Humming (tread sounds - Jeep Compass Forum
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post #1 of 38 Old 01-15-2018, 12:49 AM Thread Starter
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Question Humming (tread sounds

Hi all,

In December I purchase a 2017 Jeep Compass Sport 4x4. I've really come to like the vehicle. However, I have recently noticed that around the 30mph range, I hear humming under the car. It sounds as though you are riding treads on the road. Figured it might be something that I would have to break in and didn't pay much attention to it. During a cold spike, didn't hear it at all. Out of sheer curiosity, I browsed the internet and found a similar thread on the renegade forum. It seems the problem is with FCA 9 Speed engine. From what they have figured, it tries to engage the rear axle and doesn't seem to do it correctly. Many people have taken it to dealers and reported it to Jeep without a resolve, seems the issue is still from 2015. A fix around it is to engage 4WD Lock, turn off Traction Control or go into manual shifting (which works every single time). Is this something I should take into the dealer and have them duplicate the issue? I'm under warranty and from what I've seen in the renegade forums, no fix has happened. Dealers have replaced diff, rear diff and bearings and no fix. They think it might be a computer issue. Is driving around with TC off necessarily bad? Any help would greatly be appreciated.

Thanks!
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post #2 of 38 Old 01-15-2018, 06:35 PM
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Noticed the same humming on our 2018 and also assuming it's transmission or diff-related. I could be wrong but it almost seems it happens when you're coasting around 35 mph (maybe it's another gear to save fuel?). Doesn't seem to negatively impact fuel economy so I don't think it's bearings or anything like that (one would think that would create drag).
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post #3 of 38 Old 01-15-2018, 07:03 PM
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Having come recently from a Wrangler this thing is very quiet to me. I too notice an occassional noise and think something may be wrong but am starting to think that it is so refined and quiet for most part minor noises I never would have noticed be it engine, transmission or otherwise are just standing out more.

Not saying you are not hearing something odd of course. With my bad luck at dealers I'd be careful before having them throw a bunch of stuff at it until I could have confidence they actaully knew what it was.

In other words, maybe that noise is just what these transmissions do and nothing is wrong.

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post #4 of 38 Old 01-15-2018, 07:33 PM Thread Starter
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I do notice it spikes at 35mph. Might be fuel economy. Is it bothersome? Of course. But I figure I could get used to it. I have no rush to taking it into a dealer as over in the renegade forum, there has been no luck. The compass is not the quietest of vehicles, until I hit the highway, then the engine is quiet as can be. It might be intentional and I'm just overthinking it.

I do love the vehicle, as it fits my needs perfectly.
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post #5 of 38 Old 01-15-2018, 07:37 PM
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Same sentiments here. Car seems to run fine, and it's not the quietest to begin with. Also glad to hear others are having the issue (especially people with Renegades that have been around for a while).
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post #6 of 38 Old 01-15-2018, 07:45 PM
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I Just noticed the same thing on my Wife"s new 2018 Compass. I heard what appeared to be the rear axle engaging and the slight hum that followed. It was snowing heavily so that is what I am thinking happened.
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post #7 of 38 Old 01-15-2018, 07:54 PM Thread Starter
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I haven't heard it in snow because it's been dry my way. I don't hear it under 36 degrees since it seems the computer auto engages AWD at that point and it's not troublesome.
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post #8 of 38 Old 01-15-2018, 08:13 PM
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Does the AWD auto engage in cold temps? My Charger AWD does, so I wouldn't be surprised. With that in mind I'm pretty sure it's been freezing temps whenever I heard it.
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post #9 of 38 Old 01-15-2018, 09:59 PM Thread Starter
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It does, yes. AWD auto engages since I don't hear it when AWD engages. I have noticed that turning off traction control or engaging 4WD or manual shifting automatically gets rid of the noise.
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post #10 of 38 Old 01-18-2018, 03:24 PM
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I have 18 inch tires and it starts exactly at 45, not around 45. It's only been past 40 degrees for one day in the past three weeks since I bought the vehicle, so maybe it is cold related. I will try to remember to report back after we warm up this weekend.
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post #11 of 38 Old 01-19-2018, 12:58 AM
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I have the Kumo Crugen Tires, and they are nosiey on different types of pavement.

