question: There's a faint chattering noise when accelerating on th

Dnt · March 18, 2017

Hey fellas I wanted to report back in. When I took the truck back in for an oil change a few weeks back

they reseated the exhaust connection at the third cat converter (GM Borla catback "dealer installed") I cannot get the truck to make the noise now!!!!!!!!!!!! no matter how hard I try. Might just be a coincidence but it has been several weeks and it has simply gone away at the same time as the exhaust connection rework.

That connection appears to just be flared and looks like a metal to metal connection? Here is a pic of the cat end of the factory exhaust off my truck, the GM Borla catback has the same flared end. It looks like just a clamp in that area and would be easy to get some misalignment/sealing issues .............

Slightly over 15,000 miles now. Here is a pic of trip B I set that not long after i got the truck back in June 2016. Loving the truck so far but really eyeballing a HD with the monster 6.6 duramax.....

Edited March 18, 2017 by MyFavTruck

MapleBud · October 28, 2017

Hi Guys, I’ve got a 2017 Sierra Elevation with the 5.3 ecotec... I’ve brought my vehicle in 3 times because of this noise and finally was told it is the high pressure fuel pump that is making that noise while accelerating or engine under load. They told me it’s normal, and if I were to change it it may be worse. Let me know what you guys think. And if any of you guys were told it was this fuel pump as the cause.

polarisnchevy · October 28, 2017

I have the same noise that is described. Thinking of upgrading cai and gm borla exhaust to cover it. It gets annoying in stop and go traffic.

Sasha Vrajich · November 29, 2017

'17 Sierra 1500 Denali with 6.2 and it makes the same card in the spokes chatter since day 1 (9k miles now). Dealer said it's the fuel pump and ordered one because they were on backorder. I pick up the truck tomorrow (fingers crossed the noise is gone). FYI the loaner 1500 Texas edition I got had the same noise.... Not feeling so good about going from a tundra to this GMC..

MapleBud · November 30, 2017

On 2017-11-28 at 9:24 PM, Sasha Vrajich said:

'17 Sierra 1500 Denali with 6.2 and it makes the same card in the spokes chatter since day 1 (9k miles now). Dealer said it's the fuel pump and ordered one because they were on backorder. I pick up the truck tomorrow (fingers crossed the noise is gone). FYI the loaner 1500 Texas edition I got had the same noise.... Not feeling so good about going from a tundra to this GMC..

Any updates? Please tell us the noise is gone.... my dealer said it was fuel pump also.

looksstock · December 1, 2017

On ‎11‎/‎30‎/‎2017 at 3:46 AM, MapleBud said:

Any updates? Please tell us the noise is gone.... my dealer said it was fuel pump also.

The issue was not resolved with replacing the fuel feed line. PIP#5395C. I'm going to try a different dealer...not happy that they said "it was fixed" and 2 miles down the road it starts chattering / ticking the same as before. Definitely only does it under constant gas - super annoying and bothers me on a $60k new truck.

MonkeyMouth · December 1, 2017

On 7/23/2016 at 5:36 AM, whaler said:

I have the same thing on my 2014. I am not buying that it is a water pump or bad fuel. I run 93 every tank. The noise comes from underneath the drivers floor and is not constant. I appears to me like transfer case or torque converter? I have tried to run the truck in manually and it seems to change for the better. Took it to the dealer and got the same crap as most. Thinking new truck.....

Cheers

The Whaler

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2015 CC here. Having the same noise. Like right under the d riverside floor mat for me. Best way I can describe it is like others say, a card in the spokes, but more metallic like. And of course I think it's the transfer case.

On 12/9/2016 at 6:40 PM, groutguy said:

The sound is a loose catalyst inside the catalytic converter.

I installed some LT headers on one of our work trucks last year. This truck (2013) was making the same noise; and when I removed the factory cats and looked inside, the catalyst would move inside.

The catalyst wasn't damaged, it was just the design. GM is using a ceramic base catalyst which is sandwiched inside the converter casing. This design causes the catalyst to move back and forth slightly as the exhaust pulse changes.

The 2014 and up converters look identical to this 2013 1500.

