2021 Mazda CX-9 engine problems
20 owner complaints filed with NHTSA name the engine on the 2021 Mazda CX-9 — 51% of all complaints for this model year.
What owners report
“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…”
filed Aug 10, 2026
“1) What component or system failed or malfunctioned: On 6/12/2026 While drive on the highway with our daughter in the car and we experienced a high speed stall. The engine failed and we lost power. We barely got the car of the highway and coasted into a parking lot. 2) Life threating for Father…”
filed Jul 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA-017/25 12/16/25, 09/08/25, 07/14/25, 05/15/25 and 03/21/25 DESCRIPTION Mazda Connect Frequently Asked Questions…
SA-042-26 · Service Bulletin/Repair Instructions · issued Jul 1, 2026This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s)…
SA-041-26 · Service Bulletin/Repair Instructions · issued Jun 19, 2026
Engine problems in other CX-9 years
| Year | Reports | Share |
|---|---|---|
| 2019 CX-9 | 23 | 43% |
| 2018 CX-9 | 76 | 59% |
| 2017 CX-9 | 43 | 70% |
| 2016 CX-9 | 65 | 63% |
| 2015 CX-9 | 17 | 49% |
| 2014 CX-9 | 19 | 35% |
| 2013 CX-9 | 17 | 25% |
| 2012 CX-9 | 25 | 11% |
| 2011 CX-9 | 15 | 9% |
| 2010 CX-9 | 23 | 12% |
| 2009 CX-9 | 4 | 7% |
| 2008 CX-9 | 6 | 3% |
Other reported problem areas on the 2021 Mazda CX-9
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.