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post #12 of 38 Old 01-19-2018, 02:24 AM
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16 costly car noises,this article may help you,https://www.bankrate.com/finance/mon...-noises-1.aspx

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post #13 of 38 Old 01-30-2018, 09:34 AM
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I also just bought a 2018 Jeep Compass and I am hearing the same humming noise. I have also noticed that if it making the humming noise and I have to come to stop it almost sounds like the jeep is going in a low gear. I have noticed it around 30 also. I have had it back to the dealer and they said it was normal. Has anyone else tried test driving another one to see if it makes the same noise? I just might.
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post #14 of 38 Old 01-31-2018, 05:22 PM Thread Starter
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Zippy, you are able to remove the noise by manually shifting, turning off traction control or enabling 4WD lock. The noise doesn't happen in low temps due to the computer auto engaging AWD. I'm waiting for the temps to rise up a bit in my area to report it to the dealership as well. Unfortunately recreating the sound is a hit/miss situation. Brother tested out a few in a dealership, Sport, Latitude and Limited and some made the noise, others didn't. The issue definitely happens in the FCA 9 Speed engine. One of the ones my brother tested out was a 6 speed and no noise was present there. I've been keeping up with the renegade forums, as well as Reddit and other forums and people have been driving it like that for months without issues. Of course, YMMV.
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post #15 of 38 Old 02-21-2018, 06:24 PM
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I noticed that it doesn't make this noise in warmer temperatures. It's not even a really loud noise, just something I might notice if the radio volume is low or off when I'm on the phone, and only right when I hit 45 mph.
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post #16 of 38 Old 04-27-2018, 11:16 PM
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I can tell you guys I'm in a brand new 18 compass lat 4x4 and it'd a 6 speed manual and I hear the humming at 35mph or so, mostly when slowing down. Sometimes when driving. My guess is that it's a way to keep the transfer case or some differential lubricated and opperating smoothly. Hell I'm probly wrong here, but I remember reading about Toyota 4runners thay would end up with 4 wheel drive unavailable, because the owners would go months, even years without engaging 4 wheel drive. The Toyota manual said you should get it into 4 wheel drive at least onfr every few weeks. Now in our case, maybe there's some kind of auto engaging differential that takes care of keeping the 4 wheel drive ready for use, so none of the un-used parts seize up from inactivity?
Add this comment to the many other speculative comments lol.
Hey, wouldn't it be in our best interest to just reach out to some Jeep website or magazine, and have them contact an engineer. If we're all noticing no matter what engine (pretty sure the same one used on both) or transmission, maybe this is just normal?
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post #17 of 38 Old 04-27-2018, 11:59 PM
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Quote:
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I can tell you guys I'm in a brand new 18 compass lat 4x4 and it'd a 6 speed manual and I hear the humming at 35mph or so, mostly when slowing down. Sometimes when driving. My guess is that it's a way to keep the transfer case or some differential lubricated and opperating smoothly. Hell I'm probly wrong here, but I remember reading about Toyota 4runners thay would end up with 4 wheel drive unavailable, because the owners would go months, even years without engaging 4 wheel drive. The Toyota manual said you should get it into 4 wheel drive at least onfr every few weeks. Now in our case, maybe there's some kind of auto engaging differential that takes care of keeping the 4 wheel drive ready for use, so none of the un-used parts seize up from inactivity?
Add this comment to the many other speculative comments lol.
Hey, wouldn't it be in our best interest to just reach out to some Jeep website or magazine, and have them contact an engineer. If we're all noticing no matter what engine (pretty sure the same one used on both) or transmission, maybe this is just normal?


I thought we were lucky as ours did not do this when we got it at 19 miles. But now over the last week or so it started at around 3k on the clock.

Your idea would sound like a good explanation except the way the Compass auto 4wd works. When the Compass is at speeds below 40 MPH(I think) it is in an AWD mode so all the engagement stuff is always working. Also switching off the traction control should not affect this. To me it sounds like maybe small wet clutch is being over ran. I don't know if we have this type of clutch in the system to distribute torque or not but that is what it sounds like.
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post #18 of 38 Old 04-30-2018, 01:24 PM
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[UPDATE 5/2/18] I've confirmed the rear drive axle engagement that causes the "hum" is able to be prevented by turning off traction control. I'd be fine with the hum if I hadn't already heard from 2 sources that the rear wheels / 4wd should not be engaging at speeds higher than 40, yet it happens often on my compass, so when I hit highway, I turn it off. I have more questions, but I think they're best for a Jeep tech. If I hear anything else I'll post up

[original post]
I heard it wind up and hum today on the way to work, this time going well over 50 mph. I'm about ready to type up an email and send it out to a few places, including a dealership, Jeep corperate, a few online Jeep enthusiast sites, etc. I'm still fairly certain the humming we hear is some kind of system doing it's job / something normal, but it'd be peace of mind to confirm this before more time passes.

