really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
20,994 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.

2012 Mazda CX-9 engine problems

engine problem

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2012 Mazda CX-9 Owner Comments

problem #8

Mar 012016


  • 33,000 miles


The contact owns a 2012 Mazda Cx-9. while driving 20 mph, there was a loud metal to metal noise coming from the rear of the vehicle. In addition, the gears failed to shift correctly and the oil and engine indicators illuminated. The dealer diagnosed that the brakes needed to be changed. The brakes were replaced, but the failure recurred and worsened. The contact also smelled fuel coming from the vehicle and the vehicle had trouble accelerating. The manufacturer was notified. The failure mileage was 33,000.

- Stow, OH, USA

problem #7

May 302014


  • 55,000 miles
The contact owns a 2012 Mazda Cx-9. the contact stated that while traveling 15 mph, the vehicle exhibited difficulty in decelerating. The contact had to pump the break pedal extremely hard in order to slow the vehicle. There was a hissing noise that sounded throughout the vehicle. The vehicle did not decelerate until approaching an incline. The contact was able to stop at a local mechanic shop where the mechanic diagnosed the that the brake vacuum booster needed to be replaced. The vehicle was repaired. The failure mileage was 55,000.

- Dripping Springs, TX, USA

problem #6

Apr 012014

CX-9 6-cyl

  • miles
I have an issue with the brake pedal making a hissing sound when depressed, it fills soft and extremely hard, which makes it difficult to stop. If I release the brake pedal the engine revs up and down at least three times making the car hesitate with engine clunking and a feeling like someone hitting you from behind. It happens very sudden and unsafe manner. I had two occasions when a had to press extremely hard on the brake to stop the car. I think that there is a serious mechanical defect with the brake system and should be immediately addressed by Mazda. I had researched on line and there are number of Mazda CX9 owners with similar complain. Please feel free to contact me for further assistance with this matter.. sincerely. [xxx] [xxx] or home [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6)

- Bronx, NY, USA

problem #5

Sep 012013


  • 35,000 miles


The contact owns a 2012 Mazda Cx-9. the contact stated that while driving approximately 45 mph, the vehicle stalled unexpectedly. The vehicle not diagnosed or repaired. The manufacturer was not notified. The failure mileage was 35,000.

- Cordova, TN, USA

problem #4

Jul 172013

CX-9 6-cyl

  • 17,000 miles
I have a Mazda 2012 that spontaneously stalls while decelerating. It also stalls predictably on an incline. Mazda corporation has stated "the stalling on an incline is a characteristic of all Cx-9 models" and are not willing to fix it. They have informed me that stalling while decelerating in my car has not been able to be recreated by their tech so they are doing nothing about it. I have been in two near miss accidents. The car loses power steering and braking and the driver has little to no control when it stalls. Please watch this video of a brand new (loaner from the dealer while they looked at my 2012 Cx-9) 2013 Cx-9 (125 miles on it). This is the "characteristic" I am referring to, please advise future buyers of this very unsafe "characteristic". when it stalls in my driveway, I cannot brake "sharply" or effectively enough to stop the car from drifting into the road. youtu.be/pbzhvieihkc.

- Andover, NJ, USA

problem #3

Jul 112013

CX-9 6-cyl

  • 12,000 miles
Incident -1 traveling about 45 mph decelerating to make a right turn, the car stalls out leaving me with no control of steering and little ability to brake. Incident 2- making right turn (decelerating) car stalls out leaving me with no steering and little braking control. Incident 3- pulled up into driveway on slope. Put the car in reverse to back out, car stalled out leaving me with very little ability to brake.

- Andover, NJ, USA

problem #2

Feb 132013

CX-9 6-cyl

  • 900 miles
The contact owns a 2012 Mazda Cx-9. the contact stated that the vehicle would consume excessive oil without warning. The vehicle was taken to a dealer where the failure was unable to be replicated. The contact stated that the technician mentioned that the consumption of oil was unusual and could cause the engine to fail. The manufacturer was notified of the failure. The vehicle was not repaired. The approximate failure mileage was 900 and the current mileage was 42,000.

- Lexington, KY, USA

problem #1

Jan 212013

CX-9 6-cyl

  • 15,049 miles
I had an incident yesterday resulting in a minor collision. My accelerator stuck, my engine kept revving, and I could not stop. I kept applying the brakes but it felt as if everything locked up. I rearended the person in front of me no damage to their car and only minor to mine. I am now afraid to drive the vehicle. My husband contacted the dealership and they are waiting to hear back from Mazda corporate.

- Dayton, NV, USA

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