Rattling sound in eco mode

[Acesfull145]

I bought a used 2020 1500 5.7L etorque a couple months ago and it has this mild rattling sound coming from the back of the truck when crusing in eco mode. Only happens in eco mode and seems to be the most noticeable when slightly apply gas. As soon as eco mode switches off, it goes away. Took it to the dealership and they said they couldn’t recreate it. Anyone have this issue? Everything on the truck is stock

 

[Fatherof3]

You could try a higher octane fuel to see if it helps . Maybe the previous owner was using a low octane fuel ?

 

[Jako]

I bought a used 2020 1500 5.7L etorque a couple months ago and it has this mild rattling sound coming from the back of the truck when crusing in eco mode. Only happens in eco mode and seems to be the most noticeable when slightly apply gas. As soon as eco mode switches off, it goes away. Took it to the dealership and they said they couldn’t recreate it. Anyone have this issue? Everything on the truck is stock

There is a thread on the Active Noise Cancellation (ANC) and TSB.
I would have a problem with the ANC when I had people in the back seat. I loaded up the back seat with rubber maid containers and magazines when I took it to the dealership. It took 2 trips and TSB in hand to get it fixed under warranty.

see post #12

Loud humming noise and vibration

@Jako Ur welcome. I hear ya. I’ve had my share of Stealership issues. It’s disappointing and sad really.

5thgenrams.com

Best of luck and hope this helps.

 

[theblet]

Might be something loose, like exhaust. There is a lot more vibration when mds kicks in for me. Something to check. Good luck

 

[Acesfull145]

Might be something loose, like exhaust. There is a lot more vibration when mds kicks in for me. Something to check. Good luck

Thanks. This has to be what it is. Didn’t make sense at first why it would happen with mds on but not when it kicked off. Extra vibration makes sense though

 

[Bob.]

MDS does make more sound with an after market muffler. You could turn the MDS off as your cruising if it bugs you. Simply press the + - buttons on the steering wheel to kick the tranny out of the highest gear. MDS will stay off until you restart it, then you will need to do it again if you desire.
Try kicking the tailpipes to see if your tail pipe is touching the rear bumper or something.

 

[Prime1299]

Had a exactly same issue when switched to eco mode and light gas pedal pressure is applied rattling noise from engine is noticeable,
Just to mention used by mistake regular 87 octane when i made a switch back to primium 93 ostane noise was gone,
another thing to mention used regular fuel couple years back on the same vehicle no noise could be heard,
2018 dodge durango rt hemi 5.7l.
I also own 2019 ram no noise yet.

 

[Bpebler]

What @Bob. said

You can also keep it in Tow/Haul mode as I do but that’s personal preference.