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Discussion Starter #1
Last couple or so weeks has been interesting as two well known issues started almost at the same time. First was the noise from the rear in the 30 MPH range that sounds almost like the rear is driving on a steel deck bridge while the front is not. At first it started just faintly on wet roads now it is pretty loud and constant in that speed range. Switching to 4 lock or turning off traction control makes it disappear. So if I'm driving those speeds any distance I turn of the TC. So when I get a chance I will swing it by the dealership.

Second issue that has happened 2-3 times now is the Start/Stop light has come on and no our Jeep has not went more than a day without being ran. This one does not really concern me as I think there is a software update for it but light has to come on and stay on for them to look at.

We still really love our Compass but I have to say the rear hum,moan,rumble whatever you want to call it is uncool on a new vehicle and disappointing they will have to get this problem solved. I have owned a good number of 4wd-Awd vehicles over the years and know the typical sounds they make and what sounds signal a problem. This noise is not a good sound and I would be very surprised if some sort of damage is not being done. I'm lucky in fact we have a great dealership here with a great service department if there is anything they can do they will.
 

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Discussion Starter #3
2017 or 2018??

Doah need to finish filling out my info one of these days. It is a 2018 Trailhawk with just over 3k on the clock. I have seen these issues bought a few times before the noise here recently just thought it was a little crazy to have both the noise and the start/stop issue start at almost the same time as they are not related systems. I had posted before our Compass was behaving itself nicely with no problems then boom all this started. So it will be getting a trip to the sevice department in the next week or so. But from the post I have seen I'm worried the fix for the noise in the rear maybe elusive as many have stated there is a supposed software fix in the works for sometime now on both the Compass and the Renegade for this problem.
 

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Last couple or so weeks has been interesting as two well known issues started almost at the same time. First was the noise from the rear in the 30 MPH range that sounds almost like the rear is driving on a steel deck bridge while the front is not. At first it started just faintly on wet roads now it is pretty loud and constant in that speed range. Switching to 4 lock or turning off traction control makes it disappear. So if I'm driving those speeds any distance I turn of the TC. So when I get a chance I will swing it by the dealership.

Second issue that has happened 2-3 times now is the Start/Stop light has come on and no our Jeep has not went more than a day without being ran. This one does not really concern me as I think there is a software update for it but light has to come on and stay on for them to look at.

We still really love our Compass but I have to say the rear hum,moan,rumble whatever you want to call it is uncool on a new vehicle and disappointing they will have to get this problem solved. I have owned a good number of 4wd-Awd vehicles over the years and know the typical sounds they make and what sounds signal a problem. This noise is not a good sound and I would be very surprised if some sort of damage is not being done. I'm lucky in fact we have a great dealership here with a great service department if there is anything they can do they will.

Hi Chris Jacobs,

Thank you for sharing this. We regret to hear of these concerns, as this is not the experience that we want our Jeep owners to have! Please send us a message with your VIN so that we can document this further and see how we can assist.

Darlene
Jeep Social Care Specialist
 

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Ugh, another one of these
"the rear end makes a noise and I don't know what it is but I know for a fact its bad, cuz, its a noise :nosepick:"

:pat:


Listen, :extinguish:
The sound of the RDM actuator being either in a partially disengaged or engaged at rear / disengaged at front state is just a natural, normal sound that sometimes occurs due to the way its designed and it doesn't bother anything, and Jeep isn't going to bother to fix it either.

They have noted this sound from day one on the Renegade (all the same drivetrain and components in a different dress), its been blogged about by Edmunds and beat to death on the Renegade forums. One of the Renegade threads has FIFTY GD PAGES of discussion from owners worldwide. Their conclusion:


You don't have to like it, but as far as I can tell you and me and everyone else are stuck with it. If they haven't elected to fix it on something they've been producing for going on four years, it ain't gonna get fixed on your Compass anytime soon either.
 

