2021 Mazda CX-30 Driver assistance Problems

On June 3rd, 2026, about 1:15 PM, I braked in the rain because there was a stopped car in front of me. The brakes did not work; the Automatic Emergency brakes did not work; the Forward Collision Warning did not work and I hit the car in front of me causing a 3 car accident. As I hit the car I saw the Forward Collision Warning come on and then go out. Unfortunately, the brakes worked after that and the Mazda Collision Center cannot find anything wrong with the brakes. I note that the 2022 and 2023 models of the same car did have recalls related to the brakes. The claim is still open and I have not yet received the final damage report. Yesterday I was told the revised estimate is $16,000 and my car and the middle care with front and rear and damage are considered totaled.

NHTSA ID

11743896

Incident

Jun 3, 2026

The I-Activesense camera disables all the time while driving. It disabled cruise control, LKA and LKA warning as well as auto high beams. While driving at highway speeds, when the vehicle drifts slightly over the line it does not get corrected nor do I receive ANY warning. It's almost as if the system knows it's there but doesn't want to turn on. While I was driving one day, it was very windy and the wind blew my car into the other lane slightly and almost collided with a vehicle. If the system was working that would not have happened. The problem was addressed at the dealership and I was told it was "normal". I've watched many videos on this exact model and trim. It is supposed to put my vehicle back into the center of the lane if it drifts over the lines. I will also add that every time this happens, the weather is perfect and nothing is obstructing the camera. The warning lamps that come on are the sensors disabled, auto high beams, forward collision, and cruise control

NHTSA ID

11721948

Incident

May 11, 2025

Two issues A) my usb or display stop to work often I have reset to make it work again, look like loose electrical 2) many time it has also happened start key malfunction error I have jumped start, I have replaced battery same issue

NHTSA ID

11687693

Incident

Sep 15, 2025

The contact owns a 2021 Mazda CX-30. The contact stated that while driving at an undisclosed speed, the accelerator pedal was slightly depressed; however, the vehicle speed increased significantly independently. The contact stated that the failure occurred as the contact arrived at the contact's residence and was attempting to park the vehicle. The contact stated that the brake pedal was depressed; however the vehicle failed to stop, and the vehicle was uncontrollable. The contact stated that the vehicle crashed into the contact’s apartment building. The contact stated that the building siding and steps were damaged due to the failure. The contact was not injured; however the failure had caused serious anxiety issues for the contact. The vehicle was towed to a local tow yard. In addition, the contact stated that the vehicle was towed to the dealer two times prior to the failure because, when attempting to start the vehicle, the vehicle failed to start. The contact was informed that the vehicle's not starting was the result of a faulty battery, and the battery was replaced. In addition, the contact stated that the independent acceleration failure had occurred the day before the crash occurred; however the contact was planning to take the vehicle to the dealer the following day. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 47,000.

NHTSA ID

11680382

Incident

Jul 27, 2025

Mileage

47,000 mi

The contact owned 2021 Mazda CX-30. The contact stated while attempting to park the vehicle in the parking garage at her workplace, the contact reversed and then straightened the steering wheel; however, after shifting to drive and attempting to drive 6-10 feet forward into the parking space, the vehicle unintendedly accelerated and crashed into a pillar before coming to a stop. The contact stated that the engine had revved up, and the vehicle made an abnormally loud sound before the vehicle unintendedly accelerated. The contact stated that the brake pedal was depressed but the vehicle failed to respond, and the vehicle failed to stop as needed. There was no warning light illuminated. The contact stated that the air bags deployed as intended; however, a warning light indicating an air bag malfunction illuminated afterwards. The contact stated that the front driver's side and knee air bags had deployed as designed. The contact sustained pain and bruises on the left side of the chest, on the upper part of the left breast, on the left leg, and on the right wrist and right arm. The vehicle automatically called 9-1-1 for Emergency Assistance, but the contact declined to receive medical assistance. The contact was able to walk away from the scene. No Police report was filed. The contact was unsure whether there was any property damage. The vehicle was towed from the scene and totaled by the Insurance Company. The contact stated that the failure had occurred once before while driving at approximately 60-65 MPH, and the vehicle unintendedly accelerated with an abnormal sound coming from the vehicle, but the contact was able to depress the brake pedal and regained control of the vehicle. The dealer and the manufacturer were not yet notified of the failure. The failure mileage was approximately 31,000.

