2024 Mazda CX-90 PLUG-IN Hybrid

On [XXX], I was driving on [XXX] near Pasadena at normal speed of traffic when suddenly an error message “Hybrid System Malfunction” appeared on the dash board along with check engine light, and the car began to stall slowing down to nearly full stop almost immediately. When I pressed gas pedal, it would not accelerate. Because I was in the far right lane, I had just about enough time to pull over onto the shoulder before the car stopped completely. The car was in EV mode (using all electric power) when this incident occurred with 20 miles of electric range still left. I was lucky that no cars were right behind me as the traffic was moving about 60 mph or my car could have been rear-ended when it came to such an abrupt stop. I put the car in park and turned off the engine, then turned it back on after a couple of minutes. The dashboard was flashing “Hybrid System Malfunction” and “check engine” light was on but I was able to drive it because it had switched to gas power mode. I immediately drove the car to New Century Mazda in Alhambra where I purchased it on [XXX]. The Mazda app on my phone captured two Vehicle Issues Detected at the same time: Hybrid System Malfunction: There is a possibility of restricted power output” and “i-ACTIVSENSE malfunction.” The Hybrid System Malfunction was the most serious and frightening of a series of malfunctions that my car experienced since it was purchased two months ago. On [XXX] (4 days after purchase) the car displayed “Approaching Vehicle Audible System (AVIS) Malfunction,” on [XXX], a “Brake!”light came on when we started the car after it had been parked, which disabled the steering wheel and the gear shift preventing us from driving (problem resolved by turning the car on and off several times). On [XXX], another vehicle issue was detected: “Air bag system and seatbelt pre-tensioner system malfunction.” Car was fully inspected by Mazda dealer in mid-January. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving CX90 PHEV vehicle, a "HAZARD" error displayed on the dashboard and the vehicle stopped driving/accelerating completely. Displayed error reported a Hybrid System Malfunction and instructed driver to switch from hybrid to normal setting. Vehicle would not accelerate despite switch to normal setting and power remaining. Driver powered off vehicle and error remained on display. Driver again powered off vehicle after short wait and error was no longer displayed. Vehicle could then be driven in normal setting. Dealership and manufacturer have been notified with a request for immediate assistance. Vehicle is new and has only been driven for approx. 6 months. No advance warning signs appeared. Internet search reflects a Mazda owners' forum page [XXX] suggests that error has been known for several months with no resolution or recall. A vehicle that shuts down while driving in traffic is a hazard to us all. Responses are requested from both Mazda and NHTSA. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

CX90 PHEV Premium Plus new purchase 12/2023. 1/24/2024: "Hybrid System Malfunction, Have the vehicle Inspected " On a busy freeway with big rigs and other cars during rush hour traffic (5:25pm), going about 70 MPH. Only 1700miles on car so far. 50-60 degrees Fahrenheit outside. 2mi left on charge, full tank of gas. Car completely unable to accelerate all of the sudden on busy highway once this light came on. Was able to pull off to shoulder, albeit challenging as unable to accelerate and navigate through fast cars in right 2 lanes. Was able to restart car, and go at limp speed but unable to get fast enough to merge back. Called tow truck. Car towed to Mazda dealership. Then unable to get off flatbed of the tow truck as would not go into reverse. Tow guy called me and the staff at Mazda called their Service Manager, had to reset that code. (Something glitch kicked in and locked the car from being able to shift gears). Mazda Service was responsive, worked on and got diagnostics the next day. Stated that it was a computer system glitch. So they restarted the whole system. light is gone and car drives during their testing. They can't explain it. So computer and electronic glitch and system misread leads to a MECHANICAL malfunction that stops the car to be able to be accelerated on freeway. I am a mom of 3 young kids, and lucky I am alive.

What component or system failed or malfunctioned, and is it available for inspection upon request? "Hybrid System Malfunction. Stop Vehicle in a Safe Location." Car completely inoperable. Had to tow to dealership as would not start or go out of park. Hybrid and High Voltage battery issues reported by multiple owners. This happened less than a month into owning the vehicle and with less than 1200 miles. How was your safety or the safety of others put at risk? Car deceleration on highway specific to this error reported by multiple owners. Has the problem been reproduced or confirmed by a dealer or independent service center? Uknown. Currently being serviced by dealer. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Currently being inspected by the Mazda dealership I leased the vehicle through. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? "Yes, just a week into having the vehicle (at 300 miles) a "Hybrid System Malfunction" error message appeared to "Have the Vehicle Inspected." Dealership had it in their Service shop for over 2.5 weeks and said nothing was wrong with it.

The car has an "Engine Malfunction" emergency light that goes on. I brought the car into the dealer right away - the car had $1k miles and is brand new, so it's quite scary to get this message. They cleared the error and told me not to worry about it, but were unable to provide a solution. It recurred immediately (within 1-2 days). I reached out to the service department and they told me to ignore it (that there is no fix in progress). My car is unable to change the Mi Drive mode (so it can only stay in Hybrid mode). This is unsafe and goes against the intended use of the car. For example, on a very cold day like today, I wish to warm the car in sport mode (aka not hybrid or electric) and I was unable to change the mode.

Vehicle engine suddenly loses significant power, the car violently shakes and the engine starts knocking. When attempting to bring the car to a safe location, the vehicles brakes wouldn’t work. Then the car displayed a bunch of errors, like “Engine Malfunction” and “Hybrid System Malfunction”. The car has been in service twice for this issue and they haven’t found a fix. This malfunction has happened twice during our commute with our children in the car.

Driving to work the dash lit up with warming signs stating electrical leak detected, Malfunction to hybrid system stop car immediately and contact dealership. Once stopped the car locked up. It would not start would not engage in to gear. There is no neutral gear bypass. We were stranded. Called Mazda roadside assistance and it took 9 hours for a tow truck to arrive. Tow truck had to drag the car up onto flatbed since there was no way to put it into gear. We we're in the city limits not out in the middle of nowhere. The car is currently at the dealership awaiting parts.

I was driving on the freeway on the fast lane and the vehicle slowed from 65mph to zero in about 30 seconds and came to a complete stop. It happened so fast I couldn’t change lanes to get to a safe spot. I was left stranded on the fast lane of the freeway with traffic coming right at me. Vehicle displayed a Hybrid system malfunction message.

Vehicle was parked in garage overnight in our house. At approximately 630AM, carbon monoxide detector alarmed indicating high CO levels inside the house. Source likely appeared to the vehicle- distinct odor of burned electrical wiring/insulation; vehicle felt warm to the touch. Vehicle was dead and would not start. Mazda app indicated critical warnings for ACTIVESENSE, hydrid battery, hydrid system malfunction, high voltage battery depletion, and charging system malfunction starting abruptly at 0210 hours and terminating at 0340 hours. Vehicle had simply been parked in garage and was not plugged in or charging. Last use of vehicle~930PM the night prior. There have been no prior warnings or indications of problems , vehicle has~1k mileage. Vehicle was purchased 7/5/23 and event occurred 7/30/23. Vehicle was towed and is in dealership currently. Mazada USA has been notified by us. Main concerns: 1. Spontaneous carbon monoxide emission of a brand new hybrid EV vehicle model that was parked in a residential home; not plugged in or charging. House full of adults and children overnight. 2. Possible electrical issue with EV/hybrid system leading to spontaneous incomplete combustion of some electrical/battery component.