There are 14 owner-reported engine complaints for the 2019 Mazda CX-9in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
- Coolant leak at cylinder head and turbo at only 63,000 miles. - Safety issue because no warning lamps or messages appeared and potential for car to overheat without coolant circulating in the system. Car could breakdown at worst time and location. Leaking coolant onto exhaust created potential for fire. - Problem has not been confirmed by dealer yet. Appointment is upcoming. - Symptoms of the problem were leaking coolant on ground, low coolant level, heater not working properly. - First appeared 1/29/2026.
1. What component or system failed or malfunctioned, and is it available for inspection upon request? ANSWER: Engine failure due to overheating. 2. safety & indicators: ANSWER: During evening rush hour traffic on a 3 lane highway my car went into a form of engine power saving mode while i had children in the vehicle; this was almost catastrophic form my family and the other vehicles around me. there was NO warning. there were no previous issues with my vehicle, this was unexpected. 3. technician review: this is a known issue with no warning: The technician inspected your vehicle and found a concerning issue with the engine overheating. They scanned the vehicle and found a trouble code P111A, indicating the engine coolant reached a temperature of 251.6 degrees Fahrenheit, forcing the engine into limp mode. Based on their experience, the technician believes the engine likely reached much higher temperatures, potentially causing internal damage to the engine block. After a thorough inspection, they found no external coolant leaks, but upon using a digital borescope, they discovered evidence of coolant entering and being burned off in Cylinder 3. Given the severity of the issue, the technician recommends replacing the entire engine to ensure the long-term reliability and extended life of your vehicle. Services completed: - Scanned vehicle and found trouble code P111A - Inspected engine and found no external coolant leaks - Used digital borescope to inspect cylinders and found coolant entering Cylinder 3 Recommendations: - Replace the entire engine
Car coolant warning light came on for a short time 5 min after starting car, then would go off. During severely cold days it would come on then go off once the car was warm. On 2/25/25 the coolant warning light appeared and stayed on. The car made loud rickety noise, as it warmed up. After driving 2 miles the car coolant light turned red and began blinking. An alert appeared saying car over heating. The car was stopped and smoke came out of the car. The car leaked blue/greenish fluid. Overnight the car cooled. The next day the car continued making loud rickety noise driving to dealership. Dealership would not honor extended warranty for coolant leaks at the cylinder. The water pump cracked, with coolant leak also causing the cylinder to crack and leak oil. Dealership is suggesting total engine replacement. The car has gone through its normal servicing with no reported issues of coolant leak or depletion. The engine overheated in a span of 2 miles after being parked for 8 hours. The car was
While driving on highway I get a message on my dashboard "High Engine Temperature/Engine Output may be limited" warning message. I pullover and see that the cooland is low. I wait for thee car to cool down and fill with coolant. After 5 minutes of driving, get the same message on dash. I had car towed to Martin Mazda in Delaware. Diagnosis is that I need a new EGR valve and new engine $13,000. How coincidental it has the same symptoms as described in TSB and manifests itself differently and not covered? I even had my vehicle towed to John Kennedy Mazda in Pennsylvania and diagnosis is coolant is leaking into my engine. Too much of a coincidence and I am not the only Mazda owner experiencing this. My car is part of the VIN for the Mazda Powertrain Warranty Extension Technical Service Bulletin 01-002/23 (Feb. 10, 2023). The Mazda Techs are trained to not diagnose as such not to be covered under the warranty due to the enormous economic strain it will put on Mazda corporation. Mazda gets around the class action suits by offering the Warranty Extension but not honoring it. Mazda needs to own up to their mistake and turn this Warranty Extenions TSB into an actual Recall. Will it take an actual stall of the Mazda affected vehicle on the highway causing deaths for some corrective action to be taken?
