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Annoying metal rattle sound but only at 48-50 mph

Discussion in '2.5 Gen Tundras (2014-2021)' started by GT87, Aug 4, 2022.

  1. Aug 4, 2022 at 6:14 AM
    #1
    GT87

    GT87 [OP] New Member

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    Hello all. I have a 2021 CM with about 15k miles on it and I'm having trouble locating the source of an annoying rattle. The crazy thing is that the rattle only rears it's ugly head when I'm at a constant speed in the 48-50 mph range. As soon as I slow down or accelerate out of that mph range it goes away. It sounds like its coming from directly underneath the truck. Definitely not coming from inside of the cabin or the engine bay area. Doesn't sounds like its coming from the wheel/brake areas either. Its hard to describe the sound but if I had to it sounds like a thin metal/tin sound. I know this is a shot in the dark but hopefully someone else had a similar experience and found a solution. Next step is taking it to the dealer but I'd rather avoid that.
     
  2. Aug 4, 2022 at 6:29 AM
    #2
    17TundraDCEd

    17TundraDCEd New Member

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    Does it rattle if you rev it in park?
     
  3. Aug 4, 2022 at 6:31 AM
    #3
    17TundraDCEd

    17TundraDCEd New Member

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    Or if you shift into N between 48 to 50 mph
     
  4. Aug 4, 2022 at 6:31 AM
    #4
    GT87

    GT87 [OP] New Member

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    Nope, only in that 48-50 mph range. Craziest thing...
     
  5. Aug 4, 2022 at 6:35 AM
    #5
    yamabob

    yamabob New Member

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    Maybe a heat shield vibrating?
     
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  6. Aug 4, 2022 at 6:37 AM
    #6
    GT87

    GT87 [OP] New Member

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    If I shifted into N the truck would start to slow down right away and the noise just goes away. Same if I let off the gas. Rattle only happens if my foot is held constant on the gas on a somewhat level grade. Any sort of acceleration or just let off the gas any it goes away.
     
  7. Aug 4, 2022 at 6:39 AM
    #7
    GT87

    GT87 [OP] New Member

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    That was my first though. I crawled under the truck and checked all the heat/exhaust shields and didn't notice anything loose. Maybe I'll crawl under again and be a little more thorough.
     
  8. Aug 4, 2022 at 7:06 AM
    #8
    17TundraDCEd

    17TundraDCEd New Member

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    Have you tried S mode. See if 48 to 50 in 4th gear 5th gear and 6th gear produces rattle in each gear
     
  9. Aug 4, 2022 at 7:29 AM
    #9
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Is it possible its coming from your engine bay on the firewall? There is a harness that has been known to make noise against the firewall.
     
  10. Aug 4, 2022 at 7:31 AM
    #10
    GT87

    GT87 [OP] New Member

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    I have not. Seems like the rattle only happens at the highest gear for that speed (assuming 6th gear) when the rpms are at the lowest (1100-1200 rpms).
     
  11. Aug 4, 2022 at 7:33 AM
    #11
    GT87

    GT87 [OP] New Member

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    Could be but it doesn't really sound like its coming from that area, more from the undercarriage. But at this point I'm not ruling anything out. Do you have anymore details on the location of this harness?
     
  12. Aug 4, 2022 at 7:37 AM
    #12
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Wish I had the truck right now to take a pic for you but its on the firewall, by the passenger side behind the engine, i beleive straight back form the intake tube of the airbox. There is a decent size wire loom going into the firewall.
     
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  13. Aug 4, 2022 at 7:39 AM
    #13
    GT87

    GT87 [OP] New Member

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    Cool, I will give it a look and see if anything feels loose.
     
  14. Aug 4, 2022 at 7:40 AM
    #14
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    I think a zip tie will take care of it, the harness loom itself would slap against the firewall.
     
  15. Aug 4, 2022 at 7:45 AM
    #15
    17TundraDCEd

    17TundraDCEd New Member

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    I did exactly this to fix the harness issue that @MadMaxCanon is describing. I’ll take and post a picture when I get a minute.
     
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  16. Aug 4, 2022 at 7:53 AM
    #16
    1lowlife

    1lowlife Toxic prick and pavement princess..

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    Pretty obvious but make sure your muffler pipe bolts are tight.

    I remember years ago on my 2014 all 4 of the front ones vibrated loose..
     
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  17. Aug 4, 2022 at 8:12 AM
    #17
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    I forget what that harness goes into, is it the PCM?
     
  18. Aug 4, 2022 at 9:09 AM
    #18
    17TundraDCEd

    17TundraDCEd New Member

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    Not 100% sure. Attached pictures for OP.

    CE522274-891E-4A8C-B4F1-F63A59B8B908.jpg B4E8E46B-5B79-49E1-AB22-C6F79CB407EE.jpg
     
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  19. Aug 4, 2022 at 9:11 AM
    #19
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Yup thats the one, might even be the ECU?
     
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  20. Aug 4, 2022 at 9:23 AM
    #20
    17TundraDCEd

    17TundraDCEd New Member

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    Zip tied it 3 years ago. Quiet since.
     
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