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Discussion Starter #6
Hi Chris Jacobs,

Thank you for sharing this. We regret to hear of these concerns, as this is not the experience that we want our Jeep owners to have! Please send us a message with your VIN so that we can document this further and see how we can assist.

Darlene
Jeep Social Care Specialist

Thank you Darlene I'm going to run it by the dealer next week and see what they say they have been great with us so want to give them a chance and not make a huge deal over this yet.

I do wonder though if you can use your resources to give us an idea about if there is a software fix in the works or not for this issue that Compass and Renegades are having with this noise. As I posted people on different forums were told by their dealerships that Jeep is working on a software update would like to know from a more official source if this is true.

It starts around 30 MPH and is gone by 40 MPH. If the traction control/stability control is turned off or the 4wd lock is selected the noise will stop almost instantly and not return till you return to normal operation. Many owners of both the new Compass and Renegade with the 2.4 are posting exactly this same issue.

Thank again and if I have any issue with the dealer I will send you a message. :)
 

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Discussion Starter #7
Ugh, another one of these
"the rear end makes a noise and I don't know what it is but I know for a fact its bad, cuz, its a noise :nosepick:"

At this point I have to ask do you have a 4wd new Compass and does your make this noise/vibration?

I will mind you while I am not a certified mechanic I have been doing work on vehicles for a very long time. I have also owned many 4wd/awd vehicles as well as built them up and know the types of sounds to expect out of them like the clunk many new Compass owners have reported at 40 MPH. This is a prime example of a sound I would expect knowing this is the speed our Jeeps shift into FWD mode. Funny enough mine has yet to make this clunk and wonder if that is part of the problem improper 4wd disengagement.

Seriously the last vehicle I owned that made a noise even like this had a mangled center support bearing on the 2 piece drive shaft. It to would actually go silent at certain speeds by the way.

I would think if this were normal operation I would see a ton of post about it being normal on every post where this issue is brought up. Fact is it seems the majority of Compass MP owners are not experiencing this issue means ones that are have something wrong somewhere. I also would not expect a normal operating noise to suddenly start around 3000 miles. I promise you if this were normal operating noise and was present on test drive no one would buy a new Compass or Renegade it is just too loud and nerve racking at 30-40 MPH for a brand new vehicle.

We have a Suburban with 230k on it and the only driveline noise it has is normal part time-auto 4wd clunks these things have always made other than that the driveline is smooth and silent. I expect a new vehicle to surpass this or at least equal it.
 

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At this point I have to ask do you have a 4wd new Compass and does your make this noise/vibration?

I would think if this were normal operation I would see a ton of post about it being normal on every post where this issue is brought up. Fact is it seems the majority of Compass MP owners are not experiencing this issue means ones that are have something wrong somewhere. I also would not expect a normal operating noise to suddenly start around 3000 miles. .
What season did you buy it in? What season is it now? Conditions affect the active drive. temperature and moisture and ride conditions can all affect when that rear axle spools up. I had thought exactly what you were thinking up until I saw the videos explaining the dynamic nature of the system. If you're in a specific climate, you might never hear it. - Also bare in mind how many owners listen to the radio or music, or ride with windows down, or are just not as sensitive to low end pitch. - just trying to put some of the owners at ease here with another perspective.

LOL to arudlang who also said what needed to be said. I find it funnier because I was one of those nervous owners a few days ago. But after those 50+ pages and a few google searches I'm at ease. It was just new owner syndrome it would seem.
 

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Thank you Darlene I'm going to run it by the dealer next week and see what they say they have been great with us so want to give them a chance and not make a huge deal over this yet.

I do wonder though if you can use your resources to give us an idea about if there is a software fix in the works or not for this issue that Compass and Renegades are having with this noise. As I posted people on different forums were told by their dealerships that Jeep is working on a software update would like to know from a more official source if this is true.