NHTSA ID

11635826

Incident

Jul 15, 2024

Mileage

31,000 mi

While I was driving on I-90, I lost control of the acceleration of my vehicle. The vehicle was towed and has been diagnosed with a failed transmission! The car would not accelerate or it would accelerate in bursts or rapidly slow down. I was able to pull over and the car failed to move at all after. My safety and others was put at risk as I lost the ability to control the speed of the vehicle on a road where the speed limit is 65mph in traffic around me. When the problem began no lights illuminated, until ~30 seconds in the yellow engine failure light illuminated and then the yellow transmission failure light illuminated. The car was brought to a dealership for inspection and they diagnosed it as a transmission failure. This is unacceptable for such a young vehicle (2021). It should be noted that the car manufacturer immediately approved the replacement the same day it was diagnosed (dealership said it usually takes 48 hours), but the part is back-ordered for months (probably because they know this is happening and trying to cover it up).

NHTSA ID

11609112

Incident

Aug 3, 2024

Car lunged forward when lightly stepping on the gas while making a turn onto a busy street. Then it later lagged in responding when I stepped on the gas. About 5 minutes later, the car dashboard lit up and said there was a transmission error. Mechanic's diagnosis found code P0756 for a shift solenoid B stuck off. The car is unsafe to drive.

NHTSA ID

11597248

Incident

Jun 15, 2024

The accident occurred on the afternoon of Tuesday, November 14, which I reported to Enterprise, City of Falls Church, on the morning of November 15. Additionally, I provided to Enterprise email links to the many reports about breaking problems about the CX30 2021, 2022, and 2023 MAZA models and the reasons for their recall for repair. Here are the details about what happened. As I was trying to put the car in reverse from a standing position, the car, instead, lurched forward at great speed headed toward the Sun Trust bank. I had to use super-human strength to the brake pedal on the car to force it into a standing position. The damage to the car is due to scrapping some bark off one of the trees that separates the Sun Trust Bank property from the CapitalOne bank property where my car was parked.

NHTSA ID

11555773

Incident

Nov 14, 2023

Adaptive cruise control on at 70mph, speeding car pulls into my lane with no gap (completely cut me off), hard brake by computer, I did not tap the brake to take it off of cruise, car that had cut me off zigs into another lane while adaptive cruise control has car at about 40 mph due to hard brake. As car in front pulls out of the lane, adaptive cruise control guns the engine to 3500-4000 rpm since there was no obstruction in front of it anymore and it wanted to go back to the 70 mph preset. During this incident the Engine Malfunction light comes on, warning to get car serviced. Upon taking it in for service they found that the thermostat needed to be replaced? This seems unlikely. Car has only 15k miles on it. I have another model Mazda and the adaptive cruise control has gunned it in a similar manner, taking the car well past 3000 rpm. Mazda needs to reprogram.

NHTSA ID

11543303

Incident

Sep 5, 2023

After setting the adaptive cruise control, and overriding it with the accelerator pedal when approaching a vehicle in front of me to pass it, my vehicle briefly accelerated hard while switching lanes after clearing the vehicle in front of me. This happened even though I had taken my foot off the accelerator already. My current speed was also slightly higher than the set cruise speed. E.g. I set it to 75, I was driving 77 and it jumped up to 80 for a short while before settling back to 75. This acceleration happened right as I cleared the vehicle in front of me and I was in the other lane. You can feel the sudden acceleration. It is as if the radar noticed the vehicle wasn't in front of it any more so it accelerated disregarding the current speed or accelerator position.

