2024 MAZDA CX-90 Power Train Problems

I am reporting an unresolved safety-related defect with my Mazda CX-90. The vehicle began experiencing repeated malfunctions affecting reliable operation while being driven. The issue was reported to the dealer while the vehicle was still under the manufacturer’s original warranty. The vehicle was taken to a Mazda dealership for diagnosis and repair. The problem has not been resolved, and the vehicle has been held at the dealer for over 30 days. I was provided a manufacturer loaner vehicle because my vehicle has not been deemed reliable to return to service. Mazda North America has escalated the issue and informed the dealer that they are “waiting on Japan” for engineering guidance, indicating there is currently no approved repair or resolution. As of now, no permanent fix has been identified. This defect raises safety concerns because the vehicle’s reliability cannot be assured, and returning the vehicle to service without a confirmed repair could put occupants and others at risk. The extended out-of-service time and lack of an approved repair suggest a potential systemic issue. The vehicle remains available for inspection and is currently in the possession of the Mazda dealer. -

My new Mazda CX-90 failed to restart after being stopped at a stop sign. After restarting manually, the dash displayed the check engine light and the “i-stop malfunction” light. The car now flashes this warning whenever it is on. There is an open recall for this issue (24V-816) but my local Mazda dealer does not pull anything up when they search my VIN. It appears the recall only applies to these vehicles built between 12/23 and 4/24. My car was built in 11/23. I believe this recall should be expanded to included more vehicles like mine.

My Mazda CX90 consistently has a hard delay before jerking my car forward, especially when shifting between 2nd and 3rd gear. This is most common at slow speeds and accelerating from a stop. On top of generally rough shifting, there have been four separate instances where my car blatantly stopped accelerating and slowed my car from 70-80 mph down to 40-45 mph. Once driving up a hill, and the rest on a flat interstate. I tried flooring the gas each time and the rpms would go up to approx 6000, but the car simply would not respond. After multiple attempts to let off of the gas and re-engage the vehicle, my car suddenly began accelerating again and continued as if nothing happened. I have been able to safely move out of traffic's way each time, but this presents a great threat to myself and others as I have no control over my speed and can easily get into a collision. As if uncontrollable stopping on the freeway isn't enough, my vehicle also accelerates on its own and jolts itself forward when driving at slow speeds through parking lots and stand-still traffic. These accelerations have occurred at idle with the breaks both on and off. The vehicle only propels itself forward by a couple of feet, but the issue seems to be getting more severe each time it occurs. Luckily I have been able to control the car and stop myself from hitting others so far, but I am afraid this may cause harm to pedestrians or people in nearby vehicles. I have mentioned these issues to my local Mazda dealership on multiple occasions, but they dismissed my concerns each time and told me my vehicle is in safe operating conditions. They claim they have not been able to replicate any accelerating/ decelerating instances, and they say the car's shifting is within spec. My car has never thrown any codes or displayed warning lights on the dash. I have taken the vehicle in for all recalls and maintained it well. I recently hit 15000 miles, though these issues have been presenting since 5000.

I’ve been experiencing power loss and surges/RPMs drop for nearly a month now while driving at various speeds. Each time, the iStop indicator comes on. This is a serious safety concern. I am extremely worried that the vehicle could stall, especially while my family is in the car, while driving on a busy highway. Undoubtedly, this issue presents a significant risk to the safety of drivers and passengers. I am requesting your assistance in initiating an official recall from the manufacturer for this component failure. Based on my research, I am not the only one experiencing this grave issue. Many others have reported similar problems on forums like Reddit, which is proof that this is a widespread issue.

The contact owns a 2024 Mazda CX-90. The contact received notification of NHTSA Campaign Number: 24V815000 (Power Train, Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact stated while driving at approximately 5 MPH, the vehicle stalled and shuddered abnormally. The message to "Please Pull Over to a Safe Place" was displayed on the instrument panel. The vehicle was towed to a dealer where it was diagnosed and determined that an unknown part needed to be replaced. The vehicle was not repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The failure mileage was approximately 16,000. Parts distribution disconnect.

Mileage: 16,000

On multiple occasions the vehicle has falsely detected collisions and suddenly braked while on highway leading to serious safety issues. On other occasions, while changing the lanes with blinkers on, the vehicle suddenly steered back into the original lane and triggered a collision warning even though there was no vehicle/obstacle nearby. This created a serious risk of collision. Even at slow speeds, the vehicle inaccurately triggers a collision warning creating unsafe driving conditions. This frequently happens when we are driving the vehicle in the parking garage, even in absence of moving vehicles nearby. The mild hybrid power train system had issue leading to hybrid system malfunction and iSTOP malfunction. This finally led to hybrid battery failure and the vehicle remaining out of service for over a month. Apple Carplay disconnects erratically creating hazardous condition especially when we are using Carplay for navigation. Such a disconnection requires the driver to suddenly reach over to the phone and input driving directions in the phone again. This is especially dangerous in city driving conditions needing frequent turns.

The vehicle displayed "Engine Malfunction have your vehicle inspected" on the dash along with orange lights. The vehicle would drive but without warning would not come up to speed. This caused an unsafe situation entering the interstate where the vehicle was below the minimum speed until we could exit the highway. There was no warning of the low power and inability to operate normally. This was a known problem and the vehicle had all of the recalls already performed. Dealer states there is a problem with the low pressure fuel pump. I am not confident the problem will be solved.

