2021 Mazda CX-9 problems and complaints
Owners have filed 41 complaints with NHTSA about the 2021 Mazda CX-9. The most-reported areas: Engine (21), Unknown Or Other (6), Power Train (5).
Key takeaways
- 41 owner complaints on file with NHTSA.
- 7 involve a crash, 0 a fire, 1 reported injury.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Engine | 21 | 51% |
| Unknown Or Other | 6 | 15% |
| Power Train | 5 | 12% |
| Forward Collision Avoidance | 4 | 10% |
| Service Brakes | 4 | 10% |
| Vehicle Speed Control | 3 | 7% |
| Electrical System | 2 | 5% |
| Back Over Prevention | 2 | 5% |
| Air Bags | 2 | 5% |
| Engine And Engine Cooling | 1 | 2% |
| Tires | 1 | 2% |
| Suspension | 1 | 2% |
One complaint can name several components, so shares add up to more than 100%.
Parts for the 2021 Mazda CX-9
GarageDex's verified specs for this car. Each Buy button searches Amazon for that exact part.
- Battery
- Engine oil
- Engine air filter
- Cabin air filter
- Wiper blades
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| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2021 Mazda CX-9 SUV AWD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2021 Mazda CX-9 SUV FWD | 5/5 | 4/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Engine And Engine Cooling - filed 2026-11-04
The contact owns a 2021 Mazda CX-9. The contact stated that while driving approximately 20 - 25 MPH, the check engine warning light illuminated. The contact used a diagnostic scanner and retrieved DTC: P0303, for a cylinder #3 misfire. The vehicle was taken to a local Mazda dealer to be diagnosed and repaired. The deal...
Power Train,electrical System,engine - filed 2026-10-14
2021 Mazda CX-9 (VIN: JM3TCBDY3M0538768 / 72,400 mi) Vehicle has suffered complete, sudden loss of motive power at high freeway speeds on four separate occasions. Without warning, the engine loses all propulsion, essentially stalling mid-traffic and forcing me to dangerously coast across active freeway lanes to the sho...
Power Train,vehicle Speed Control,forward Collision Avoidance - filed 2026-09-12
I entered the interstate normally, with no issues accelerating or merging. While driving at approximately 70 mph, in traffic, all three warning messages appeared on the instrument cluster at the same time: “Smart Brake System Malfunction,” “Driver Attention Alert System Malfunction,” and “Forward Smart City Brake Suppo...
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More for the 2021 Mazda CX-9
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.