I dug deeper. I read the renegade forum threat, (50+ pages now!), and I thought there was one post in particular that might put some of your concerns at ease, at least for the time being...until warranty expires lol. Basically, half way down the page, there's a fairly large post describing what is happening, and why. In a nutshell, it's a bit of what I had mentioned earlier, with the 4wd system prepping itself for potential use, which in turn, is why we hear a spool up and humming sound at various speeds and temps.
This post even touches on why the various suggested methods to eliminate it work, like turning off TC, etc.

http://www.jeeprenegadeforum.com/for...-30mph-49.html
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Last edited by James High; 05-02-2018 at 01:09 PM.
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post #19 of 38 Old 05-19-2018, 02:08 AM
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Just brought home by 2018 compass yesterday. I Was driving it tonight and heard this humming around 30-35mph. I figured it was normal, but it sounds annoying. I am going to try driving it with the traction control off to see if that helps. !
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post #20 of 38 Old 05-21-2018, 10:07 PM
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I turned off the traction control on mine and it completely stopped making the humming noise!
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post #21 of 38 Old 05-21-2018, 10:53 PM
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I turned off the traction control on mine and it completely stopped making the humming noise!


Yes turning off traction control,shifting into 4wd lock mode or moving the gear shift lever to manual mode all shut this noise off. Ours stopped making the noise for a bit but it has started up again sporadically. Waiting to see if it gets constant enough for the dealer to be able to replicate it. Not what I was expecting from a new vehicle.

If yours is doing this constantly enough for the dealer to hear it take it in and get it documented. Some on the Renegade forms have had their rear PTU or whole differential assembly replaced and that ended the issue. For others this same repair did nothing. I'm left wondering if there is something about the alignment of parts related to the rear diff that is the issue.
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post #22 of 38 Old 05-22-2018, 12:51 PM
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Just brought home by 2018 compass yesterday. I Was driving it tonight and heard this humming around 30-35mph. I figured it was normal, but it sounds annoying. I am going to try driving it with the traction control off to see if that helps. !
Hello mcld3034,

Are you planning on making your dealer aware of the humming noise? Let us know if we can do anything to help.

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post #23 of 38 Old 05-24-2018, 11:27 PM
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There is a technical notice (dated Feb, 20th) available to the Jeep techs in the Service Department of your dealership that defines the problem as a "normal design characteristic which should not affect durability." The running gear of the Compass is different than many of the other 4WD or AWD systems in FCA vehicles in that only the Compass (and possibly the Renegade) start out from zero MPH in 4WD regardless of the outside temperature or conditions. This means that from every stop sign in whatever temperature, the 4WD is engaged until the system is satisfied it can change to 2WD when underway. Once that happens and the outside temperature is above a freezing or near-freezing condition, the system shifts into 2WD. That is why the moan occurs some distance away from the stop sign after acceleration. I have an 2018 Compass Limited 4WD and find the whole thing very annoying for a fully equipped $36,000 car. It has been documented by the dealer but no fix is available from corporate.
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post #24 of 38 Old 06-01-2018, 08:39 AM
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same noise from belgium

Hi, I've just purchased a brand new 2018 Compass Limited 4WD and i've noticed de same noise around 55 to 60 Km/h (35 to 40 MPH).
I thought it came from a gear ratio (like 6th gear) but I do not know if it comes from there. If I'm sure it will not affect the reliability of my car, I do not care

Thank you

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post #25 of 38 Old 07-03-2018, 02:02 PM
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I have a 2018 limited compass and have the same issue. The noise has been there since 200 miles. I have had it into service for this issue a total of 2 weeks. My service center is close to an FCA proving grounds and a tech from there has been doing different things to remove the noise without success.

They have:

Installed a New drive shaft
Installed a new PTU
They have loosen my motor and moved it to take pressure off a shaft.

None of this has worked and now they are stating that is must be a software issue
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post #26 of 38 Old 07-04-2018, 01:51 PM
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That's unfortunate. They wasted a lot of money trying to fix something that isn't broken. But at least they tried.

So. Something makes noise when the 4wd is disconnected. A) noise is vibration, something must move to create that. WAG but it may be driveshaft vibration, even though they changed it - which just means they put in an identical part that does the same thing. While the shaft is connected it is ok because vibration is physically dampened (transmitted to the rear axle, but frequency stays lower than what we humans recognize as 'noise'). But spinning while disconnected creates noise. Basically they just need better balanced shafts or something to keep it dampened. Or perhaps not the driveshaft but some other part creating the noise for the same reason.

