2019-2020 CX-5 GT Reserve and Signature 2.5T Engine Coolant Leaking TSB
- Thread starter sm1ke
- Start date
How did you notice the leak? My coolant level is getting lower over time but I don’t spot obvious leak yet.
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- Mazda CX-9 Signature
In my experience, it wasnt a slow leak. You'll know when it fails because you'll probably smell it.
It started as a slow leak, but it isn't slow anymore (we're not driving it, but I started it up recently just to move it and lost about a quart of coolant in a few minutes of idling).
My theory is that because of the plastic shield under the engine, the leaks land on the shield and blow off while driving, and unless you sit in one place for an extended period idling, there won't be enough on the tray to leak to the ground until the problem gets bad (there are lateral stiffening ridges on the tray that allow it to hold several ounces of liquid, but bouncing down the road and wind will remove it while driving).
Initially, we were seeing small puddles on the ground under the car. We wouldn't have noticed it if the undertray/splash shield were still in place under the engine. But the dealer had removed it looking for a clacking noise, and then never put it back on. (And I didn't notice that the shield was gone for several months, by which time the dealer denied that it was their doing. They also cracked the plastic cowl piece, likely from closing the hood with something on the cowl. Those two things were why I stopped going to the dealer for service, and not going to the dealer for service (for the past year) is one of the reasons that Mazda gave for not covering the repair costs).
Thanks for the info. I also drive a lot on highway. Recently the coolant level seems to drop faster. Now I just hope i found the issue within warranty. Mazda shouldn’t refuse to cover it just because you didn’t go to the dealer for oil change, especially if yours just passed warranty. You may want to call them again and try a different agent and mention that TSB if not done yet. This is their design issue and has nothing to do with oil changes.
I have an 18 and found out by accident that my waterpump was leaking when the Mazda dealer performed some other engine warranty work (switchable HLA's replaced). It wasn't a big leak, but I had noticed after I purchased the car (used with 19K kms. on it) that the coolant was a bit low.
Dealer replaced the pump and all's well.
Dealer replaced the pump and all's well.
roddster67
Member
I just got a 2019 Signature with 50,000k miles on it. It's on the bulletin from 10/15/2021.
The Credit Union guy gave me the CarFax to review but now I can't find it.
I remember looking it over and just noticing oil changes and tire rotations and such.
The engine compartment is extremely clean. Like brand new clean not dealer detailed clean.
I took it to the dealer to have a clunk from the front end checked out and an alignment and any software update.
They wanted $130 for the alignment and $200 to figure out the clunk. No joy trying to get them to tighten down whatever's clunking for FREE, as I bought my '03 P5 from them 20 years ago.
I didn't want to crawl around and mess with those covers underneath the vehicle.
I just paid $100 for the software update. Now it seems I'm getting worse mileage and I'm stressed out that I'll get the dreaded coolant leak.
Should've kept my P5.
The Credit Union guy gave me the CarFax to review but now I can't find it.
I remember looking it over and just noticing oil changes and tire rotations and such.
The engine compartment is extremely clean. Like brand new clean not dealer detailed clean.
I took it to the dealer to have a clunk from the front end checked out and an alignment and any software update.
They wanted $130 for the alignment and $200 to figure out the clunk. No joy trying to get them to tighten down whatever's clunking for FREE, as I bought my '03 P5 from them 20 years ago.
I didn't want to crawl around and mess with those covers underneath the vehicle.
I just paid $100 for the software update. Now it seems I'm getting worse mileage and I'm stressed out that I'll get the dreaded coolant leak.
Should've kept my P5.
How can you tell this issue is only on Signature and Reserve only? please help i am looking to buy one in canadaCX-9 2.5T Engine Coolant Leaking TSB
Moderator edit: This is a copy of a post originally made in another thread. This thread was created for easier reference. Mazda recently put out this TSB for coolant leak because of cracks in the cylinder head. As reported by many here it seems to affect the 2.5T 2016-2020 CX-9 as well as...mazdas247.com
Applicable to 2019-2020 Mazda CX-5 GT Reserve and Signature trims (refer to VIN range).
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- Plano, Texas, USA
Because this coolant leak problem caused by the cracked cylinder head is happening on the 2.5T which is only available on CX-5 Signature and GT Reserve. Mazda did modified the cylinder head and exhaust gasket to prevent the head cracking since 2021 CX-5 with the 2.5T.
Unfortunately there’s oil consumption problem from exhaust valve stem seals from the 2.5T on 2021 CX-5.
Oh I didnt realize you were talking about CX-5s. I was referring to CX-9s. I think all the trims have the tubo on CX-9s. Also reading the TSB it says "US spec" does this include Canada as well? Appreciate your help
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- Plano, Texas, USA
This thread is under CX-5 category and CX-5 does have 2 different engines. Unfortunately both suffered cracked cylinder head problem with different symptons.
CX-9 comes with 2.5T only. Hence the cylinder head on all CX-9’s from 2016 to 2020 MY will have older head which could crack and causes coolant leak. Canadian CX-9’s use the same cylinder head design, hence they will have the same head cracking issue with no exceptions.
Antoine
Administrator
Prefix was updated to match the current gen year range and can only be done across the board...Thread title updated (prefix removed).
Seeing there’s a lawsuit against Mazda for this issue and the affected cx5 is listed from 2019 to 2024 (so all cx5 with 2.5t):
So seems the change Mazda did doesn’t really fix the issue…
Plaintiff Matt Cauller’s class action lawsuit claims Mazda failed to disclose that its SKYACTIV-G 2.5T engines equipped in certain of its model year 2018-2021 Mazda6, 2021-2024 Mazda3 and CX-30, 2016-2023 CX-9, 2019-2024 CX-5, and 2022-2024 CX-50 vehicles were defective.So seems the change Mazda did doesn’t really fix the issue…
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- Canada
Or that the plaintiff is misrepresenting the affected models. As far as I know, the 21+ 2.5T models have not had any cylinder head cracking issues.
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- Mazda CX-9 Signature
I think there should be a disclaimer at this time since it's unconfirmed and not official
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- Canada
It's true that Mazda hasn't officially released a statement on their website - owners can check here for updates.
Some owners on other social media outlets have reported that they have spoken with their dealers about this service program and the dealers confirmed it.
