I took our vehicle into Mazda due to a coolant leak that could not be located. It had my wife stranded due to the vehicle overheating. Everything lined up with CSP11. The dealership is now stating that the vehicle has a blown gasket and needs an engine replacement. This is the issue covered by CSP11 except that the crack is in the wrong location. They haven't found the Crack but are denying the warranty due to the covered location not being the source. The vehicle only has 93000 miles on it.
2017 Mazda CX-9: engine overheating
27 of the 61 complaints about the 2017 Mazda CX-9 describe engine overheating.
- owner complaints
- 27
- of this car's complaints
- 44%
- recalls
- 0
Is there a fix? 60 service bulletins cover this area of the car. See below
Engine overheating by model year
What owners say
I was driving the vehicle on the highway when the vehicle started to overheat, lights started blinking, the car was smoking, losing power and acceleration. This car has a recall on the cyclindwr head which when cracks causing the car to loose coolant and oil. If it cracks while you’re driving especially on the highway the car will immediately loose coolant and oil thus causing a very dangerous driving condition. There was no indicator prior to the failure that there was anything wrong with the car. No check engine lights, no coolant lights nothing. Prior to this happening I smelled coolant in the car cabin , took it to my mechanic who tested the coolant system and found no leak. At the time he was unaware of the known issue these cars have with the cylinder head. The problem has been confirmed by Mazda and they notified me within the month of March of the problem and the extended warranty to replace the known manufacturer defect cylinder head. The Mazda dealer now has my car and acknowledges the cracked cylinder head caused the problem but said because I didn’t immediately stop on the highway and kept driving until I got to a safe location I was negligent and are refusing to fix the car which now has a blown engine, etc. it is available for inspection now at the Mazda dealer. My safety was put at risk because I could have died on the highway if the car completely stopped working, it was dangerous driving it when it first started happening because it started out of nowhere the car was fine I was driving 50+ mph and it started smoking, overheating etc. I could have also killed someone else. It is a disgrace that not only they won’t fix my car they want to say they won’t because I’m negligent? I drive my kids to and from school everyday do you think I’m going to risk their safety in an unsafe car? They should not only fix the car but compensate me for putting mine and my children’s lives at risk. A complete disgrace.
Vehicle experienced coolant leak also oil leak from rear of engine. Broken cylinder head due to turbo too close to head
Coolant leak cylinder head. It was running and i could smell coolant on the minifalda and it shout down.
My 2017 Mazda Cx9 was stalling and jerking while driving almost causing an accident but glad I was able to drive it home without causing an accident. Took the car to the dealership and was advised that it needs a new engine due to coolant leak. The coolant was going inside the vehicle.
The 2.5l turbo engine mounts are not manufactured strong enough to handle daily driving and torque under the weight of the turbo. This causing cracks in the block/head resulting in coolant leak, over heating, and full engine replacement.
My Mazda 2017 CX 9 apparently had a coolant leak. When we had our oil changed, we were told it looked like it was leaking from behind the turbo booster. As I was driving it yesterday, the car slowed to an almost complete stop on the interstate and a warning sign on the screen showed that it was overheating to a dangerous level. I immediately pulled over and allowed the car to cool down. I checked the coolant level and it was not very low at all, although I did add some coolant at that time. It continued to overheat and even blew tons of smoke out through the exhaust, so I had AAA tow to my home. After researching this, I have found that there was a bulletin posted in 2021 from Mazda about this very thing happening. My husband thinks that we may have a cracked block or a blown head gasket due to this overheating. This obviously could have caused me to have a wreck on the interstate by my car overheating and shutting down so quickly. We are scheduling to have it towed to our local Mazda dealer to let him do the $99 diagnostic. Based on what he finds, which we think will be confirming what we think it is, we will have to have a new engine put in my car due to a defect in manufacturing from Mazda. Even though my car has 130,000 miles on it and is technically “out of warranty“, we feel this is simply unacceptable and that Mazda should help us with this most definitely. I have so enjoyed my Mazda, and I feel that this is not something of my doing, but rather a defect on Mazda part and it should be addressed.
I noticed my 2017 CX-9 Touring was leaking coolant. It wasn't much but then checked the reservoir which is nearly empty. The car was overheating. I had it checked out by the dealer and initially I was told that it was bad radiator cap. This was fixed and resolved the initial overheating problems. The overheating issues resurfaced and took it a certified mechanic which indicated it was leaking from the engine block. The quote for repair was over $6000 See: Service Bulletin: 01-002/23
Engine head cracked and is still on car as of now. If engine overheats, engine can seize. The leak has been reproduced, but the head has not been removed for inspection yet. No warning lamps. A large puddle of coolant was noticed under the vehicle. From what I have heard is that the material is too thin and eventually cracks. There is a tsb that covers the issue, but since we've gone beyond the 5 yrs of the powertrain warranty it won't be covered. We are under the mileage limit. We lucky caught the leak before engine damage took place (as far as we know, since the teardown has not been performed. If the replacement head is "reinforcing" that area then a design flaw has been inferred and should be corrected to avoid serious injuries due to a seized motor.
I took my vehicle into the dealership service center to have maintenance and repairs done. I notified them to a coolant leak. They discovered that the engine has a cracked cylinder head and that the manufacturer is aware of the defect. They stated that they have new updated parts they will use for the repair so this will not happen again. At this time there is no Mazda warranty extension or recall that covers the cost of the repair.
There was a coolant leak on my Mazda CX9 Signature with a 2.5T engine, and when driving the engine temperature started increasing slightly before taking off and turning red. I had to pull off to the side of a busy interstate road very quickly and shut the vehicle down before it overheated any more. Once I got the vehicle to the dealership, they told me it was a cracked cylinder head leaking coolant, and that it was an extremely common problem for the 2.5T mazda engines around about 60k miles, and they were actively working on one in the shop where I was for the same problem. Mazda is not currently helping with engine swap or any repairs as a result and is sticking the customer with the bill.
On 11/21/23 Mazda dealership informed that coolant leak in my Mazda CX-9 had ruined the engine. Research on the coolant leak has found several other cases in CX-9 models. It has been alleged that the engines in these vehicles may be prone to coolant leaks around the cylinder head and exhaust manifold joint due to excessive forces. When an engine coolant leak occurs, the vehicle may rapidly lose engine coolant and cause the engine to overheat. It has been further alleged that Mazda is aware of the engine coolant leak defect but has not extended the warranty or provided a redesigned part free of charge. As a result, consumers may be forced to pay for costly out-of-pocket engine repairs to correct the engine coolant leak defect.
Service bulletins that may apply
- Engine
- Dear Mazda Owner: You are receiving
- Customer service program CSP12 - denso low-pressure fuel pump customer service program warranty extension
- CSP11 - coolant leaks at cylinder head warranty extension
- Please review the entire Dealer Email below announced on October 17, 2024 for full details regarding this...
- This Service Alert supersedes the previously issued M-Tip(s) listed below
- Coolant leaks at the cylinder head around the exhaust manifold (as shown below)
- Oil leakage from the drive belt auto tensioner and rattling noises from the engine compartment
Related recalls
No recalls on record for this model year.
Questions about the 2017 Mazda CX-9 overheating
Is engine overheating a common problem on the 2017 Mazda CX-9?
27 of 61 owner complaints about the 2017 Mazda CX-9 (44%) mention engine overheating. The model year with the most reports is 2018.
Is there a recall or service bulletin for this on the 2017 Mazda CX-9?
There are 0 recalls and 60 service bulletins for the same area of the car. Check them below with your VIN.
Other symptoms on the 2017 Mazda CX-9
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