Sadly my 2017 Mazda CX5 has a failed rear differential. After researching, it sounds like this is a common problem. Shame on Mazda for not correcting the problem or issuing a recall. I've been driving Toyotas for a long time and decided to give Mazda a chance. I'm wondering if that was a mistake.
Thoughts?
Should I fix the Mazda and sell it to return to Toyota? Is this going to be the first of many expensive repairs?
Would you recommend a rebuilt, used or new differential?

 

Common problem? I have been on two CX-5 forums for years and your post is the first I have seen about a rear diff failure. Not sure how "common" it is.

 

First welcome to the forum

Its not a common problem.

Not sure where this sort of information was gathered or concluded? Don't bother answering that it is likely going to be debatable. Unless you have a TSB or some consumer report to share otherwise its hear say BS.

Maybe if and when you join future vehicle forums don't be so negative and have more questions than "FINGER POINTING" an unsubstantiated fault cause?
And I suggest never threaten to sell a vehicle on a specific platform forum with another auto manufacture.

How about a little vehicle information to start with.

Mile on ODO
when and what was the last general service done
Do you have a tow bar and have to towed at any time with it
If a tow bar was on it and your purchased used, do you have any pictures of the tow bar assembly and ball?

 

I can't even recall the last time I heard someone had an issue with the rear differential on the CX-5... but yah more info is needed as @Callisto said.

 

As everyone else confirmed, this isn't a common issue. It is unfortunate. Was it a crack in the case?

 

Um... (here we go again ) maybe you should read post #1 again slower and consider how it was worded? A failure is not a crack. A crack would be either from impact or abnormal tortional stress placed on the case. There is one other way but I will reserve that for the moment because it invites more unsubstantiated speculation . A crack would not be a defect based on the years service use. However until the OP returns and at least answers a few questions a CRACK is highly unlikely, and I would venture to say had it been that it would have been mentioned anyway?.

 

Some basic research would lead you a publicly available Mazda bulletin on rear differential cracks requiring differential replacement. There are even some theoretical causes referenced in the bulletin. In your previous post you had asked if there was a bulletin which there is. In the USA manufacturers are required to supply the NHTSA manufacturer communications as USA based consumers have rights to use those communications as they see fit. Bulletins can help owners with repair cost negotiation.

I still don't believe the issue is widespread but enough cases made it to MASH that they issued a notice for dealers to help with replacement approvals should warranty apply. A tip for the future: a little time researching can help avoid embarrassment.

MC-10232301-0001.pdf

 

You still don’t get it? First I never said there wasn’t a bulletin and I did ask for more information. And your reading comprehension is very poor as I said we have been on this road before. lol..
your information imho is what causes people to prematurely get the wrong advise or build confusion. Try to collect more information in the future otherwise I would warn members to be careful with any information you post


Read clearly the service alert provided, it states and is worded with description crack. Not failure , These are 2 different things

 

After reading the entire bulletin it appears to me this issue is mainly brought on by inappropriate use/behavior/storage by vehicle operator.
The OP apparently hasn't been reading about the issues Toyota has been having recently.
It has numerous recalls so far for 2024 and has stopped shipment of certain models because of irregularities in certain certification test.
And this comes on the heels of Daihatsu, a carmaker owned by Toyota, halting domestic production after admitting it had forged the results of safety tests for more than 30 years. And Toyota is still having recalls for the 2024 airbags on Grand Highlander and Lexus TX. Tundra pick-ups and Lexus SUVs are being recalled for debris that may be loose inside their relatively new V6 twin-turbo engines. And those are just the tip of the iceberg.

 

Maybe why I was earlier asking (post #3) about the possible towing equipment.