Transmission noise first to second and second to first?

FGR8FRK

MEMBER
2019 JEEP CHEROKEE
3.6L
6 CYL
4WD
AUTOMATIC
53,000 MILES

A month ago, my wife started hearing rattle. Today I test drove it and when it shifts up from 1st to 2nd and also when it downshifts from 2nd to 1st there is an audible rattle.

Sunday, July 28th, 2024 AT 8:58 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
46,907 POSTS

Can I ask where the rattle is coming from, front, center or rear? Please upload a video in your response of any problems so we can see what to help you with. It could be a loose heat shield or broken hanger for the exhaust system. Please check the image below to see what I am talking about and get back to me.

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Monday, July 29th, 2024 AT 9:51 AM

FGR8FRK

MEMBER
46 POSTS

I don't believe that is the issue. I've attached a couple of video's, the first is it upshifting the second downshifting. Always 1st to 2nd and 2nd to 1st. I hope you can open them

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Friday, August 2nd, 2024 AT 7:12 PM

KEN L

MASTER CERTIFIED MECHANIC
46,907 POSTS

Thanks for the videos, they help. I have seen this problem before, this is the drivetrain control module has gone out, but to be sure let's run a CAN scan to see if there are any codes stored. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is the location and how to replace the drivetrain control module in case a code comes up for it. Check out the images (below). Please let us know what happens.

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