It starts around 30 MPH and is gone by 40 MPH. If the traction control/stability control is turned off or the 4wd lock is selected the noise will stop almost instantly and not return till you return to normal operation. Many owners of both the new Compass and Renegade with the 2.4 are posting exactly this same issue.

Thank again and if I have any issue with the dealer I will send you a message. :)
Hi Chris,

If you send a message with your VIN, I can check if there are currently any software updates available for your vehicle.

Darlene
Jeep Social Care Specialist
 

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Discussion Starter #10
What season did you buy it in? What season is it now? Conditions affect the active drive. temperature and moisture and ride conditions can all affect when that rear axle spools up. I had thought exactly what you were thinking up until I saw the videos explaining the dynamic nature of the system. If you're in a specific climate, you might never hear it. - Also bare in mind how many owners listen to the radio or music, or ride with windows down, or are just not as sensitive to low end pitch. - just trying to put some of the owners at ease here with another perspective.

LOL to arudlang who also said what needed to be said. I find it funnier because I was one of those nervous owners a few days ago. But after those 50+ pages and a few google searches I'm at ease. It was just new owner syndrome it would seem.

What season did you buy it in? What season is it now? Conditions affect the active drive. temperature and moisture and ride conditions can all affect when that rear axle spools up. I had thought exactly what you were thinking up until I saw the videos explaining the dynamic nature of the system. If you're in a specific climate, you might never hear it. - Also bare in mind how many owners listen to the radio or music, or ride with windows down, or are just not as sensitive to low end pitch. - just trying to put some of the owners at ease here with another perspective.

LOL to arudlang who also said what needed to be said. I find it funnier because I was one of those nervous owners a few days ago. But after those 50+ pages and a few google searches I'm at ease. It was just new owner syndrome it would seem.

This years weather up here has been crazy since buying our Compass it has been driven in a bit of almost everything except heavy snow. No at colder temps this noise is not present which makes perfect sense knowing that 4wd stays engaged at these temps which is the same as using the 4wd lock selection. This noise can be present at or not at the same temperature. Example is the noise may not be there in a 35 MPH zone till you stop for a red light then start as you accelerate hit 30 MPH and it starts. Then you stop at the next light and when you accelerate the noise is gone or keeps making the noise all day. It very often but not always starts when de-accelerating and you hit just under 40 but it may do this once and be gone or stay like this the rest of the trip. There is no rhyme or reason or set conditions for this noise other then outside temps under 40*,turning off traction control or using 4wd lock which all will stop the noise.

Yes I am very tuned into what a vehicle I'm in is doing and on more than one occasion found issues with my own as well as friend's and family's vehicles that master mechanics simply could not figure out just by driving them or riding in them. It is not difficult for me to tell a bad noise/vibration from a benign noise/vibration. This noise is not something that sounds catastrophic right now but I'm sure extra wear on some part of the 4wd engagement system is being done.

I wish I had something that goes into how these systems are engaging the 4wd and transferring power front to rear. I know a lot of similar systems use viscous couplings and or wet clutches like Subaru. This noise sounds very much like a wet clutch issue where the clutch is not always fully disengaged and is lightly riding on it's pressure plate or plates. But I'm not sure Jeep is using this setup. But that would make sense as to why in temps where the 4wd is fully activated or the 4wd lock is used. Turning off traction control may also lock the 4wd or do something that makes the clutch fully release or what is driving the system disengage from another point.

Interestingly enough our last new vehicle had an issue with it's all wheel drive system as well with making noise it should not have. It used fluid to hydraulically actuate the rear drive the fluid got thinner and would only partially engauge the system. It would also sometimes whine like a bad/low on fluid power steering pump at times. After many complaints of this and complete failures the service interval was majorly revised for the rear differential. I don't recall the numbers exactly but owners manual stated fluid change for that unit was like 50k or 75k and new change was like either every 7k or 10k. This run up the cost of ownership greatly if you had them do the service at a price of ~200 bucks per change. It also made an engine noise at crazy low miles I knew was related to the timing chain had I not run it to the dealer they likely would have had to replace the engine instead it just ate everything in the timing chain system. Needless to say it was traded almost as soon as the warranty ran out!

