Notes: The only area of real concern for 2010 Mazda CX-9 owners is the brake booster.

In 2014, Mazda extended the warranty on the 2007-2013 CX-9 brake booster to 7 years / 90,000 miles. However this extended warranty has expired, so buyer beware.

This Mazda CX-9 brake booster failure isn't terrible in terms of repair cost — it "only" costs $550 average to fix. However it is a safety issue when the brake booster fails as it increases stopping distance. Owners have reported having to stomp on the brake pedal, & crashes/injuries have been reported due to this CX-9 brake booster defect.


really awful
Typical Repair Cost:
Average Mileage:
100,450 miles
Total Complaints:
5 complaints

Most Common Solutions:

  1. replace engine (4 reports)
  2. not sure (1 reports)
2010 Mazda CX-9 engine problems

engine problem

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2010 Mazda CX-9 Owner Comments

problem #5

Jul 062021

CX-9 GT 3.7L

  • Automatic transmission
  • 105,023 miles


Same complaint as others. Engine light comes on and suddenly I'm being told to drop 10K to replace an engine on a 10 year old car with only 105K miles on it? POS!

- Pj B., Northbrook, IL, US

problem #4

May 202019

CX-9 Touring

  • Automatic transmission
  • 116,000 miles

May join class action lawsuit. I encourage folks to research this known problem.

- Kim M., Lancaster, PA, US

problem #3

May 152019

CX-9 LX 3.7L

  • Automatic transmission
  • 82,000 miles

We have a 2010 Mazda CX-9 that had an engine failure while driving high speed on a parkway. There was no warning, the check engine light came on and it started overheating. It had just over 80,000 miles on it and we were shocked when we found out that the coolant mixed with oil and got into the engine and killed it. We did not expect to have to replace the engine on a car that is less than 10 years old and has low mileage. What can Mazda do for us to remedy the situation? Nothing. They refused to help, because the car is not under warranty any more.

Looks like an engine design flaw on part of Mazda where the water pump fails and leaks coolant into the engine. This is very dangerous, as it happens while driving. Mazda knows about it and should issue a recall on water pumps.

We serviced the car on schedule and no one could catch the water pump problem, because it is impossible to see it without taking out the engine! Who designs these kinds of engines?! Apparently FORD does.

What a huge expense, headache and safety issue! I will never buy another Mazda or recommend to anyone to buy one. We bought this car brand new, and it is dead less than 10 years later.

- Daiva R., Boulder, CO, US

problem #2

Jul 152018

CX-9 Sport AWD 3.7L V6

  • Automatic transmission
  • 105,000 miles

click to see larger images

engine failure engine failure

Water Pump Failure. No Warning Signs!

While traveling 65MPH on highway with my family the vehicle shut down, engine light appeared and we nearly were struck by another vehicle when pulling over. CX-9 was towed 75 miles to mechanic who informed us coolant entered the engine from failed water pump and engine needs replacement ($4000). Mazda service manager confirmed this is not uncommon and confirmed engine will need to be replaced.

When researching CX-9 water pump failure online I found many disturbing testimonials of other CX-9 owners with similar experiences. There were no warning signs of water pump failure.

Mazda needs to warn affected CX-9 owners ASAP with a TSB or recall the water pump. The water pump is buried inside the engine and cannot be visually inspected. Having a vehicle shut off abruptly when traveling at high speeds is a serious risk for both driver, vehicle occupants and surrounding motorists.

I contacted Mazda and NSTSA. I hope they take my complaint seriously and take action before a serious or fatal injury occurs.

- ttflanagan, Havertown, PA, US

problem #1

Aug 212017

CX-9 Grand Touring

  • Automatic transmission
  • 94,000 miles

Total engine failure due to faulty engine design with water pump in engine compartment. Mazda dealership in Tulsa is charging $8900 to replace engine (assuring me it is a newly designed engine with water pump outside of engine compartment). No compensation being offered at all because it is out of warranty and I wasn't using dealership to service vehicle. I loved this car until this happened.

- Dee Ann B., Tulsa, US

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