2018 Mazda Cx-9 problems, complaints & recalls
Most-reported problem areas: Engine (61) · Power Train (11) · Service Brakes (8)
🧭 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 (2)
Fuel System, Gasoline:delivery:fuel Pump 2021-11-12 · campaign 21V875000 · 121,038 vehicles
Defect: Mazda North American Operations (Mazda) is recalling certain 2018 Mazda3, Mazda6, 2019 CX-3, 2018-2019 MX-5, CX-5, CX-9, and 2019-2020 Mazda2 vehicles. The impeller inside the low-pressure fuel pump may crack and deform, potentially causing the fuel pump to fail.
Risk: Fuel pump failure may cause an engine stall, increasing the risk of a crash.
Fix: Dealers will replace the fuel pumps, free of charge. Owner notification letters were mailed July 18, 2022. Owners may contact Mazda customer service at 1-800-222-5500 Option 4. Mazda's number for this recall is 5321K.
Electrical System:wiring 2019-05-30 · campaign 19V403000 · 7,854 vehicles
Defect: Mazda North American Operations (Mazda) is recalling certain 2018 CX-9 vehicles. The wiring harness may disrupt electrical communications and disable the passenger frontal air bag, turn signals, and/or engine starting system.
Risk: The passenger frontal air bag may not deploy, increasing the risk of injury. Inoperable turn signals prevent the driver from signaling to other drivers, increasing the risk of crash.
Fix: Mazda will notify owners, and dealers will repair the wiring harnesses, free of charge. The recall began July 26, 2019. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 3419E.
Service bulletins (470)
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.
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
Engine 2026-06-19 · SA-041-26 · Service Bulletin/Repair Instructions
this 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) stored...), interview the customer before proceeding with normal mgss diagnosis by ask
Power Train 2026-05-01 · 01-008-26 · Service Bulletin/Repair Instructions
this bulletin supersedes the previously issued bulletin(s) listed below. the changes are noted in red. 01-008/23 06/05/23 some vehicles may exhibit rattling noises from the engine compartment and oil leakage from the drive belt auto tensioner. this may be caused by insufficient sealing at the driv
Unknown Or Other 2026-04-30 · SA-031-26 · Service Bulletin/Repair Instructions
description some vehicles may require the replacement of a damaged vin plate or vehicle certification label. to obtain a replacement vin plate (bulkhead-mounted and visible through the lower-left area of the windshield), contact dag (dealer assistance group) using vin plate request form available on
Unknown Or Other 2026-04-21 · SA-029-26 · Service Bulletin/Repair Instructions
this service alert supersedes the previously issued sa listed below: the changes are noted in red. sa-011/24 02/12/24, 06/06/24, 07/29/24 description mazda has developed factory recommended scheduled maintenance services that support all major vehicle systems. mazda recommends dealers follow the sch
Engine 2026-04-16 · SA-026-26 · Service Bulletin/Repair Instructions
this service alert supersedes the previously issued m-tip(s) listed below. the changes are noted in red text. mt-002/19 09/30/19 and 12/19/19 description if an engine assembly is replaced after a catastrophic internal mechanical failure, clean the intake manifold internally before installing a repla
Showing the 6 most recent of 470 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-09-17 · Engine · 124,000 mi“while driving at highway speed in heavy rain the oil light suddenly came on followed within 30 seconds by an urgent need to immediately stop the car due to overheating. there was no radiator fluid left due to the sudden and catastrophic structural failure caused by a known manufacturing defect. mazda calls it csp-11. they did not do a recall even t…”
2026-09-15 · Engine“my 2018 mazda cx-9 equipped with the skyactiv-g 2.5t developed a serious cylinder-head/cooling-system failure. the vehicle began to lose coolant with no apparent external leak and subsequently displayed and engine -overheating warning. it continued to lose coolant after a flush. the mazda dealership inspected the vehicle and diagnosed a warped cyli…”
2026-08-08 · Engine“i was driving home from work and may car started overheating out of nowhere. i was stuck in traffic and white smoke was exiting my exhaust. i pulled over and all of my coolant leaked out of my car. took it the shop and they said i had a cracked head and need a whole new engine. i seen that there was a warranty sent out for a problem with an exhaust…”
2026-07-15 · Engine“the cylinder head on this 2018 mazda cx-9 (skyactiv-g 2.5t engine) cracked, allowing engine coolant to leak and intermix with engine oil, causing loss of coolant and catastrophic engine failure. the vehicle became undriveable in the first week of november 2025 at approximately 125,019 miles and has remained inoperable since; it was not in a crash a…”
2026-06-08 · Seats“my passenger heated seats malfunction while i was driving. as i was driving on the highway i smelled something burning. i didn't know where the smell was coming from it was strong . then while i'm driving on the highway my seat started to smoke a lot i got scared and pulled on side of the road. i realized my seat was the issue turned off the heated…”
2026-06-05 · Engine“my wife was driving the vehicle when the emergency lights started going off. she had to pull over because the car wouldn't run and said it was overheated. all the maintenance has been done to the car. we took it to the dealership and they said it is a cracked head and it is a known issue. they even issued a extended warranty for it. it is tsb 01-00…”
2026-04-14 · Power Train“my 2018 mazda cx-9 with the skyactiv-g 2.5t engine has been diagnosed with a cracked cylinder head, cracked exhaust manifold, and cracked turbocharger at approximately 88,000 miles. this is a known design defect documented in mazda tsb 01-002/23 and addressed by customer service program csp11, which extended the powertrain warranty to 10 years/120,…”
2026-03-18 · Electrical System“the liftgate (trunk) opens sporadically. the system keeps trying to open the truck and it's causing a parasitic drain on my battery. i was stranded 2 hours from my home due to this. my trunk would sporadically beep three times, that is the only warning i received. there are safety recalls for other year of mazda cx-9 but not my specific even though…”
2026-03-12 · Service Brakes“my 2018 mazda cx-9 experienced catastrophic engine damage after a radiator failure allowed coolant to enter the engine. the vehicle provided no dashboard warning, overheating alert, or coolant warning before the failure occurred. modern vehicles are designed to alert drivers to overheating or cooling system failures. the lack of warning prevented m…”
2026-02-21 · Seats:mid/Rear Assembly“the adjustable rails holding the rear left seat in place no longer latch. it is available for inspection. this is the most common place for a car seat in this car. in the event of a crash the seat would slide forward. the seat belt attaches to the seat so there would be little restraint on the rear passenger. the mechanic who attempted a repair sta…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.