2017 Mazda CX-9 engine problems

Related recalls

No recalls on file.

What owners say

1. Filed Jun 11, 2026MSEngine

   this is covered under csp11. the problem is my car is a 2017 and they only allow a warranty up to 120,000 miles mine is at 158000 and they will not fix the problem now even thought we just started having problems.

   NHTSA complaint #11743458 · source
2. Filed Sep 22, 2025UTEngine

   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…

   NHTSA complaint #11688886 · source
3. Filed Mar 26, 2025PAEngineSteeringTransmission & Drivetrain

   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…

   NHTSA complaint #11650724 · source
4. Filed Sep 11, 2024OHEngine

   My 2017 Mazda CX9 Signature Edition started leaking coolant from the engine near the firewall. I had a Mazda dealer investigate. They tell me the cylinder head is cracked and the entire engine needs replaced. This appears to be a common problem due to a design flaw and there is a Mazda service bulletin on it. I have found talk of a class action suit online because Mazda is not standing behind their product. I only have 88k miles on this car

   NHTSA complaint #11614058 · source
5. Filed Aug 30, 2024AZEngine

   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.

   NHTSA complaint #11611806 · source
6. Filed Aug 29, 2024MOEngine

   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.

   NHTSA complaint #11611627 · source
7. Filed Jul 12, 2024CTEngine

   July 10, 2024, antifreeze leaking from my engine leaking on garage floor. Yes, my safety was put at risk. July 12, 2024, local mechanic informs me that I have a cracked cylinder head coming from the back of the engine. July 15, 2024, vehicle will be towed to local Mazda dealership to have vehicle diagnosed. No warning lights, messages or any other symptoms of the problem prior to the failure. Happened July 10, 2024, at 3:50pm.

   NHTSA complaint #11601599 · source
8. Filed Jul 11, 2024TNEngineFuel, Hybrid & EV PropulsionOther / Unknown

   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…

   NHTSA complaint #11601259 · source
9. Filed Jul 2, 2024CTEngine

   This vehicle has been diagnosed as having the Cylinder Head Crack issue referenced in Mazda TSB 01-013/21. The car has just over 70,000 miles on it, so I understand it is out of Warranty, yet this issue only came up due to a known design flaw by Mazda. I have been told that I will be without the car for up to 9 weeks due to repair backlogs and the cost will be $5,250 plus tax!! This car has always been maintained at the Mazda dealership since purchase and has never had any…

   NHTSA complaint #11598338 · source
10. Filed Jun 24, 2024TXEngine

    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:…

    NHTSA complaint #11596268 · source
11. Filed Jun 6, 2024WAEngine

    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…

    NHTSA complaint #11592946 · source
12. Filed Jun 2, 2024CTEngine

    My car has never had any issues but began burning through coolant. After analyzing myself and then bringing to a mechanic, it has a bad cylinder head leak. This is a design flaw in the motors of Mazda cars during the years of the models with a 2.5 Turbo motor. This flaw will now cost me over $6k for a car just out of warranty when I religiously serviced the car at the Mazda dealer I bought it at in 2017. I cannot afford these repairs that were cause by a design flaw on…

    NHTSA complaint #11592018 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology