2021 Mazda CX-9 problems and complaints
Owners have filed 39 complaints with NHTSA about the 2021 Mazda CX-9. The most-reported areas: Engine (20), Unknown Or Other (6), Power Train (4).
Key takeaways
- 39 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 | 20 | 51% |
| Unknown Or Other | 6 | 15% |
| Power Train | 4 | 10% |
| Forward Collision Avoidance | 4 | 10% |
| Service Brakes | 4 | 10% |
| Vehicle Speed Control | 3 | 8% |
| Back Over Prevention | 2 | 5% |
| Air Bags | 2 | 5% |
| Tires | 1 | 3% |
| Suspension | 1 | 3% |
| Wheels | 1 | 3% |
| Electrical System | 1 | 3% |
One complaint can name several components, so shares add up to more than 100%.
| 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.
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...
Tires - filed 2026-08-27
On a high-speed highway (Route 14), the vehicle suffered a sudden flat tire/air loss event, forcing an emergency pull-off onto a narrow shoulder with 65 mph traffic. Subsequent inspection revealed the failed tire and the rest of the set were manufactured in late 2007 (DOT code 4907). These 19-year-old tires were insta...
Power Train,vehicle Speed Control,engine - filed 2026-08-10
The vehicle was parked stationary in the driveway with the engine running for 3-5 minutes with the A/C on. The vehicle then accelerated forward into my garage causing damage. Once I entered the vehicle, both the dash and shifter displayed park. Current TCU system internal failures have been reported from the pulling of...
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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.