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Discussion Starter · #1 · (Edited)
Okay, maybe this is a pretty typical post for help.

I’ve got a 2019 Rebel 5.7L (NOT eTorque) with 40k miles (second owner). There is a very noticeable drone/vibration at specific RPM’s (1400 and 1900), regardless of the speed and regardless of what gear its in. It does it in and out of ECO mode too. The noise fills the whole cabin, almost like the backpressure of having one window down at highway speeds. It’s definitely coming from the front end, but I don’t think it’s worn wheel bearings/diff/transmission/etc parts because it has made the noise at idle too.

I know, I know... "Didn't you read other forums before posting here?" "You're not the only person to have this issue, pal"

I have read other threads and tried fixing the issue already. I bought an ANC bypass harness but it did absolutely nothing. It sounds like a lot of people are having similar issues but other than a few who have had luck with cancelling the ANC, and a few more diagnosing Active Air Dam issues (the Rebel doesn’t have that), I haven’t actually seen anyone successfully fix it yet. I’m looking for some at-home diagnosis ideas because “bring it to the dealership” isn’t a great option at the moment. My truck is out of warranty and I can’t afford to spend a ton of money just to be told they don’t know what the problem is.
 

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2020 Rebel Rambox
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That’s very odd, but good information saying it does it while parked as well. That would eliminate tires and suspension components.
aftermarket exhaust? Different types of exhausts can drone you out. (Just throwing that out there, but I doubt it’s that)

easiest test would be to unhook the battery, let it sit for say 20 minutes, to make sure all capacitors drain down and the truck is truly dead.
reconnect and check if the issue persists. I say to try this as the computer “could” be introducing a weird timing issue, or air/fuel mix issue.

something else to check is motor mounts. It’s really hard to say sight-unseen, I do know “good” mechanics could track it down using a high end scan tool to see if there are irregularities at those specific rpms.

it could even be something as simple as a plugged cab vent.Just sounds like there’s an imbalance somewhere and it’s making the cab resonate when the frequencies line up wrong.
I’m really interested to see what you come up with. Grab a buddy and get to sniffin!
 
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Discussion Starter · #3 ·
Thanks for the response. I got fed up with trying to hunt down the issue and caved. It's at the shop right now. They heard the noise, which tells me I'm not crazy, but the best they could come up with was "tire noise". I have a really hard time believing that is the issue since 1) it's at such specific RPM's, and 2) it has happened while idling before. MAYBE it's a combination of tire noise and the fairly common ANC issue (which would explain the noise at idle)...

For now, its a tire rotation and an alignment. Try to check off the easy (and cheaper) fixes before getting crazy with it.
 

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Let us know what you find.
I personally, while leaving the dealership, would whip a u-turn if there was any sign immediately afterwards.
make sure you pick it up early in the day so the mechs are less likely to brush it off till tomorrow.
keep us posted. 👍
 
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