Further guess is that this is really obvious and FCA engineers long ago found the problem and proposed a solution. However it will cost some money and they have never been able to get the appropriate pointy haired managers to sign off on it. Meanwhile FCA wastes money changing parts unnecessarily and losing customers over it.
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post #27 of 38 Old 07-05-2018, 05:22 PM
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That's unfortunate. They wasted a lot of money trying to fix something that isn't broken. But at least they tried.

So. Something makes noise when the 4wd is disconnected. A) noise is vibration, something must move to create that. WAG but it may be driveshaft vibration, even though they changed it - which just means they put in an identical part that does the same thing. While the shaft is connected it is ok because vibration is physically dampened (transmitted to the rear axle, but frequency stays lower than what we humans recognize as 'noise'). But spinning while disconnected creates noise. Basically they just need better balanced shafts or something to keep it dampened. Or perhaps not the driveshaft but some other part creating the noise for the same reason.

Further guess is that this is really obvious and FCA engineers long ago found the problem and proposed a solution. However it will cost some money and they have never been able to get the appropriate pointy haired managers to sign off on it. Meanwhile FCA wastes money changing parts unnecessarily and losing customers over it.


I have mentally played around with this possibly being a driveshaft issue. I wonder if dynamic tension might be forcing the driveshaft into a sort of balance. Then when that tension is removed the shaft returns to an unbalanced state and creates vibrations and harmonics within the RPM it is spinning at the speeds we hear and feel the vibrations.

The next big question though would be why does it come and go even within the same temperature range when the auto 4wd should be performing the same? Something has come to mind is the fact I have read many times that replaced PTUs have had metal shavings in them. I wonder if these found shavings are just from the rear differential breaking itself in. But the shaving find their way into the PTUs clutch system and makes them spin the rear drive shaft some at a time it should not be spinning.

This also might explain why some have had whole RDUs replaced and the issue resolved either long or short term. Like anything each rear diff will break in differently and produce more or less metal particles. So I again wonder could a possible fix for this be some type of power flush of the existing RDU to force the break in material out of them. Maybe something as simple as 3-4 close RDU fluid changes after break in?

Subaru actually run into a similar issue with the 1st gen run of their new CVT transmission. Break in metal shavings found their way into the transmissions control body and set malfunctions that would cause critical failure. The newer gen of the transmission now has an internal filter to keep metal shavings out of the control body. This was one of the reasons I ruled Subaru out when car shopping. The only way to replace that filter is to remove and disassemble the transmission.

I swear one of these days I'm going to mount an old cell phone under our Jeep and have it record what the rear drive shaft is doing and when. Maybe that will shed more light on this.
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post #28 of 38 Old 07-06-2018, 01:16 PM
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Originally Posted by Branch16 View Post
I have a 2018 limited compass and have the same issue. The noise has been there since 200 miles. I have had it into service for this issue a total of 2 weeks. My service center is close to an FCA proving grounds and a tech from there has been doing different things to remove the noise without success.

They have:

Installed a New drive shaft
Installed a new PTU
They have loosen my motor and moved it to take pressure off a shaft.

None of this has worked and now they are stating that is must be a software issue
Hi Branch16,
We understand how an extended period of time at your dealer could be frustrating. We would like to offer our assistance while you are working with them. Send is a private message with additional details.
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post #29 of 38 Old 07-06-2018, 01:49 PM
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Originally Posted by Chris Jacobs
Something has come to mind is the fact I have read many times that replaced PTUs have had metal shavings in them.
"many times" ... psh, come now Chris, reading the same post over and over again does not count =P Seriously, can you link to more than two alleged instances of these metal shavings? Even if including the Renegade forums? I suspect not.

Quote:
Originally Posted by Chris Jacobs
This also might explain why some have had whole RDUs replaced and the issue resolved either long or short term.
Again, there is like, one maybe two posts along these lines that we know of. It is misleading to act like we have dozens of documented reports or something when we definitely do not, we have a couple vague posts with usually very little information or solid followup. Not enough to draw the conclusions you seem to have.
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post #30 of 38 Old 07-16-2018, 04:40 PM
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Humming noises

HI. I have a 2018 Jeep Compass and my first 9 speed transmission. I kept hearing the humming noises and didn't know what it was. I took it to my dealer this past weekend to find that it is a known issue with Jeep, "corporate" are working on a possible update to lessen the noise, but it didn't seem to be a guarantee. I am to check in at my dealer whenever i take my car in for oil changes, etc to see if there are any updates. It is said to be the RDU. Rear Driving Unit and something about 2WD engaing 4WD, etc.. There is nothing wrong with it, according to them, and the car is safe, the noise however is annoying. Someone on here did provide a link that explains a lot about it. I will be checking in here and there at my dealer to see if there is any known fix for this.
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