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    2021Yukon/ Intermittent rattle under truck at low speeds

    Not out of warranty yet so I had my local dealer take care of it. I did however buy the replacement rings/gaskets just in case I need them after my warranty expires.
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    21 Yukon bad wheel bearing with only 30000 miles

    I’m getting the same clicking noise on my 2021 Yukon XL also at 30,000 miles. Took it to my local GMC dealer and their techs say the clicking is normal when the vehicle is on the lift or jacks. The clicking goes away when the bearings have load on them. I call BS. Here’s a video of mine that...
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    2021Yukon/ Intermittent rattle under truck at low speeds

    Good news everyone! I found the source of the rattling/squeaking and exhaust smell in my vehicle. I put my Yukon on my lift and started shaking and banging at the exhaust pipes. Ultimately I heard the rattling noise which was coming from the flange where the driver side exhaust manifold meets...
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    2021Yukon/ Intermittent rattle under truck at low speeds

    My big baby. Would hate to let her go over reliability issues.
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    2021Yukon/ Intermittent rattle under truck at low speeds

    Yes! If I don’t sell my truck by the time my warranty expires, I will definitely switch back to a reliable gas guzzler!
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    2021Yukon/ Intermittent rattle under truck at low speeds

    Now if I could just get the dealer to use their high tech troubleshooting tools and prove that ignition timing, fuel ratio, power bands, etc are still within spec. I’m under the impression that I can only take something completely and obviously broken to them for repair and not something that’s...
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    2021Yukon/ Intermittent rattle under truck at low speeds

    I’d say I’m loving the fuel economy of my 5.3L but it’s not worth it if my family and I may get stranded far from home again.
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    2021Yukon/ Intermittent rattle under truck at low speeds

    I’m also suspecting the torque converter to be an issue. One other issue I reported and forgot to mention was shifting between gears under load (such as going up a hill) is getting harsh. You feel a slight jerk after every gear change.
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    2021Yukon/ Intermittent rattle under truck at low speeds

    I actually mentioned to my service advisor to emphasize the shaking of the transfer case and the exhaust pipe but he and the techs were so fixed on replicating the issue. I called GM customer support and was also directed to try another dealer. So I’ll give the next closest one a shot at...
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    2021Yukon/ Intermittent rattle under truck at low speeds

    One of my suspicions too. I’ll take a look as soon as I get my truck on my lift. I just find it coincidental that the rattling coincides with a drop in RPM or if when DFM turns off cylinders.
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    2021Yukon/ Intermittent rattle under truck at low speeds

    Thanks for your input Thrust! So the dealer had the truck for three days and had two of their top technicians watch the video and inspect the truck while it’s on a lift. They took it for a test drive and claimed they didn’t hear anything out of the ordinary. Apparently, my video was not...
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    2021Yukon/ Intermittent rattle under truck at low speeds

    Good idea. Thank you!
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    2021Yukon/ Intermittent rattle under truck at low speeds

  14. P

    2021Yukon/ Intermittent rattle under truck at low speeds

    Hello Everyone, I have a 2021 Yukon XL with 29k miles on it. Just recently I noticed while driving around my neighborhood, I would hear what sounds like metal hitting metal. I slapped my go pro with an external mic under the truck and the rattling was more clear. The rattling seemed...

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