2025 Mazda CX-5 Speed Control & Cruise Problems

The vehicle exhibits unintended acceleration behavior when the brake pedal is applied. Instead of slowing down, the engine revs and the vehicle does not decelerate as expected. On March 16, 2026, while merging onto a highway and applying the brakes, the engine suddenly revved to approximately 3,500 RPMs while the vehicle failed to slow down. There have been previous issues with the vehicle not slowing when breaks are being applied, nut this is the first instance when it was noticed that the RPMs increased while breaking. This issue has also been reported to the dealership, with service documentation noting that when applying the brakes, the engine revs and the vehicle does not slow or accelerate properly. This creates a dangerous condition where braking input does not result in expected deceleration and may instead cause acceleration-related behavior. The issue has not been resolved. This issue significantly increases the risk of collision and loss of vehicle control.

While accelerating from a light that had just turned green, after passing through an intersection the vehicle seized up and came to a complete stop. There were no warning lights or any indication of a malfunction. The vehicle did not shut off, the wheels just stopped spinning. After a few seconds it began to accelerate again. It happened on a Sunday, I called the dealership Monday Morning. I was not comfortable driving it after that. They came to pick it up and take it for inspection. Fortunately, no other vehicles were around. This occurred 6 days after purchasing it new. They had it for 2 weeks and said they could not figure what the issue was.

The system that failed was the acceleration. This how it happened the first time, because after that it has happened at least two more in one year. I was leaving my office parking area, and I was waiting for the cars in front of me to continue moving. Then I was ready to start moving and put my foot on the accelerator and just went to a high acceleration. Which I immediately slammed the brakes because otherwise I would have smashed the rear part of the vehicle in front of me. My safety was in jeopardy because if I would have hit the car in front of me and my airbags would have deployed. And the speed of the acceleration was so, that the driver in front of me would have definitely felt it in his neck and God forbids what else!!! Yes, I reported to my dealer, and they said that nothing showed in their computer system, and mentioned something of a throttler not been wrong, (which I don't know what that is). There were no warning lamps or messages in the dashboard prior to the failure. This happened to me again in random occasions where I was just getting my car out of my parking in my condominium, also lucky, it was early in the morning and no cars around. AND the other instance also in my condominium parking area, but this time arriving, and also, lucky no cars near!!!! Your website describes a similar complaint for the same make and model of my car, thus implying that there is a problem with the system.

1.What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle exhibits trembling while idling and previously showed erratic behavior during hard stops. Possible issue with the engine control software or powertrain system. The vehicle is available for inspection upon request. 2.How was your safety or the safety of others put at risk? The trembling at idle and inconsistent braking behavior compromise vehicle stability and driver control, especially in heavy traffic or emergency situations. These symptoms raise serious concerns about a potential underlying defect. Mazda has issued recent software-related recalls involving loss of drive power—though not for my model—which heightens my fear that similar risks may exist. I should not have to wait for a catastrophic failure or breakdown to validate my safety concerns. By then, it may be too late. I do not feel safe driving the vehicle. 3.Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. Mastria Mazda in Raynham, MA acknowledged the issue and performed a software update. While braking behavior improved slightly, the trembling at idle and other concerns persist. 4.Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No formal inspection has been conducted. I mailed a detailed letter to Mazda’s corporate office in Hiroshima in July 2025 and received confirmation of receipt, but no response or inspection followed. I also mailed a letter to Quirk Mazda, the dealership where I purchased the vehicle, and received no reply. When I attempted to discuss the issue the service manager at Quirk Mazda dismissed my concerns and stated it would be “impossible to recreate” the issue. No one from Mazda or its representatives has contacted me to inspect or address the problem. 5. No warning lamps or dashboard messages appeared. The trembling and braking issues began shortly after purchase.