2019 Mazda CX-5 Speed Control & Cruise Problems

I purchased a 2019 Mazda CX-5 (As is) on July 20, 2015. On September 11, 2025, as I was traveling on a three lane highway. I attempted to pass another vehicle. As I was attempting to go around the vehicle, my Mazda suddenly began braking and quickly losing acceleration. The speed limit on the highway was 70 mph. I estimated my speed at the time was between 70 and 75 mph as I attempted to pass. Pressing on the accelerator pedal did nothing. I had to try and very carefully steer the car to the right hand side of the road while trying to avoid oncoming traffic approaching from behind. When I finally got the car off the road, this is when I noticed that the car had stalled. The car started right back up and I continued to my appointment. The "radar cruise control" was activated at the time of the incident. On September 15, 2025, I contacted the dealer where the car was purchased and explained what happened. I was asked to bring the car in that same day. The car was supposedly looked over and connected to the Service Dept.'s computer to see if any error sign appeared. Nothing showed up. I service technician was then asked to ride with me to see if the car would replicated the same stalling as it has previously done. We could not get the car to stall as it had previously done. Before leaving, a salesman asked me if I wanted him to explain the "radar cruise control" to me some more. I agreed. The salesman then proceeded to tell me that "the car did not stall, it was simply braking from the activation of the radar cruise control". Being an experienced driver, I told the salesman that the car had stalled as evidenced by the fact that I had to restart it. The situation was not resolved to my satisfaction, but no other offers were made by the dealer. I requested additional diagnostic work to be done, but the dealer refused to cooperate. I did take the car to another Mazda dealer, but could get no offer but to connect the car to their computer.

For the 3rd or 4th time since I have own this car I experienced a loss of acceleration when attempting to make quick acceleration while attempting to merge with traffic. Acceleration is fine around town where quick acceleration is not appropriate. But the first attempt to merge with flowing traffic the car will slowly accelerates to about 30 mph and no more regardless as to position of accelerator pedal. On all occasion this bad behavior has this first drive of the day - going to work in the a.m. There is often a warning message indicating the safety radar is not working due to limited visibility which is a very common warning in the a.m.

Went to drive home from work one night, car had been normal until this event. Car suddenly began to state that it was overheating and throttled my speed down to 20 MPH. I was in the middle of traffic going 40-50 at this time. Turns out there is a VSB regarding a coolant leak that can occur and break. Nothing about how you are suddenly governed to 20 MPH

On interstate 90 while driving at 75 mph under cruise control I passed an 18 wheel truck on a curve. With no cars in front and two following, the car without warning braked heavily and control screen flashed warning BRAKE. The car immediately behind braked and veered on the bearm to avoid me. I stepped on gas to override the brakes and avoid an accident.

The contact owns a 2019 Mazda CX-5. The contact stated that on five separate occasions, intermittently there was an abnormal grinding noise detected underneath the hood. The contact stated that while driving 65 mph, the vehicle inadvertently decelerated to 20 mph. Additionally, while accelerating the vehicle slowed down without warning. The vehicle was taken to an independent mechanic where no codes had been detected. The vehicle was towed to the local dealer where they were unable to duplicate the failure. The vehicle was not diagnosed nor repaired. Additionally, the vehicle was towed to Sport Mazda North (400 N US Hwy 17 92, Longwood, FL 32750, (407) 339-4777) where they were unable to duplicate the failure. The vehicle was not diagnosed nor repaired. The manufacturer was notified of the failure. The failure mileage was approximately 17,000.

MRCC (MAZDA RADAR CRUISE CONTROL) WILL UNEXPECTEDLY DECREASE VEHICLE SPEED WHEN IN A TURN EVEN IF NOT FOLLOWING ANOTHER VEHICLE. SPEED DECREASE HAPPENS REGARDLESS OF VEHICLE SPEED. AMOUNT OF DECREASE IS SEVERE DEPENDING ON "SHARPNESS" OF THE TURN, BUT WILL HAPPEN EVEN ON GENTLE SWEEPING TURNS ON AN INTERSTATE HIGHWAY. BEHAVIOR IS REPRODUCIBLE DURING ALL VARIETY OF DRIVING CONDITIONS.

CAR ACCELERATES BY IT SELF FROM STANDING STOP.PULLING OUT OF PARKING STALL SHIFTING TO DRIVE CAR ACCELERATES TILL I PRESS BRAKE TWICE. THEN AFTER SLOWLY DRIVING OVER SPEED BUMP CAR ACCELERATED UP TO 25 TO 30 MPH TILL I PRESSED BRAKE TWICE . CAR NEW HAS 1800 MILES