2021 Mazda Cx-9 problems, complaints & recalls
Most-reported problem areas: Engine (18) · Vehicle Speed Control (2) · Service Brakes (2)
🧭 Reliability snapshot
Compared against other Mazda Cx-9 model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (1)
Seats:mid/Rear Assembly 2021-09-27 · campaign 21V750000 · 8,648 vehicles
Defect: Mazda North American Operations (Mazda) is recalling certain 2020-2021 CX-9 vehicles equipped with 60/40 split bench second-row seats. The left-side second-row seat may unexpectedly slide forward during a crash. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 210, "Seat Belt Assembly Anchorages."
Risk: A seat that slides forward during a crash can transfer excessive force onto a belted occupant, increasing their risk of injury.
Fix: Dealers will replace the internal parts of the affected second-row seats, free of charge. Owner notification letters were mailed November 4, 2021. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 5221I.
Service bulletins (428)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-09-17 · SA-042-26a · Service Bulletin/Repair Instructions
mazda connected services - frequently asked questions (faq) this service alert supersedes the previously issued sas listed below. the changes are noted in red text. sa-042/26 06/30/26 description frequently asked questions (faq) index general questions mazda connect indication setup and getting st
Electrical System 2026-09-11 · SA-041-26a · Service Bulletin/Repair Instructions
description if you encounter any type of electrical concern (e.g, dead battery, engine no start, dtc(s) stored...), interview the customer before proceeding with normal mgss diagnosis by asking if any aftermarket devices have been installed. aftermarket devices may be the cause of the electrical con
Unknown Or Other 2026-09-10 · SA-038-26b · Service Bulletin/Repair Instructions
this service alert supersedes the previously issued service alert listed below. the changes are noted in red text. sa-038/26 08/18/26 and 06/15/26 description some customers may complain about any of the following: 1. infotainment center display does not provide the authorization code (otp) during t
Unknown Or Other 2026-09-04 · SA-038-26a · Service Bulletin/Repair Instructions
this service alert supersedes the previously issued service alert listed below. the changes are noted in red text. sa-038/26 06/15/26 description some customers may complain about any of the following: 1. infotainment center display does not provide the authorization code (otp) during the mymazda a
Unknown Or Other 2026-08-20 · SA-054-26 · Service Bulletin/Repair Instructions
this service alert supersedes the previously issued service alerts listed below: the changes are noted in red. infotainment reboot with navigation card installed this service information is no longer valid. refer to the following updated technical service bulletins: cx-5 / cx-9: 16-002/23 - updated
Unknown Or Other 2026-08-19 · SA-039-26a · Service Bulletin/Repair Instructions
this service alert supersedes the previously issued sa(s) listed below. the changes are noted in red text. sa-039/26 06/15/26 mazda connect symptom troubleshooting description customers having mazda connect concerns should have their vehicle repaired using the following repair procedure.
Showing the 6 most recent of 428 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-10-14 · Power Train“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 shoulder. this creates an extreme…”
2026-09-12 · Vehicle Speed Control“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 support malfunction.” at the same m…”
2026-08-27 · Tires“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 installed by a professional tire sh…”
2026-08-10 · Vehicle Speed Control · 💥 crash“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 data from mazda. …”
2026-07-23 · Engine“ 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, mother and daughter and other drivers on the h…”
2026-07-12 · Engine“this complaint refers to mazda and it's dealer refusal to properly execute the warranty work under the sspd5 valve stem seal class action campaign and does not follow the court's approval of the final settlement agreement. i assert that mazda and it's dealer are not following the sspd5 repair procedures. 1. i have documentation and complaints going…”
2026-06-18 · Engine“check engine light comes on and error p0303 comes on. had an independent mechanic do the following and after each one, error p0303 still came on 1. swap the ignition coils from 2 to 3 2. swap spark plugs from 2 to 3 3. swapped injectors 4. compression test 5. leak down test 6. changed the spark plug, coil and injectors 7. looked for vacuum leaks. …”
2025-12-10 · Back Over Prevention: Sensing System: Camera · 💥 crash“backup camera shows three to four feet before red collision line is not accurate causing severe damage to my garage door.…”
2025-06-05 · Power Train“my vehicle is part of mazda's 2021-2022 mazda valve stem seal settlement. the dealership had yet to call me in for the repair of said valve seal repair as i was on a list. the settlement is suppose to extend out the powertrain warranty on the vehicle 2 years/24,000 to 7 years/84,000. my vehicle has 60,083 miles on it. one of the cylinders on my veh…”
2024-12-23 · Unknown Or Other“ my mazdacx9 engine consumes (burns) an excessive amount of oil, necessitating frequent top-offs between oil changes.this issue started after the first oil change and continued since then.…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.