Mazda MAZDA3 adaptive cruise problems

Filed May 31, 2026 · Acceleration · FL

When turning a corner in my neighborhood, as I got around the corner (slow speed (10 MPH?). The car gradually sped up on it's own without pushing the gas pedal. No cruise on and no floor mat problem. While in cruise control "on", the engine "reved up. Took the vehicle to the dealer, they could not find a problem.

Filed Jul 21, 2023 · Driver assistance · NV

on 3 occasions may 2023, June 2023 and July 2023 the forward Collison camera activated. in May and June it showed the vehicle to near stop like radar cruise control in rush hour speed traffic. in July 2023 it sounded the alarm and came to a full stop in heavy traffic. it occurs on bright hot days going straight no turns no oncoming traffic no traffic around and no obstacles hold or dips. this can cause the car to stop immediately and cause an accident. App detects problem with system but dealer cannot find problem and blame camera or GPS or satellite radio factory equipped.

Filed Aug 23, 2021 · Driver assistance · ID

The Mazda Radar Cruise Control (MRCC) system performs poorly (it does not hold a set speed well up and down hill; compared to our 2006 Mazda3), but the safety concern is the forceful, sudden, and not-always-predictable braking the vehicle does even if there is not another vehicle in front of us. It brakes, sometimes, for a vehicle in the right lane (we, in the left), and continues to brake unless we override the system. No problem--except if there may be someone following too closely, it could cause a collision. It seems to be related to the MRCC, as no "Brake!" warning accompanies the unwanted brake application. I've contacted Mazda numerous times; they recommended taking it to the dealer. I have--they can find nothing wrong. All of this seems related to a MRCC update (SSP C5) that was done to smooth the MRCC's operation. It did fix the sudden deceleration and acceleration when following other vehicles, but now is worse in other aspects. I may be wrong, but it all seems to be a software issue, so it's not surprising that the dealer can find "no concerns". As to the date of this incident, it happens nearly every time we take the car on a highway or interstate.

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 May 27, 2020 · Acceleration, Electrical · 5,000 miles · AR

Radar cruise control malfunction and safety systems malfunction frequently. Safety systems completely disable without warning periodically while driving. Radar cruise control doesn't work randomly. Mazda dealership can't replicate the issue. Other 2019 mazda 3 owners have the exact issue and no recall or fix has been issued.

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 Jul 20, 2019 · Transmission · 336 miles · CA

A safety critical incident occurred on my new 2019 mazda 3 hatchback when the vehicle when into "limp" mode while adaptive cruise control was engaged at highway speeds leading to rapid deceleration. The vehicle was towed to the nearest manufacturer service location where a diagnostic was performed. Codes show that communication between the central vehicle processor and multiple sub-processors failed simultaneously. Comments were made by manufacturer service representatives that failure mode is likely different from the recent cylinder deactivation/rocker arm recall. Service representatives were instructed to simply clear the codes and drive the vehicle to attempt to reproduce the failure during which it did not occur. I have attached a sanitized version of the service receipt to this message with the full list of codes. Unfortunately mazda's representatives were unable to provide any explanation on why this failure occurred or what will be done to prevent it in the future. Engineering analysis will need to be performed to reach an acceptable conclusion. Environmental factors relating to the incident include a very hot outside air temperature, with a reading of 115 deg f from the vehicle's sensor roughly 15 minutes before the incident. The incident also occurred on a very long section of us highway with a consistent, gradual incline. Given that information potential causes are intermittent computer hardware failure in high temperature environments, or a software error in power train control or cruise control causing a communication bus failure. With the age and mileage of the vehicle (336 mi) the potential for this failure occurring is likely present in a large portion of new mazda vehicles.

Filed Dec 17, 2018 · Acceleration, Engine · 54,000 miles · NC

Tl* the contact owns a 2016 mazda 3. While driving 75 MPH with the cruise control engaged, the contact depressed the brake pedal, but the vehicle accelerated. Upon depressing the brake pedal for the third time, the vehicle stalled and completely shut off. When the vehicle restarted, the check engine indicator flashed. The vehicle was not taken to a dealer for diagnostic testing or repairs. The manufacturer was not made aware of the failure. The failure mileage was 54,000.

Filed Jul 16, 2018 · Acceleration, Fuel system · 34 miles · MD

When I let off of the accelerator it still maintains the speed it was going before I let off the accelerator. The dealer told me that's how its design. He even took it for a ride and said see it still keeps the speed I said its not cruise control. I had contacted the dealer and mazdausa. Mazdausa ignores me. I just need to get this fixed before someone gets hurt. When I go to pass it stays for a while at the speed I hit before I release the accelerator.

Filed Jul 7, 2017 · Brakes, Electrical · 85,000 miles · CO

The car will intermittently not shift out of park due to the shift lock not releasing properly, and the stop lights and horn are not functioning properly as well. This seams to be typical of the mazda3's due to the horn shorting the fuse and the brake switch going bad, and definitely makes the car more accident prone. Others seam to report the cruise control functions stop working due to the same fuse being used for stop lights and the cruise control function.