I expect most 4wd vehicles to make some sounds like light clunks at certain speeds as the 4wd modes are changed. This sound is not one that one should expect or tolerate. I can hear it over the radio on low volumes. My wife did not really notice it till I pointed it out turning on and off the traction control while the noise was present. So yes I do suspect some owners are missing it but not enough to say every Jeep Compass 4wd is making this same noise and only a few notice it.

To be clear we love our Compass Trailhawk and I'm not knocking it just hoping this is something that will fixed at some point. It seems like even if this is mechanical in nature changing the software that changes some of what happens when the traction control is turned off in this speed range could do the trick.
 

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First of all: Sorry for bad english...not my native speak.

Same Issues here in Germany . My compass is currently in work to solve that problem.

Jeep ( here FCA ) well known that problem and called it a "software Problem , still working at it"


For me this "working" is way too long...

In my case the noise is very loud and i am afraid of any damages to the gear box because of the high speeds of ther gearbox .

Sorry Jeep ... for me this is not Acceptable in a car of this price level
 

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James High said:
What season did you buy it in? What season is it now? Conditions affect the active drive.
I think a combination of this ^ and how new the MP is makes up why we don't (yet) have 50 pages of discussion on this like the Renegades with the same drivetrain do.

And yes Chris I have a new MP Compass I drive every day and mine makes the same noise. I will grant you it is loud enough for people to notice, a buddy of mine riding with me noticed it while we were doing the 30-something MPH cruise down a town street and he is not really the type to notice anything with vehicles normally, but people jump to conclusions based on their experience. He immediately assumed it was the brakes dragging, nonsense of course but its not much different with the rest of us, we don't actually know anything for certain so we start guessing and making assumptions.

I prefer not to play my experience cards in forum discussion, for one thing I'm too old for that anymore but more importantly because it is hardly ever legitimate evidence towards anyone's point or opinion. As you yourself pointed out you have been able to find the source of issues where so called "master mechanics" could not. Thats wonderful, but it doesn't really support your position that this mystery noise indicates a major issue. If anything, it makes me think perhaps over-confidence is clouding your assessment on this.

Just to clarify, I'm not saying this noise it makes is good or that I am happy about it. Design flaw for sure, but indication of a major issue or of imminent failure? I don't think so, or at minimum I would say there is not enough evidence. As of yet I have not read any documented failures of the rear drive module that have been definitively associated with the sound/symptoms we are observing. (I think a couple have been replaced to try to make sensitive owners happy, but even the replaced ones were still working fine other than the noise) What I have read is tons of cases of people observing the noise but continuing to drive normally, and its early yet for our MPs but the BU Renegade has like I said going on 4 years of production so some of those have to have quite a few miles on them by now and they still seem to be going, so the only assumption I am making is that my Compass will too.

If not, who cares? Its under warranty anyways. I'll pay closer attention when the warranty winds down but for now I'm not going to bring it in and ask them to try to fix something that isn't actually broke yet. I wish a lot of things were done better on this car. The touchscreen should be more responsive, the engine should not have so much vibration at idle, the rear tires should be centered laterally in the wheel arches, there should be no incandescent bulbs anywhere but especially not in the taillights, and the ESS straight up should not be on this thing at all... but it is what it is. Its not perfect but its still a good buggy.
 

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Discussion Starter #13 (Edited)
I just found this and is confirms FCA is in fact very aware of this issue in the Renegade and being we share the same drivetrain they knew the issue would carry over to the new Compass as well. Since the post is dated 2015 I worry that this software update never came about or the issue would not be present in 2018 Jeeps. I'll send my vin to Darlene JeepCares to see if they can find anything out. But will still go to the dealer just to document this if nothing else incase it becomes a larger issue down the road or a fix is ever found they hopefully let us know. Like I said we love this Jeep but at the price we should not be having this type of noise and worry it very well may be a costly issue after warranty.

