2018 Mazda CX-9 - Ratings, Complaints and Recalls

"i recently bought a mazda cx-9 and noticed that my vehicle was slightly overheating. the coolant level was very low. i took it back to the dealership i bought it from and they confirmed that there was a crack in the cylinder head and are working on the repair. after further research, i am seeing this is common with these models. mazda is aware but not taking responsibility."

"cracked cylinder head verified by mazda dealer . noted it seems to be a very common problem with mazda cx9 2018 models and has multiple tsb on issue so i kept very close eye on car and took it in as soon as i smelled burning smell suggesting a leak , before the car had the chance to overheat and put myself and kids in danger. my car is under 40k miles for a 2018 with consistent maintenance - this is known problem since 2021 and needs to result in a recall."

"engine coolant leaking due to cracked cylinder head, found by mazda dealership service inspection and diagnostics. powertrain warranty only covers this until 80,000 miles, our vehicle is 116,000."

"cracked cylinder head resulting in no heat, leaking coolant and risk of overheating and fire. crack on backside of cylinder head near exhaust manifold bolts. weight of exhaust manifold is too much for the cylinder head and results in a crack around the bolt. cylinder head was casted too thin at the factory resulting in the head no being able to support the weight of the turbo and exhaust manifold. mazda is not covering the defect under goodwill when customer is outside of warranty even though it effects every 2.5 turbo engine made between 2015 and 2020."

"the contact owns a 2018 mazda cx-9. the contact stated that while the vehicle was parked, he observed condensation under the vehicle. the vehicle was towed to an independent mechanic where it was diagnosed that the engine needed to be replaced. the vehicle was repaired but the failure persisted. the contact stated that while the vehicle was parked, he observed condensation under the engine compartment and on the top of the engine. the vehicle was taken to an independent mechanic where it was diagnosed that there was a crack in the cylinder head and that the engine needed to be replaced. the vehicle was not repaired. the manufacturer was notified of the failure. the failure mileage was 68,000."

"my 2018 mazda cx-9 developed a rapid overheating issue which was determined to be caused by a cracked cylinder head. this was a known issue by mazda as noted in a technical service bulletin (mazda tsb 01-013/21). i've been told by mazda corporate and the mazda dealership where the car is currently parked that this bulletin means nothing and will they will not cover the cost of repair. my extended warranty is also telling me that they will not cover the cost of repair because they don't cover damage caused by overheating. even though the leak caused the overheating in the first place."

"coolant leak in the 3rd cylinder, causing the car to overheat and cracking cylinder head, making inoperable."

"we noticed a coolant leak and took vehicle in for service. told that engine has a coolant leak at cylinder head [xxx] . 5 year old vehicle, 56k miles. no other warnings. all maintenance has been previously performed as required. information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6)"

"as i was driving 26 mile trip to work i noticed a red light illuminated on dash indicating the temp was about 240-260. i pulled into the parking lot immediately turned car off. after work (8 hour shift) drove home temp stayed at 200-210. the next morning i took it to the mechanic i’ve used for years. he did a visual detailed inspection finding that the water or antifreeze in the radiator was low. the antifreeze in the over flow tank was about an inch or so above the “l” line. he said there may have been an air pocket in it, a leak, water pump or thermostat going out. watch the fluid levels daily, if the lower again take it to the dealership where i purchased it (4 months ago with 106k miles on it). i do have a 3 year or 30,000 mile warranty through the dealership. 4 days later i was very observant watching the temperature gauge. it went up to 240 briefly, so i got home and had my ex-husband check it. both the radiator and the overflow tank were bone dry. topped off radiator with antifreeze and the overflow tank to the “f” line. car had cooled and right before topping fluid started. there is no noticeable sign of a leak (smell, white smoke from exhaust, visible puddles of anything on the motor or the ground where i’ve parked. today is thursday 10/12 and i can’t get an appointment with dealership until tuesday. i’ve been reading a lot online about this being a very repetitive issue. in some cases new engine replacement required. mazda is well aware of not a few but numerous issues and complaints, a recall is needed for this situation. right is right and fair is fair!!"

"coolant leak not from radiator but from the engine"