2019 Mazda MAZDA3 driver assistance problems

Filed Aug 6, 2025 · Brakes, Driver assistance · OH

To whom it may concern, I was on a back road late in the evening not far from home [XXX] and a small deer ran into the road. I needed to brake to avoid hitting the deer. After breaking, a Brake System Malfunction warning message and i-ACTIVESENSE System Malfunction warning illuminated on my dashboard. I brought the car to a Mazda dealership the next morning. The technician determined that the brake fluid level sensor became stuck, requiring replacement of the brake fluid reservoir and the brake fluid level sensor. What failed: The repairs include replacement of the Brake Fluid Reservoir and the Brake Fluid Level Sensor. This is the link to the dealer report [XXX] . No one other than the dealer has inspected these parts to my knowledge. There was no accident of any kind. I personally felt unsafe after these parts failing and reached out to Mazda Customer Care to request investigation of the issue. The case manager just called me back today to say they could not help me. Mazda has denied warranty coverage, claiming the parts are not covered. However, I really do feel this is a critical safety system component that failed after normal emergency use with no collision or impact. Why I feel this is a safety concern: - The brake warning system became unreliable after a single emergency stop. - My car only has 42k miles and is in excellent condition and is fully dealer serviced. - A driver could lose the ability to receive proper brake system warnings if this failure occurs again. - A critical brake sensor should not fail under normal driving conditions, and its failure could lead to delayed driver response in an actual brake fluid loss scenario. It makes me worry for the future. For your consideration: I believe this represents a safety-related defect that should be investigated, as it affects the reliability of the brake system warning indicators in the 2019 Mazda 3. I appreciate your time and consideration. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 18, 2022 · Driver assistance · 15,000 miles · PA

The contact owns a 2019 Mazda Mazda3. The contact stated while driving 35 MPH, the brake warning light illuminated and the vehicle would brake suddenly without the driver depressing the brake pedal. The failure had become recurring. The contact had taken the vehicle to a local dealer where it was diagnosed and determined that the failure could not be duplicated. The vehicle had not been repaired. The contact researched online and related the failure to the federal safety agency Campaign Number: 19V907000 (Forward Collision Avoidance). The manufacturer had been informed of the failure. The failure mileage was approximately 15,000.

Filed Apr 20, 2022 · Driver assistance, Electrical · TX

the vehicle started surging at low soeeds and accelarating and control module issues for the transmission

Filed Jun 22, 2021 · Driver assistance · AZ

was driving in a car park and it randomly braked thinking someone was infront of me but there was nothing and the car behind me almost rear ended. Already fixed the recall last year according to Mazda. This is extremely scary and not sure what would have happened if this was on a highway

Filed Apr 28, 2021 · Driver assistance · PA

Mazda dealer is refusing to update software per sspc5 to correct a safety issue relating to the mrcc (mazda radar cruise control) unless I first agree to having mazda connected services installed on my 2019 mazda 3 sedan (csp06). When I purchased my new car mazda connected services was not included in my car. I am now being coerced into having mazda connected services installed into my vehicle before they will correct a safety issue regarding a known issue with the adaptive cruise control. My vehicle is still under warranty but unless I agree to having their telemetrics control unit (tcu) installed, they refuse to install the software to correct the dangerous adaptive cruise concern per sspc5.

Filed Dec 21, 2020 · Brakes, Driver assistance · 8,400 miles · CT

I was accelerating after a traffic light turned green and there were no cars in front of me when the car started braking automatically and came to a full stop. Luckily the car behind me was able to stop in time but there was no warning and no reason. I could have been rear ended. I pulled over and checked the two sensors and neither one was blocked (it had snowed here recently). I'm honestly scared this could happen again and mazda is saying there are no open recalls about this for my car and that the car is fine.

Filed Dec 11, 2020 · Brakes, Driver assistance · 120,000 miles · SC

Without cause: the vehicle will suddenly detect the presence of another vehicle and/or sense an imminent collision and subsequently applies the automatic braking system, causing the vehicle speed to suddenly decrease. This has happened repeatedly over the course of driving the car and resulted in being almost rear ended numerous times. This is a very dangerous scenario and could easily cause a severe accident, especially on the freeway when everyone around is going really fast and needs more time to react to the sudden and sharp slowing down of my vehicle. This happens in various locations, freeway, highway, or in the city. I have taken the car to the dealership numerous times to have this fixed, but get a different answer every time I take it in. But the problem remains unresolved and continues to place me, my passengers, other drivers, and even pedestrians in harms way.

Filed Aug 4, 2020 · Driver assistance, Electrical · 1,491 miles · WI

Tl* the contact owns a 2019 mazda mazda3. The contact stated that the brake auto alarm activated causing the brakes to engage. The contact stated the vehicle was included in 19v907000 (forward collision avoidance) for which the remedy was completed. The contact stated the failure persisted. The contact stated that the vehicle network malfunction warning light, vehicle inspection needed, safety and driver support system disabled and front radar obscured warning lights were illuminated. Additionally, the lane departure alarm activated, and the auto correct activated causing the vehicle to pull both to the left and right. The contact took the vehicle to the dealer (russ darrow metro mazda - address: 11330 w metro auto mall drive, milwaukee, wi 53224 phone: (414) 409-9201) who performed the recall remedy along with 8 other unspecified recall repairs however, the failures persisted. The manufacturer was made aware of the failures and a case was filed. The approximate failure mileage was 1,491.

Filed May 24, 2020 · Brakes, Driver assistance · 9,500 miles · PA · crash

These issues been happening since the second month I owned my 2019 mazda 3 hatchback. 1- suspensions, they're very rough & harsh., they bounce so much for no reason, I damaged one tire already while I was driving on i476 normal highway where I stepped on normal pothole ended up damaging my tire, suspensions are really dangers on all roads. 2- "adaptive cruise control" this feature many times almost caused an accident, rear end specially on highways. For some reason it doesn't detect the car in front of me when I have auto cruise enabled, no rain clear weather, this been reported more than 5 times to the dealership & its hard for them to tell what happen. They even had specialist came from ca to check up the car however it was declared the car has no issues, yet I still have issues every day, s 3- emergency breaking, sometimes it enables for no reason & the cars behind me almost rear ended me, they think I did break check but I don't the brakes! 4- peruzzi mazda, where I purchased my car, said they will never work on my car again because "it wasted enough of their time". I have video of me picking up the car from peruzzi mazda, dealership & it won't start up out side the service department & I called the manager & he said leave for next day, he called me day after saying it was my iphone charger... I asked him how the tech was able to bring it outside to the front door without no issues? He refused to answer. I work at a hospital & I daily my car to work, its not safe for me or to anyone on the road to drive it at all.

Filed Dec 2, 2019 · Driver assistance, Visibility · 4,655 miles · CA

I was driving about 30 MPH or slower in a light rain on a city street when my vehicle said that the front radar failed/unable to function, all safety systems are now disabled. This lasted for about 3-4 minutes and then it started to function again but only for 2 minutes and then it gave the same message and disabled all my safety systems while again. It started to function again as I pulled into my driveway which is why I was unable to get a photo. I have had multiple ongoing problems with lane departure warning and with the windshield wiper sensor and the doors and trunk locking and unlocking. I think the entire electrical system is defective and most of the problems come from the front radar but there are so many problems with the electronics that I this this vehicle is a lemon. The lane-keep assist is so bad it has almost made me crash on 3 separate occasions so I have disabled it.