When the gear shift is bumped it can go from Drive to Neutral by accident and without the driver's knowledge. I would assume this button needs to be depressed to change gears but on this car it will go from Drive to Neutral without depressing this side button.

Dear NHTSA, I am writing to formally raise a safety concern regarding my Mazda CX-90 Turbo S Premium Plus, which I purchased and currently have approximately 25,078 miles on. This vehicle is equipped with a mild hybrid 48V battery, which is not a full high-voltage battery. The vehicle has been at the dealer since December 9th for ongoing issues. On [XXX], I began experiencing multiple malfunctions, including the Mild Hybrid System Malfunction, Engine Malfunction, and iStop Malfunction (with the iStop malfunction indicator blinking). This is a serious safety concern. I was extremely worried that the vehicle could stall, especially while driving on a busy highway at high speeds. Both myself and my family felt fearful while driving the car. I believe this issue presents a significant risk to the safety of drivers and passengers. I am requesting your assistance in initiating an official recall from the manufacturer for this component failure. Based on my research, I am not the only one experiencing these issues—many others have reported similar problems on forums like Reddit, which suggests that this could be a widespread issue. Additionally, Mazda offers a 6-year/60,000-mile warranty on this hybrid battery. If the component fails after this period, the cost to replace it could reach $6,000, with the customer being responsible for a large portion of the expense. This is concerning, especially considering that if this part fails after 30,000 miles, the customer may be expected to bear up to 70% of the cost. It is frustrating to see such issues with a vehicle sold in the U.S., and I feel that companies should be held accountable for offering subpar products. For comparison, BMW offers a 100,000-mile warranty on similar components. I hope you will take immediate action to address this issue and help ensure that affected vehicles are recalled for repair or replacement. Thank you in advance for your attention to this matter. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving (less than 2000 miles on the OD) in our 2024 cx90 SE the vehicle started to shift out of timing and everything shut off at once. The vehicle lost all power and all parts shut down. The vehicle would start back up and power steering went out. Our driving speed was at 30mph so it was extremely scary during rush hour traffic. We had to have it towed to the dealership, we're not sure what the issue will be.

Stopped at a red light on a busy 2-lane road. I-stop function turned the engine off. When the light turned green, releasing the brake caused a "Hybrid Battery Malfunction" error and the engine failed to start. We put the transmission in park and attempted to turn off and turn on the car with the push to start button. When we attempted to start the car with the push to start button, the car would not start. We were unable to shift into neutral to move the car out of the busy 2-lane highway and were blocking traffic for about an hour. The first tow truck to arrive was unable to move the car onto the flat-bed because the transmission was stuck in park and would not go into neutral so another tow truck was dispatched with a dolly. Our safety was at risk because we were stuck in an immobile car in busy highway traffic. A police officer arrived to help direct traffic around our disabled car. The vehicle is currently at the dealership and has not been inspected as of the time of this report.

The vehicle's parking "gear" would not engage. Further, the emergency brake would not engage. Puts all in proximity to the vehicle at risk due to the vehicle rolling into or onto them and damaging personal property. Dealership service department could not recreate the the parking "gear" issue, but were able to recreate the emergency brake not engaging. Vehicle has been inspected by Macdonald Mazda West representatives.

Turning left at intersection at green light , the oncoming traffic sped up and I needed to floor it to not get hit. The my car switch to hybrid and went into a crawl pace. I had to floor it again to wake it up and get the heck out of the way. I don't think the computer is doing a good job talking to the hybrid system and the powertrain during emergency maneuvering. This can be dangerous. I know it scared the hell out me.

On 12/5/2023, upon turn after intersection, loss of power to the engine. Pushing gas provided no response from the engine. Engine power cut to about 10 miles an hour. Felt as the car was driving on battery - as no engine was heard. Was able to pull over to the side. Turned off and on engine 2-3 times but the power wasn't restored. Received warning on dashboard that there is malfunction with engine. Also received errors on Mazda application I had on phone. Engine light was on the dashboard. Photos attached. While obtaining assistance for tow service I was accidentally disconnected. I tried turning the car on again, and engine turned on normally. Total time between last unsuccessful turning on/off engine was about 10-15 minutes. First time experience such issue with loss of power and engine cutting off/ not working. Informed the car dealership and car repair/ check was scheduled to be brought to dealership for 12/8/2023. Estimated repairs taking 4 to 5 days before I can get the car back. Distance to dealership about 150 miles. Confidence in this car severely shaken - considering the price and the fact it is brand new.

I use car washes that require you to put the car in neutral and the car wash has a device that pulls the car through. Upon exit, you are supposed to put the car into drive and drive away. But unfortunately the car will not go into drive. An error message pops up that tells me I can’t go into drive. I then have to quickly hit the brake, put the car in park, and then into drive so I can pull away. This is dangerous if there is a car behind you in the car wash because you have almost no time to react. This has happened at least 5 times, and next time I’ll have the camera ready to capture the message that comes up. It seems as though the car only allows you to move forward in neutral for a certain amount of time or distance before it has the error.