NHTSA ID

11525939

Incident

Feb 1, 2023

On March 9, 2023 - car brakes failed at a red light and vehicle collided with an oncoming car coming from the adjacent direction. Vehicle proceeded not to brake for an additional 30 sec minum at which the brakes finally engaged. There was no braking alert - the smart braking system did not engage and there was Forward Collision warning. It is available for inspection upon request. My safety and the safety of oncoming passengers were at risk which could have been fatal Insurance representatives have not yet inspected. Absolutely no warning lots engaged.

NHTSA ID

11516324

Incident

Mar 9, 2023

The contact owned a 2021 Mazda CX-30. The contact stated that her husband was driving 60 mph on cruise control and while approaching a traffic light he depressed the brake pedal but failed to deactivate the cruise control and stop the vehicle. The contact stated no warning light was illuminated. The driver steered to the right and crashed into another vehicle. The contact stated all the air bags did deploy. The driver sustained leisure on his back and both legs due to the air bag deployment. The contact sustained leisure on her head, her nose, her left ribs, hips, and both legs due to the air bag deployment. The contact stated they both sought medical attention at a near hospital. The contact did not know in detail the injuries of the other individuals but did know both individuals sought medical attention. A police report was filed. The vehicle was not drivable. The insurance company deemed the vehicle a total loss. The vehicle was towed to an unknown location. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 14,000.

NHTSA ID

11511941

Incident

Feb 13, 2023

Mileage

1,400 mi

The automatic braking engaged without warning and without cause. There was nothing directly in front of the car that was a possible collision threat. I suffered a neck injury as a result of the force in which the car stopped. Fortunately the driver behind me was able to stop. The car was taken to the original Mazda dealer and I was told this is a problem with my car but that they had no permanent fix, nor the ability to permanently shut off this system available until "corporate got back to them." They did not provide any paperwork and stated "we will call you when we have something." I now have a car I am scared to drive.

NHTSA ID

11475522

Incident

Jul 13, 2022

Randomly accelerated on its own; burns oil- low oil levels twice in 6 months; randomly says cruise control is available under 25 mph when car is traveling at highway speeds; the unlock and lock functions randomly fail; lift gate randomly opens; alarm system randomly goes off; TERRIBLE fuel economy (18-21 mpg)

NHTSA ID

11468850

Incident

Jun 4, 2022

The contact owns a 2021 Mazda CX-30. The contact stated while driving at an unknown speed, the vehicle accelerated independently and hit a brick pillar. The contact stated no warning light was illuminated. The air bags did not deploy. The contact sustained injuries on her neck, back, and also had headaches. The contact did seek medical attention at the emergency room. A police report was filed. The vehicle was not drivable. The vehicle was towed. The contact called the local dealer and made them aware of the failure. The vehicle was not diagnosed or repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 1,000.

NHTSA ID

11453651

Incident

Feb 10, 2022

Mileage

1,000 mi

Sudden, enexpected emergency braking when there was no vehicle or any other obstruction in front of me. Luckily, the distance between me and the car behind me was great enough to prevent me from being rear ended.

NHTSA ID

11418296

Incident

Apr 9, 2021

AFTER TURNING LEFT AT A SIGNALED INTERSECTION ONTO A HIGHWAY THE AUTOMATIC BRAKING ENGAGED AND THE CAR SKIDDED TO A STOP IN THE MIDDLE OF THE LANE. LUCKILY NOBODY WAS BEHIND US. THERE WAS A CAR ABOUT 4 CAR LENGTHS AHEAD THAT WAS GOING THE SAME SPEED AND WAS NOT STOPPED. I PULLED OVER AND CHECKED THE FRONT SENSOR AND NOTICED A COUPLE BLACK FLIES ON IT AND BRUSHED THEM OFF.

NHTSA ID

11416800

Incident

May 16, 2021

Mileage

5,078 mi