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2015 Tahoe LTZ Random Knocking Noise in the front

Charles1223

By Charles1223
in Troubleshooting & Recalls

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Charles1223 Enthusiast

Charles1223

Posted
Posted

Hey everybody,
About 2 years ago I purchase a certified pre-owned 2015 Tahoe with 56K miles. I have had to take it into the show 6 times now. 2 times for Front Diff bearings and ring gear & pinion replacements. It was making noise in auto and 4H. About a year ago I took it in because of this knocking noise (video linked below). The noise is not related to speed or acceleration and I cant make it happen on command. The dealership has had my car for 3 days and didn't find anything. Anyone got any ideas? Quick notes: since taking it to the dealer I replaced both the front struts and now have 75K on it. The noise is still there randomly but doesn't seem to be effecting anything for now.
This is recorded from the front, driver side footwell. I was in 2W and I was driving straight on the highway at 70MPH. It was a flat highway (95). The noise has happened at lower speeds. It seems to happen randomly after sharp turning or heavy breaking.

 

 

SARNCAN Enthusiast

SARNCAN

Posted
Posted
Hey everybody,
About 2 years ago I purchase a certified pre-owned 2015 Tahoe with 56K miles. I have had to take it into the show 6 times now. 2 times for Front Diff bearings and ring gear & pinion replacements. It was making noise in auto and 4H. About a year ago I took it in because of this knocking noise (video linked below). The noise is not related to speed or acceleration and I cant make it happen on command. The dealership has had my car for 3 days and didn't find anything. Anyone got any ideas? Quick notes: since taking it to the dealer I replaced both the front struts and now have 75K on it. The noise is still there randomly but doesn't seem to be effecting anything for now.
This is recorded from the front, driver side footwell. I was in 2W and I was driving straight on the highway at 70MPH. It was a flat highway (95). The noise has happened at lower speeds. It seems to happen randomly after sharp turning or heavy breaking.
 
 


Does that noise come only at moving motion or even while the car is parked?
Charles1223 Enthusiast

Charles1223

Posted
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Posted
7 hours ago, SARNCAN said:

 


Does that noise come only at moving motion or even while the car is parked?

 

Only when I am in motion. It seems it happen more after turning with acceleration or after hard breaking.

  • 2 months later...
YukonJohn Enthusiast

YukonJohn

Posted
Posted

I have a 2015 Yukon XL Denali(87K) with the exact same sound. Mine is off and on, usually after braking(but sometimes during regular acceleration or driving), and almost always between 30 and 50 mph. Sounds like something is loose and swinging in the wind. It has no definite rhythm and always stops after a few seconds to a minute. Random MADNESS! I WILL FIGURE THIS OUT!

  • 3 months later...
Charles1223 Enthusiast

Charles1223

Posted
  • Author
Posted

Hey Everyone, I have solved the issue. Not sure how the dealer missed it after having it for 3 days but I replaced the Sway Bar links in the front and the noise is now gone. They had completely worn out and it was it'll I took them off that it became apparent. The part is $9 a piece on amazon. The Dealer wanted $80 for 2 of them. Hope this help!  MOOG Chassis Products K700538 SWAY BAR LINK KIT

IMG_0711.jpeg

  • Like 2
  • 1 year later...
YukonJohn Enthusiast

YukonJohn

Posted
Posted

Fixed! When reinstalling the throttle body boot from my air box after maintenance I discovered the bottom of the rubber boot was mashed and was not seated properly. It had been sucking air, dirt, etc for over 50k miles. It threw zero codes...WTH! The sounds were coming from inside my throttle body via the gap in the boot. 20k miles later my cam lobe on #3 wore out and exhaust valve wouldn't open. 180 compression on all cylinders except #3...130. #3 is not an AFM valve so that wasn't the issue. It was eating about 2qts every 3k mi. I got my hands on a 2019 6.2 with 20k miles for 6k and had it swapped and added a new torque converter for 3k. Running like a dream. Big expense but way cheaper than trading Yukon with a bad engine. I got the Yuk for a great price originally and still am far ahead of buying something now.

  • Like 1

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