Active tuned mass module

B-Train · Oct 29, 2021

I have a '21 Big Horn that I bought in March. I constantly get an indication that Active Tuned Mass Module Temporarily Unavailable. Sometimes it happens within minutes of starting the truck. Sometimes, I drive for 30 minutes before it comes on. Sometimes, it comes on multiple times if I drive for an extended period. I can't really find any information about this online. Does anybody have any idea what this is? Thanks.

chopperman1 · Oct 29, 2021

You should be under warranty, let the dealer fix it! As far as what it is, it's an electonic noise dampening unit usually mounted on the frame. Really just for user comfort in the cabin.

Here's a decent link for reference: https://www.underhoodservice.com/what-is-this-on-the-frame-rail-of-the-new-dodge-ram/

GTyankee · Mar 30, 2023

now this may be what they use

184a9ca25929cf8b532d58053ae2376d-jpg.416114

Back in January 2019

klodge741 a Ramforum member wrote

Active Tuned Mass Modules, ATMMs, which are essentially little cans bolted to the frame rails on either side of the truck, with solenoid-activated weights inside.
As the HEMI engine’s Multi-Displacement System kicks in, and sends the truck into four-cylinder mode, an underhood sensor picks up unwanted vibrations, and triggers these ATMMs to shake their internal weights in a way that’s 180 degrees out of phase with the engine’s unwanted vibration, thus canceling it out and yielding a smooth experience for occupants. This concept is called destructive interference, and it requires tweaking to the ATMMs depending upon the frame length.

djboo16 · Aug 8, 2023

have you solved this problem already?
If it has been resolved, please let me know the cause and how to resolve it. I've been struggling with the same issue for a long time.

Active tuned mass module

B-Train

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chopperman1

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GTyankee

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klodge741 a Ramforum member wrote

djboo16

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Active tuned mass module

B-Train

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chopperman1

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GTyankee

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klodge741 a Ramforum member wrote​

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djboo16

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klodge741 a Ramforum member wrote