2019 Mazda CX-9 Coolant Leak. 1st warning light just discovered on June 10, 2024. Dealership quoted not under warranty and will cost $14,000 to replace engine. Mazda has an open TSB Technical Service Bulletin for this and many other Mazda's with the same engine- TSB-Coolant Leaks at Cylinder Heads, Bulletin # - 01-013/21 issued 10/15/21 (CRACKED CYLINDER HEADS). Need Mazda to stand by their product and remedy impacted owners.
Started with rough idle then got overheating msg on dashboard. After the diagnostics they found cracked cylinder head and quoted $6000 for replacement. Called Mazda USA and they denied our claim. Car is under 5yrs old & around 74k. While working on the car they noticed the turbo needed it to be rebuilt. Another $2k. There is TSB out for this and it’s a known problem, lot of others having/had same issues. Never had a car that needed an engine replacement even before car is paid off.
In June of 2022, Mazda issued a TSB for an engine flaw that cause coolant to leak in to the engine and significant overheating occurred. This overheating causes the head to warp. The TSB states that the only repair for this is a newer model engine. This happened to my Mazda CX9 and quite a few more. There are class action suits currently ongoing. Mazda never made its owners aware of the TSB. The car can shut down on the highway which is dangerous to all.
Large crack in cylinder head
The car has only 41k miles on it and the engine warning light came on. I had the car towed to Mazda and now it won’t start and it needs a new engine. (Which is on back order for months). It is covered under the powertrain warranty but does me no good if I’m without a vehicle, and making car payments on a vehicle that isn’t running.
Mazda has an open TSB Technical Service Bulletin for this and many other Mazda's with the same engine- TSB-Collant Leaks at Cylinder Heads, Bulletin # - 01-013/21 issued 10/15/21 (CRACKED CYLINDER HEADS) My 2019 Mazda is right here on the list: Mazda Dealer claims I have to replace the engine at a cost estimated at $12,000 us dollars no offer or solution to repair the cylinder head which is upward of $5,000.00 us dollars. cars under there warranty are covered. Many models across the country are leaving people like myself stuck with a major engine issue and Mazda admitting they have a problem without stepping up and supporting and paying for this high repair cost to correct the issue. Enclosed is a snip of the actual TSB Mazda sent to all their Dealers. I've researched this Mazda engine and there's cars out there with any where from 25k miles - 100k+ miles with this same issue Should be a Class Action Lawsuit. recall and Mazda needs to be honest with this most sensitive matter APPLICABLE MODEL(S)/VINS US Spec.: 2019-2020 CX-5 SKYACTIV-G 2.5T vehicles with VINs lower than JM3KF******830243 (produced before Jun. 9, 2020) 2016-2020 CX-9 SKYACTIV-G 2.5T vehicles with VINs lower than JM3TC******422801 (produced before Jun. 9, 2020) 2018-2020 Mazda6 SKYACTIV-G 2.5T vehicles with VINs lower than JM1GL******523967 (produced before Mar. 25, 2020) Same engine has a class action lawsuit against Mazda for burring engine oil they both tie together.
My 2019 Mazda CX-9 Signature has developed a coolant leak at the back side of the engine that is consistent with Mazda TSB 01-013/21. Coolant leaks down onto the oil filter and the exhaust where it's burned off. Currently, I can drive the vehicle, but I need to refill the radiator and coolant reservoir. I'm concerned about this developing into a catastrophic leak that could seize the engine or cause a fire from contact with the exhaust. This vehicle is still under the warranty period of 5 years/60K miles. I will initially contact the dealer regarding this issue.
The coolant was leaking due to a crack in cylinder. The car overheated and the coolant leaked into the engine. Mazda refuses to identify this as an ongoing issue with the Mazda turbo skyactiv models
The engine is leaking coolant i will be putting a 3rd motor in this car due to other 2 motor also have a coolant leaking and running hot i have contact mazda and would not stand behind there car
The contact owns a 2019 Mazda CX-9. The contact stated while driving 15 mph, she heard an abnormal noise. The contact stated no warning light was illuminated. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had been informed of the failure. The failure mileage was approximately 25,000.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026