2020 Mazda CX-5

The Smart Brake Support system malfunctioned while driving. The vehicle began shaking and lost power, requiring excessive throttle to move. The car hesitates and may not accelerate normally, creating a dangerous situation in traffic. Warning lights appeared on the dashboard and the vehicle became unsafe to operate. The issue occurred shortly after purchase and was reproduced multiple times. The dealer inspected the vehicle but refused to provide a written diagnosis or repair timeline. The vehicle is unreliable and poses a risk of sudden loss of control or rear-end collision.

The contact owned a 2020 Mazda CX-5. The contact stated that while driving under 45 MPH, the TCM received a false data sensor warning, causing the vehicle to enter LIMP Mode. The contact stated that during the failure, the smart brake feature, Adaptive Cruise Control, and other unknown ADS features and warning lights were illuminated. The contact stated that the failure with the ADS system prompted the vehicle to come to a complete stop while driving 45 MPH. The contact parked and turned off the vehicle to troubleshoot the ECU after the failure had occurred. The contact restarted the vehicle, and the adaptive cruise control warning light, smart brake feature, and ADS radar features returned. The vehicle was not repaired. The manufacturer was notified about the failure. The failure mileage was 140,000.

I purchased this vehicle as a used car from a dealership. On my way home, the infotainment panel began to shout at top volume that this is the volume that navigation would be set at. The volume was so loud that it was startling, and it continued on until I had to pull over. I contacted the dealer, but they offered no assistance. The car continues to control itself at the panel ferning with the use of android auto so that you can't use your phone GPS for directions. The radio will control itself, changing stations, making loud beeps, and turning the volume up. There is no way to stop this feature because you can't turn the system completely off while the car is on. I can find no way to fix this on my own. I have tried resets, but have seen ample information about other people having this problem online. This does not seem to be an unknown problem and I don't know why there has not been issued a recall because it's very dangerous.

The issue is iron is depositing in the transmission due to a bad torque converter, this is a known issue with mazda and it doesn't seem to be something they are willing to cover and many people are experiencing this especially with the cx5 models. It causes jerking and chirping noise, plus will eventually ruin the transmission and will cause serious safety issues. Just look into the reddit threads

Driving about 20 to 35 mph accelerating I would get a distinctive one time chirp noise with a little bit of a stutter It happens every time I go about that speed accelerating. Thankfully my car was under pre-owned warranty but I have to get now. Three transmission flushes I have to pay $400 for and they have to replace a torque converter. I just got the car 10 days ago and only has 61,000 mi on it. Over the long term this could damage the transmission cause more and more issues

The ongoing “ghost touch” defect in Mazda infotainment systems is a serious safety hazard that should have triggered a recall. This issue affects vehicles from model years 2016 through 2023 and stems from a design flaw present from the beginning. While driving, the system can suddenly take control of the screen—changing settings, switching stations, adjusting navigation, and even blasting the volume to maximum without driver input. On multiple occasions, I have been driving at freeway speeds when the system suddenly raised the volume to its highest level, jolting me and creating a dangerous distraction that nearly caused an accident. Mazda previously settled a lawsuit regarding this defect but only offered a free software update as a remedy. When I visited a dealership, I was told I already had the latest update—and that it does not resolve the ghost touch problem. The dealership acknowledged that it is a known design flaw, yet Mazda is charging customers around $800 to replace the defective component. This defect is widespread across multiple model years, worsens with time, and compromises the safe operation of the vehicle. Despite owning my Mazda outright and having only 40,000 miles on it, I may be forced to sell it because the vehicle has become unsafe to drive. I have a video of some of the things it does but it won’t let me upload it below.