CarComplaints.com 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.

10.0

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
1 / 0
Average Mileage:
800 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2010 Mazda CX-9 brakes problems

brakes problem

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2010 Mazda CX-9 Owner Comments

problem #2

Oct 202013

CX-9

  • 0 miles

A D V E R T I S E M E N T S

Vehicle was parked. The tailgate was opened manually. I was moving items around in the trunk to make room for new purchases. My husband did not see that I was moving items in the trunk. He approached the drivers side of the vehicle and pressed the power tailgate button inside the vehicle and the tailgate began to close. It made contact with the back of my neck and pushed my face down into the floor board. The sensors did not work. When the tailgate made contact with me it pushed down harder and faster instead of going back up to open. This caused a serious injury to my neck. Specifically cervical 5-7 had to be surgically fused with a titanium plate and screws, and my spinal cord had to be decompressed as the discs had compressed my spinal cord and could have caused complete paralysis from my neck down.

- Miramar, FL, USA

problem #1

Jan 052011

CX-9 6-cyl

  • 1,600 miles
I purchased a new Mazda cx 9 in the fall of 2010. After a few months, I noticed the traction control "tcs off" button illuminated while driving up a paved incline. After turning off the engine and restarting, the tcs-off button shut off. This happened a couple of times before my first servicing. I mentioned the issue to the Mazda dealership when I went in for regular servicing. They checked it and said they found no problem with it. Yet the problem continued sporadically. The tcs-off light occasionally illuminates on inclined roads, in rain or snow, when driving from a paved to an unpaved road (or vice versa). Still the dealership found no problems during servicing. Now in the third year of driving, I mentioned the tcs again to the dealership, and this time they said, oh yes, it is a problem.. Mazda released a bulletin about it, saying the tcs needs to be repaired for $340, and the car shouldn't be driven until it's repaired. Yet this is the condition I've always driven it in! and of course, now my warranty has expired, and I'm liable for repairs even though this problem existed right from the very beginning. The dealership has said they'd put in a call, and perhaps Mazda will cover at least part of the cost. If it had been repaired under warranty, I wouldn't be liable for the repair and I wouldn't have to pay for the rental car while I'm waiting. I'll see how it pans out. Very frustrating.

- Hastings On Hudson, NY, USA

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