2020 Mazda CX-9 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
19 owner complaints analyzed
1 distinct recall campaigns
14,000 mi median reported failure mileage
Scope: 2020 model year. Data snapshot: . 3 complaints include usable failure mileage.
Most common problems
Engine is the most frequently named component, appearing in 5 of 19 complaints (26.3%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 4 | 21.1% |
| Fuel system concerns | 3 | 15.8% |
| Transmission and shifting | 2 | 10.5% |
| Engine operation | 1 | 5.3% |
| Electrical and battery issues | 1 | 5.3% |
| Steering behavior | 1 | 5.3% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Engine | 5 |
| Electrical System | 4 |
| Fuel/Propulsion System | 3 |
| Unknown Or Other | 3 |
| Forward Collision Avoidance: Automatic Emergency Braking | 2 |
| Power Train | 2 |
| Service Brakes | 2 |
| Air Bags | 1 |
Engine: 5; Electrical System: 4; Fuel/Propulsion System: 3; Unknown Or Other: 3; Forward Collision Avoidance: Automatic Emergency Braking: 2; Power Train: 2; Service Brakes: 2; Air Bags: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 2 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 1 |
| 150,000 and above | 0 |
Under 25,000: 2; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 1; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (2). 16 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2020 | 1 |
| 2021 | 3 |
| 2022 | 2 |
| 2023 | 2 |
| 2025 | 5 |
| 2026 | 6 |
2020: 1; 2021: 3; 2022: 2; 2023: 2; 2025: 5; 2026: 6
Pattern summary
Engine leads the component reports. Braking behavior appears in 4 complaint narratives. Fuel system concerns appears in 3 complaint narratives. Transmission and shifting appears in 2 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11307114 · 2020-02-04 (February 4, 2020)
THE MAZDA CX-9 UNCOMMANDED ENGINE ACCELERATION REPORTED HEREIN DID NOT RESULT IN ANY DAMAGE PRIMARILY BECAUSE IT COMMENCED SEVERAL SECONDS AFTER I BEGAN LIGHT BRAKING WHILE APPROACHING A RED TRAFFIC LIGHT. MY IMMEDIATE RESPONSE WAS TO INCREASE BRAKE PRESSURE; THERE WAS NO NEED FOR ME TO MOVE MY LEG OTHER THAN PRESSING HARDER WITH MY FOOT. MY FOOT HAD BEEN OFF THE ACCELERATOR FOR MANY SECONDS WHILE ALLOWING THE CAR TO SLOWLY DECELERATE WHILE COASTING TOWARD TRAFFIC STOPPED AT A RED LIGHT. WITHIN TWO SECONDS OF COMMENCEMENT OF UNCOMMANDED ENGIN…
Owner-reported narrative. 2,200 miles reported. Look up ODI 11307114 at NHTSA ↗
Owner report 11433381 · 2021-09-17 (September 17, 2021)
On 10/12/2021 we were driving on and urban street when the vehicle infront of us signaled and initiated a right hand turn. At that point were we traveling approximately 20 mph, and we were driving with active cruise disengaged. When we were around 150 feet behind the vehicle taking a right when our CX-9 falsely engaged the emergency braking. Our car with our whole family in it locked up the brakes and stopped in 80 feet short of the car taking a right. The vehicle behind us only managed to stop 10 feet short of hitting us in the rear. It is in …
Owner-reported narrative. Look up ODI 11433381 at NHTSA ↗
Owner report 11665964 · 2025-06-10 (June 10, 2025)
The vehicle will hesitate/stall while driving down the road. The vehicle has done this multiple times and has actually shut off on 2 different occasions while at a stop. on 2 occasions now the vehicle has not wanted to start. I have taken vehicle to Mazda dealership and they can never duplicate it. When they check for any codes, the vehicle computer does not give accurate times when happened. This last date I took it to them 6/9/25, the computer said it happened 4000 miles ago. The time before, I took it in the morning it happened, 5 min after …
Owner-reported narrative. Look up ODI 11665964 at NHTSA ↗
Owner report 11741400 · 2026-06-01 (June 1, 2026)
Prior to [XXX] The vehicle ran rough and sputter excessively. I took car to local repair shop. Diagnostic equipment determined the fuel injector needed to be replaced. Vehicle ran better but continued to sputter and ride rough on occasion. Prior to [XXX], the vehicle stopped operating properly. The vehicle would not travel faster than 20 mph and sometimes would stop completely in the middle of the road. This was a hazardous situation. The vehicle seemed to be starved for fuel. All warning lights were displayed on the short trip home. Being too …
Owner-reported narrative. Look up ODI 11741400 at NHTSA ↗
Owner report 11428575 · 2021-08-10 (August 10, 2021)
The 2020 Mazda completely shut off following an exit from an expressway, turn under a bridge and slow down for a red light. The Mazda electrically shut off and coasted to a braked stop in the center lane of a 3 lane road. The entire electrical system went dead, no exterior lights, signals, instrument panel or radio. There was no warning, everything electrical just shut off. In a moving traffic situation the car could not maneuver or restart without being placed in PARK. (There is a history of Mazda CX 9's having a similar problem which sent t…
Owner-reported narrative. Look up ODI 11428575 at NHTSA ↗
Owner report 11724926 · 2026-03-17 (March 17, 2026)
Warning signal front camera sensor system malfunction Forward Smart City Brake Support malfunction When this initial happen the steering wheel becomes hard to maneuver than releases The front and back cameras are clear from any debris or obstructions What should I do next?
Owner-reported narrative. Look up ODI 11724926 at NHTSA ↗