[S3ntoacx50]

Have an appointment next Tuesday to check this out.
Not sure how long this has been happening bc today is the first time driving with windows down..
The sound is centered..sounds the same from drivers/passenger seats. Kinda of a creaky metallic sound not super loud but definitely there..like a row of nails in a section of tire as it rolls. Hard to hear above 10 mph. But below that especially driving by a wall ill hear it even below 1 mph. Now thats it on my radar i can barely hear it from inside the car with everything off and driving slow.
Tires check clear. Brake rotors have no unusual marks. ..car has power accelerates good no shifting issues..
Im worried it could be the rear differential.

 

[FLCX50]

Have an appointment next Tuesday to check this out.
Not sure how long this has been happening bc today is the first time driving with windows down..
The sound is centered..sounds the same from drivers/passenger seats. Kinda of a creaky metallic sound not super loud but definitely there..like a row of nails in a section of tire as it rolls. Hard to hear above 10 mph. But below that especially driving by a wall ill hear it even below 1 mph. Now thats it on my radar i can barely hear it from inside the car with everything off and driving slow.
Tires check clear. Brake rotors have no unusual marks. ..car has power accelerates good no shifting issues..
Im worried it could be the rear differential.

Does the sound increase/decrease with speed changes?

I had a little bit of a creaking noise at first, but it was just the foam around the spare tire not sat in correctly after the hitch was installed.

 

[S3ntoacx50]

Above 10 mph it disappears it seems or the sound just blends in. Below 10 is when i hear it..if im coasting down a hill at 1 mph it makes the same sound just in slower motion..again like a row of nails in a section of tire. Sometimes its much more noticeable sometimes not as much. It's really strange actually..

 

[FLCX50]

Above 10 mph it disappears it seems or the sound just blends in. Below 10 is when i hear it..if im coasting down a hill at 1 mph it makes the same sound just in slower motion..again like a row of nails in a section of tire. Sometimes its much more noticeable sometimes not as much. It's really strange actually..

It could be a faulty tire. It may not look like there is an issue but an imperfection is causing you to hear it.

I would be surprised if it was a hub or differential as the noise would typical be heard at higher speed.

 

[FLCX50]

Above 10 mph it disappears it seems or the sound just blends in. Below 10 is when i hear it..if im coasting down a hill at 1 mph it makes the same sound just in slower motion..again like a row of nails in a section of tire. Sometimes its much more noticeable sometimes not as much. It's really strange actually..

Just had a thought. There are no labels hanging off the drive shafts right?

 

[LeeShadow]

It doesn't sound like bearing noise, but just in case there's any relevance, there's a TSB for our vehicles warning dealers about not mistaking it for other factors:

"SA-006-22 Summary: There have been warranty claims submitted for growling or bearing whine noise in differentials, transfer units and transmissions where the source of the noise was a wheel bearing. This misdiagnosis can lead to multiple repair attempts, warranty debits, and additional inconvenience and/or cost to the customer. To reduce the chance of this occurring, please follow the steps outlined in the repair procedure."

 

[S3ntoacx50]

So i went for a drive and drove the shits out this car. Letting it shift in sport D mode. Taking clover leafs testing my tires. Actually trying to break this suv. First, the sound wasn't there anymore after 45 minutes which is bizarre but good news. Second i can say the new tires are a very nice upgrade. My old Audi i could hit 60 on a certain clover leaf..i was doing the same in this SUV! Its so flat and likes mid corner throttle..
Im still puzzled by this. Didn't do the dealer visit because the sound is gone. Im pretty mechanical and was certain on this but seems i completely wrong. In a good way 👍😎

 

[S3ntoacx50]

Update on this. I took the cx 50 to the dealer the beginning of November to check out this sound. As the sound came back but still intermittently..they couldn't find anything and of course being at the dealer the car was behaving perfectly. In the last week the sound was much more consistent so today took it back to the dealer to let them check it out. They heard the sound, videotaped it. Results: new rear differential needed. Current miles 2000
The dealer has been awesome especially not even having a place to work out of. Cant wait for the new place and my future cx 70👍

 

[Litfuse]

I know people on the Mazda 3 forum talk about rear differential issues often. I imagine it is the same diff in our cx50.