In this post the person has a pic of the info he received for this same issue on the Renegade from FCA and his Star case. It states clearly that they are working on a software update. The post is dated 9-15-2015 the letter in the pic is dated 7-16-2015.

Jeep Renegade Forum - View Single Post - Grinding/vibration/rumble Noise at ~30mph

http://www.jeeprenegadeforum.com/forum/attachment.php?attachmentid=19489&d=1442368839

Update to this post I have been continuing to dig and read through the Renegade forum from above as I have time and found this from a Jeepcares post. Interesting is that the same JeepCares post a few times about a software fix in the works then is apparently told by engineers it will involve a hardware fix. Then a post by a person that had whole whole rear diff and actuator replacement reporting 2500 miles noise free. I'm very curious at this point about all this and how it might relate to getting this noise issue resolved for us Compass owners with the same drivetrain and same issue.

http://www.jeeprenegadeforum.com/forum/379193-post122.html

"Okay, all, I finally have an update on this!

Per our engineers, the required repair for this is a replacement of the Rear Differential Module (RDM). It is a hardware replacement, not a software update. It is available now, but it will take some time for parts to reach dealerships and should be more widely available early next year.

This is information that is just newly being released, so please be aware that not all dealerships will be immediately aware that the fix is actually available. If they have any questions regarding the repair, our engineers should be able to assist in answering their questions if they reach out to them directly.

I'm excited about this one, I know it's been a long time coming for some of you and I've been anxiously awaiting a resolution to this myself!"

http://www.jeeprenegadeforum.com/forum/416513-post159.html

"On a positive note, 2,500 miles after the RDU (whole rear diff and actuator) replacement the noise is still gone."
 

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Thanks for the info Chris. I've taken mine in to the dealer a few weeks ago for a check up as my light message popped up again, but they had a jeep technician in working on a few cars and he mentioned that it was a design flaw they were addressing and would eventually happen, good to hear that the RDM will be replaced and hopefully the noise goes away. At this point, I guess it's a waiting game for a recall notice. For one, I had gotten used to the noise already. The jeep technician did say it was nothing to worry about it because as far as he could tell, it wasn't causing any damage in the renegades for how long their issue has been going so he didn't expect it to cause damage now. Now my problem that I'm facing now is finding a spare tire kit, I swear those don't exist lol
 

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Got this new Rear Differential Module (RDM) today.

Will see how it works tomorrow.

If it doesn´t work ...sorry then the car goes back to dealer . Legislation is clear for that in Germany
 

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Discussion Starter #16
Well we were planning a trip to the dealer and our Compass must have heard us talking about taking it to get it fixed and it has gone quite for a few days now and start/stop has been fine. No sense in taking it in till they have something to listen to. Crazy!
 

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Julio Villegas said:
At this point, I guess it's a waiting game for a recall notice.
There never will be a recall, the part functions fine so they aren't ever going to do anything about it (for whats already out there, good chance some future 2019+ model will get the part redesigned to be quiet)

KAMI_1 said:
After 2 weeks waiting i have it.. a new Rear Differential Module
and nothing...the same humming as before
Surprise surprise...

 

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Don´t know the laws in US but in Germany it´s possible to give the car back because of the possibility of further damages in future. In this case the high speed sound ...know one really can explain me that sound
And FCA well known that problem...well a "Software problem" ....if i hear Software i rember only VW*lol

 

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Awesome! Thank you so much for that. I'll just write out the most important part of that publication so its easier for a search engine to pull it up:

The sound is a normal design characteristic which should not affect durability.
How about one more time, for the people in the back:

"The sound is a normal design characteristic which should not affect durability."




 
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