2017~2025 CX-5 Rear Differential Failure

[cz5gt]

mine were not tight too except the front drain one.

torque spec seems 32-39 rear and 34-42 front. I put them at 34 rear and front at 37-38 ftlbs

 

[a69mach1377]

That 23mm socket will be in my tool box soon, jadmt!

 

[AL Cx5]

North Dakota is pretty cool when it comes to getting good gas. I don't change my air filter every other oil change (that would be about every 7000-8000 miles) but change it often.
View attachment 382208View attachment 382209

I'd like some of that 111 please! Then get a tune. I bet the tuner would dial in more timing!!!

Easy way to check, kinda old school. Ive see this method on Bo cats and track hoes. I have a spread sheet with part numbers, costs and such.

 

[philljazz]

Was the RD ever serviced? Did you drive through deep water?
Has to be more to the story then OP is posti

I had my rear differential replaced in 11/2025 for $4500. The same noise occurred and yesterday my dealer (John Kennedy, PA) claimed it was caused by water damage, and therefore MY FAULT (even though I had nothing to do with the design of the Mazda 3, and do not drive through ponds.) "Meranda" - the same customer service rep referenced above sided with the Service Manager. I demanded written documentation of where the water damage occurred, and will provide my story to the BBB and PA Attorney General's office. I suspect I'll have to seek out a local mechanic and hopefully find a used part. I do want Mazda to feel pain over this.

 

[nickswhip24]

I had my rear differential replaced in 11/2025 for $4500. The same noise occurred and yesterday my dealer (John Kennedy, PA) claimed it was caused by water damage, and therefore MY FAULT (even though I had nothing to do with the design of the Mazda 3, and do not drive through ponds.) "Meranda" - the same customer service rep referenced above sided with the Service Manager. I demanded written documentation of where the water damage occurred, and will provide my story to the BBB and PA Attorney General's office. I suspect I'll have to seek out a local mechanic and hopefully find a used part. I do want Mazda to feel pain over this.

what,not even a year.......did they have any fluid in it....are your tires the same size.....something very very wrong....stop talking to the dealer and contact corporate...

 

[Kedis82ZE8]

Anyone know where the diff vent terminates in the rear area of a 3 AWD? I wonder if there is a rare issue with a car wash that allows water in like the ‘13-‘16.5 CX-5 models?

Reference

K

2013~2016 Post in thread 'CX-5 Rear Diff and Transfer Case Fluid Change: Tools, Parts and Links'

Dec 5, 2021

I've ordered the replacement diff breather/vent hose mentioned in TSB to address that potential problem

https://static.nhtsa.gov/odi/tsbs/2016/MC-10186908-9999.pdf

KE02-27-090

Wonder if that is what caused Unobtanium's rear diff failure years ago?

CX-5 Diff, and how mine died like a dog.

My AWD light came on the other day, and my AWD was subsequently not working at all. A trip to the dealer resulted in the finding of several "weird" non-functional "gear ratio" codes (what I was told). A new diff was ordered from Mazda, and the entire rear diff was replaced. Upon failure...

mazdas247.com

• Kedis82ZE8

• 

 

[N7turbo]

Anyone know where the diff vent terminates in the rear area of a 3 AWD? I wonder if there is a rare issue with a car wash that allows water in like the ‘13-‘16.5 CX-5 models?

Great. I do an underbody spray a few times a year, mostly as we're coming out of winter. Hope I never have this issue.

 

[AL Cx5]

Anyone know where the diff vent terminates in the rear area of a 3 AWD? I wonder if there is a rare issue with a car wash that allows water in like the ‘13-‘16.5 CX-5 models?

Reference

K

2013~2016 Post in thread 'CX-5 Rear Diff and Transfer Case Fluid Change: Tools, Parts and Links'

Dec 5, 2021

I've ordered the replacement diff breather/vent hose mentioned in TSB to address that potential problem

https://static.nhtsa.gov/odi/tsbs/2016/MC-10186908-9999.pdf

KE02-27-090

Wonder if that is what caused Unobtanium's rear diff failure years ago?

CX-5 Diff, and how mine died like a dog.

My AWD light came on the other day, and my AWD was subsequently not working at all. A trip to the dealer resulted in the finding of several "weird" non-functional "gear ratio" codes (what I was told). A new diff was ordered from Mazda, and the entire rear diff was replaced. Upon failure...

mazdas247.com

• Kedis82ZE8

• 

Has anyone been told or found water in their differential?

Have folks checked the diff level and changed the fluid on 30,000 mile increments?

I see a class action lawsuit with Mazda over their lack of providing a maintenance schedule and some differentials come from Mazda low on fluid.....

Mazda has the same physics as others. Lips seals let fine dust in that act as an abrasive. Their overpriced diff fluid is not magical.

Next time I'm under my CX5 I'll look for one. I've personally lowered the rear cradle assembly and didn't see a vent. Is the 3 diff that much different from a 5?

The Domestic IRS rear differential I changed out didn't have a vent hose either. My 2500 truck differential doesn't have a vent hose nor my Dana 60 tank of a diff in my drag car...

 

[jadmt]

Has anyone been told or found water in their differential?

Have folks checked the diff level and changed the fluid on 30,000 mile increments?

I see a class action lawsuit with Mazda over their lack of providing a maintenance schedule and some differentials come from Mazda low on fluid.....

Mazda has the same physics as others. Lips seals let fine dust in that act as an abrasive. Their overpriced diff fluid is not magical.

Next time I'm under my CX5 I'll look for one. I've personally lowered the rear cradle assembly and didn't see a vent. Is the 3 diff that much different from a 5?

The Domestic IRS rear differential I changed out didn't have a vent hose either. My 2500 truck differential doesn't have a vent hose nor my Dana 60 tank of a diff in my drag car...

there is a vent line on the top I do not know where it terminates at. it is a very small line.

 

[Kedis82ZE8]

Probably terminates in similar areas as the ‘13-‘16.5 models.

Former member hear with a ‘14 CX-5 IIRC… lost his diff from water intrusion.. TSB was unknown at that time years back.. he thought a water crossing but I think it was from a car wash

I change my front transfer and rear diff on 30k mile intervals.

 

[Kedis82ZE8]

Diff hose I used on mine shows as compatible to at least ‘25 CX-5

https://www.oemvehicleparts.com/oem-parts/mazda-differential-vent-hose-ke0227090a