But I hope it's exhaust related (it's cheaper) lol.

MOhunter92 · December 1, 2017

But I hope it's exhaust related (it's cheaper) lol.

How could it be the transfer case, it has nothing to do with the sound. It correlates with throttle 100% and does it in or out of 4wd.

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TA_Fab · December 2, 2017

2017 owner with 5k on the clock got it with 3k. Just noticed the noise recently. Can barley hear it but now I look for it. And have to have everything quit in the cab to hear it. The previous post about the exhaust being re-seated makes sense. But I'm coming from a lifted and straight piped 03 z71 so anythings quiet to me.

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MonkeyMouth · December 5, 2017

On 12/1/2017 at 12:46 PM, MOhunter92 said:

How could it be the transfer case, it has nothing to do with the sound. It correlates with throttle 100% and does it in or out of 4wd.

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The OP is titled:

question: There's a faint chattering noise when accelerating on th

My noise is under the driver side floorboard, when coasting and apply throttle. I'm describing my sound, and the location and what's around there,. And I hope it's exhaust related and not anything more costly.

MOhunter92 · December 5, 2017

The OP is titled:
question: There's a faint chattering noise when accelerating on th

My noise is under the driver side floorboard, when coasting and apply throttle. I'm describing my sound, and the location and what's around there,. And I hope it's exhaust related and not anything more costly.

I understand, that’s where the noise comes from on these trucks for those who have complained about it, I was just letting you know it’s not the transfer case because that sound has nothing to do with it. It’s most likely an issue with the driver side manifold or cat, until GM decides they need to address it we are probably screwed.

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Subtle10 · September 23, 2018

Hey guys, new here to the forum. Hope everyone is doing well.

I just dropped by to add my piece to this discussion, although being an old one. It still seems to be an ongoing issue, including myself.

I love my 2017 GMC Sierra SLT. Love everything about it, minus the chatter under acceleration, as discussed here in this topic.

I've read around that it could be an issue having to do with Direct Injection. I have very little knowledge on the inner workings of any vehicle, mind you.

I would love to hear if anyone is still having these issues, and mainly if anyone has yet found a solution to the problem.

Any possible remedies to drop the noise a good bit? I have an aftermarket exhaust added to drown out the sound.. it sounds great on my 5.3L for sure, but alas.. it is still very present.

Man I really do love my truck, but this sound really puts a damper on my emotions, especially considering the money spent.

Thanks in advance!

300 Blackout · September 24, 2018

Hey guys, new here to the forum. Hope everyone is doing well.

I just dropped by to add my piece to this discussion, although being an old one. It still seems to be an ongoing issue, including myself.
I love my 2017 GMC Sierra SLT. Love everything about it, minus the chatter under acceleration, as discussed here in this topic.
I've read around that it could be an issue having to do with Direct Injection. I have very little knowledge on the inner workings of any vehicle, mind you.
I would love to hear if anyone is still having these issues, and mainly if anyone has yet found a solution to the problem.
Any possible remedies to drop the noise a good bit? I have an aftermarket exhaust added to drown out the sound.. it sounds great on my 5.3L for sure, but alas.. it is still very present.

Man I really do love my truck, but this sound really puts a damper on my emotions, especially considering the money spent.

Thanks in advance!

Remove a quart of oil and add a quart of Lucas synthetic oil stabilizer. I just changed my oil, removing the oil that previously had the stabilizer in it. My truck was definitely quieter with the quart of Lucas added.

Subtle10 · September 24, 2018

6 minutes ago, 300 Blackout said:

Remove a quart of oil and add a quart of Lucas synthetic oil stabilizer. I just changed my oil, removing the oil that previously had the stabilizer in it. My truck was definitely quieter with the quart of Lucas added.

Wow, really! I suppose you are having the same issue as I?

May I ask, what this does to help decrease the "chattering noise" on acceleration?

And how much does the noise decrease; is it a significant difference?

Boy, is that noise annoying!

300 Blackout · September 24, 2018

It increases the viscosity of the oil. I’m not quite sure of the exact mechanisms at play that result in a quieter engine, but it is quieter nonetheless. It won’t take the sound away completely, but it will help.