head Coupe. No one could find the problem. The dealer was sick of us. My uncle found it going up his gravel drive. Then the motor went south, a typical 68 issue from a faulty oil pump drive shaft. Good times!

 

[Miami-Dade]

Could be a beer bottle rattling around in the doors. We had that when I was a kid on a 68 Cadillac Drop Head Coupe. No one could find the problem. The dealer was sick of us. My uncle found it going up his gravel drive. Then the motor went south, a typical 68 issue from a faulty oil pump drive shaft. Good times!

My mom [RIP] had a 68 Sedan DeVille when I was growing up. Had the same exact same issue. The dealer at the time [Feldner Cadillac in Hackensack New Jersey] found the bottle. She bought the Caddy as she wanted factory a/c as she travelled a lot in the summer. No issues with the Caddy whatsoever but did hear about the oil pump issue. Dealer service at Felder was awesome!

 

[Mike Lindell]

My mom [RIP] had a 68 Sedan DeVille when I was growing up. Had the same exact same issue. The dealer at the time [Feldner Cadillac in Hackensack New Jersey] found the bottle. She bought the Caddy as she wanted factory a/c as she travelled a lot in the summer. No issues with the Caddy whatsoever but did hear about the oil pump issue. Dealer service at Felder was awesome!

Funny you mention Hackensack, I was driving through there when I recorded the video above. Entering 17 off Essex street coming from the hospital.

 

[Miami-Dade]

Funny you mention Hackensack, I was driving through there when I recorded the video above. Entering 17 off Essex street coming from the hospital.

Grew up in Teaneck across the street from Fairleigh Dickinson University. Loved it there.

BTW when I visit the NYC-NJ area I use Paramus Chevrolet on Route 17 North for service. John MCGarry is good to deal with for service.

 

[Mike Lindell]

Grew up in Teaneck across the street from Fairleigh Dickinson University. Loved it there.

BTW when I visit the NYC-NJ area I use Paramus Chevrolet on Route 17 North for service. John MCGarry is good to deal with for service.

I'll be going there Monday to get this sound looked at!

 

[Mike Lindell]

thanks all for the responses, I THINK its engine ping or something related

 

[wjburken]

I'll be going there Monday to get this sound looked at!

Hope you can get this resolved so you can finally get a good nights sleep.

 

[Richard Blakely]

I had an ‘05 suburban with an annoying rattle like this. Almost made me have to trade in! But, I took off passenger door interior facing, and found a loose bolt on the electric motor mechanism. Tightened it up and voila! Rattle disappeared

 

[Rdr854]

Grew up in Teaneck across the street from Fairleigh Dickinson University. Loved it there.

BTW when I visit the NYC-NJ area I use Paramus Chevrolet on Route 17 North for service. John MCGarry is good to deal with for service.

Emerson, NJ until we moved to Fairfax, VA as a kid.

 

[iamdub]

Hi all,

Been in the GM full size SUV family about 5 years, first with my Tahoe when I began lurking this forum and now a new 2020 Suburban with 2400 miles on it.

Hoping someone can help me figure out this sound that's been baffling me...happens around 4-5 seconds in the video, sounds more pronounced in reality. The video is a sample of the sound, but it will happen more continuously if moderate/heavy acceleration and especially uphill. Truck has 2400 miles on it so not sure what this could be.

Thanks in advance and looking forward to being on the forum.

The sound and when it happens are very much like symptoms of detonation (preignition, spark knock, etc.)

Stop using Shell gas. lol

Seriously, though, what brand what grade are you running? As a simple test, fill up with 93 and see if there's any change.

 

[OR VietVet]

The sound and when it happens are very much like symptoms of detonation (preignition, spark knock, etc.)

Stop using Shell gas. lol

Seriously, though, what brand what grade are you running? As a simple test, fill up with 93 and see if there's any change.

@iamdub, I wish I had younger ears. I could not hear that engine ping unless maybe it was louder. Good call if that is what it is.

 

[iamdub]

@iamdub, I wish I had younger ears. I could not hear that engine ping unless maybe it was louder. Good call if that is what it is.

I had to play it a few times with my crappy laptop speakers maxed out. Once I heard it, I honed in cuz I used to hear the same sound during the same instances with my Tahoe during hot weather if I ran 87. It sounds like more of a clicking, like the ol' zip ties around the driveshaft prank.

 

[OR VietVet]

I have had that exact zip tie around driveshaft prank played on me at a shop I ran. Thankfully I was the service manager and had keys to get back in the shop when I heard that noise. I immediately turned around and racked my truck to inspect. Lots of laughs in the shop the next morning.

 

[SilverGABullet]

thanks all for the responses, I THINK its engine ping or something related

Mike, I have had/have the same issue in my 18 Tahoe. Best way i could describe it was if you had a slightly loose washer on a bolt and it sounded as if it raddled in the engine bay while the car is under acceleration/load.

What did the dealer end up telling you?

 

[Mike Lindell]

The sound and when it happens are very much like symptoms of detonation (preignition, spark knock, etc.)

Stop using Shell gas. lol

Seriously, though, what brand what grade are you running? As a simple test, fill up with 93 and see if there's any change.

I think you're right, this is someone else's video of their truck but it's the exact same sound...

And this actually did happen with a mix of shell and citgo 87 octane. I'm half way through a tank of Exxon 93 and no trace of the sound. I think you nailed it, thanks

 

[Mike Lindell]

Mike, I have had/have the same issue in my 18 Tahoe. Best way i could describe it was if you had a slightly loose washer on a bolt and it sounded as if it raddled in the engine bay while the car is under acceleration/load.

What did the dealer end up telling you?

Thanks, I never went to dealer that day. Filled up 93 Octane so far no sound!