Coolant leak from a cracked cylinder head that mazda is aware of and released a TSB about. Refusing to extend warranty or fix due to being 6 months out of 60 month power train warranty. Still under 60,000 miles.
2017 mazda CX-9 engine problems
moderate 33 complaints filed with NHTSA · avg repair $3,100
Complaints
33
Recalls
0
Crashes
0
Avg fix
$3,100
What owners are reporting 14 most recent
2017 Mazda CX 9 signature engine failure at 89,000 miles. July 2021 check engine light came on, this was three months prior to failure. Was told it was a known computer issue and was charged over $200 to fix. November 2021 car started running hot while driving down the road. Red thermostat came on while driving. Was able to get the vehicle to the Mazda dealer that has done routine service on the …
This problem has been documented and know by Mazda for awhile. They are aware that their 2.5 Turbo liter engine has the problem of cracking the cylinder head due to some overweight of the same engine component. My Mazda local dealer already inspected the car and told me that the fix is replacing the whole cylinder head, which with them would cost me 3.5k. My warranty company, which I purchased whe…
Coolant leak. Cracked cylinder head in a stud hole of the exhaust manifold. 70,000 miles Seems to be a problem with many other owners.
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 los…
I was driving to work with my daughter and my engine overheated out of nowhere and caused us to almost be rear ended
Leak from cylinder head caused by overheating. Reported a coolant leak prior to diagnosis. Car now shows an over heat code. Safety was put at risk due to immediate need to pull over and no longer able to drive the vehicle. Dealership and initial shop had different diagnosis of the vehicle. Shop advised of a head gasket leak only. Only warning maintenance light came on as car began to overhe…
2017 Mazda CX-9 with crack in engine with coolant leaking out. Informed by mechanic that coolant was leaking out from the engine and was caught by heat shield. I smelled coolant, but never saw any on the ground. Per TSB 01-002/23 there is a crack that can develop in the engine due to stresses from the turbo/exhaust. A crack will develop near studs in the engine. Once crack develops, the coolant ca…
coolant leaks from cracked cylinder head which cause the car to overheat and have the engine stalled on the highway.
My car gave me a warning that it was overheating... and gave me a warning to pull to the side of the road because of safety and turn off my car engine because the engine is overheating. I was on the highway when this occurred. The engine coolant light was well into the red zone. I had my two kids in the car and my service animal... The car was say overheating and blinking the engine coolant red wa…
Common questions
How serious is the engine problem on the 2017 mazda CX-9?
It's a documented issue but not catastrophic. 33 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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