2024 Mazda CX-30

I am reporting multiple serious safety-related mechanical failures involving my 2024 Mazda CX-30, all occurring while the vehicle was covered under Mazda’s manufacturer’s warranty. At approximately 8,000 miles, my vehicle developed seized brake calipers. Despite bringing the vehicle to an authorized Mazda dealership multiple times, my concerns were initially dismissed. I continued operating the vehicle for thousands of miles before the brake calipers, rotors, and pads were replaced. This raises serious concerns regarding braking performance and the safety of myself and other motorists. On October 13, 2025, at approximately 41,000 miles, my vehicle experienced a complete transmission failure, leaving me stranded and requiring towing. The transmission was subsequently replaced under warranty. My vehicle has also unexpectedly shut down while being driven on public roads on multiple occasions. On July 10, 2026, the vehicle broke down on a narrow, winding, two-lane roadway. The vehicle displayed a message instructing me to place it in Park. These unexpected failures created dangerous situations, potentially exposing me and surrounding motorists to collisions, particularly where safe stopping areas were limited. Additional warranty-related failures have included oil leaks from the oil pan and timing chain cover, forward-facing camera and driver-assistance system malfunctions, and other mechanical concerns. These problems have been reported to authorized Mazda dealerships, and multiple components have been inspected, repaired, or replaced under warranty. Despite extensive repairs, I remain concerned about the vehicle’s overall safety and reliability. I am requesting that NHTSA investigate the repeated braking, transmission, and unexpected vehicle shutdown incidents. A relatively new vehicle should not repeatedly experience failures that could endanger its occupants and other drivers. I am concerned that these failures may indicate broader safety defects requiring inv

NHTSA ID

11776724

Incident

Jul 10, 2026

The contact owns a 2024 Mazda CX-30. While driving 30 MPH, the vehicle experienced unintended braking. During the failure, the vehicle unexpectedly downshifted to first gear with a red circular warning light illuminated on the instrument panel with an audible chime. The contact stated that the "Smart Brake Support" feature could prevent the failure from occurring; however, the setting could not be saved and had to be manually disengaged. The failure mileage was approximately 10,000.

NHTSA ID

11774432

Incident

Oct 29, 2026

Mileage

10,000 mi

Since purchasing the vehicle, the braking system has activated on its own for no reason. Today, Oct 19, 2026, it was cold and it said the system was failing. My camera system fails when it rains. My 2024 Mazda CX-30 has 62,000 miles and is experiencing the exact catastrophic phantom braking and forward camera failures detailed in NHTSA Recall 24V649000 (Mazda Campaign 6824H). My VIN is currently excluded from the recall campaign, but the vehicle is a severe highway safety hazard due to spontaneous unprovoked braking

NHTSA ID

11772129

Incident

May 16, 2025

Airbags did not deploy, sensors keep going off, car keeps over heating even before accident did take it in to Mazda to be fixed two months prior.

NHTSA ID

11771748

Incident

Jun 2, 2026

The vehicle is experiencing premature transmission failure, since about 9,000 miles. Mazda has been dropping the ball at replacing it under warranty and we found out there are 3 other CX-30s that I know of with similar issues. I believe Mazda has a faulty transmission in these cars based off my findings and other complaints.

NHTSA ID

11762963

Incident

May 4, 2026

What is happening with my car are the exact symptoms of the known Mazda Recall 6824H - where the Smart Brake Support suddenly engages for no reason and when it does not need to - which has almost caused me to be rear-ended a few times. This has happened at least 7-8 times since I have owned the vehicle. Apparently, my VIN does not fall under the cars that Mazda reports for the Recall, but nonetheless, my car is still malfunctioning as the Recall describes, which is a safety issue for me. The Recall also states: "Due to an improper program setting, affected FSC (cameras) were not updated from production mode to normal mode. As a result, all three systems described (HBC, SBS, LAS) will not work as intended." My cameras are definitely not working as they should. I have had it in for service, and the technicians have not done anything at all. The Recall should definitely be expanded to owners experiencing these issues. As I have stated above, this incident has occurred at least 7-8 times, so I'll just enter in the most recent time that it happened in the Additional Details below since I cannot enter all of them. Thank you.

NHTSA ID

11760963

Incident

Jul 22, 2026

Reporting Product Defect in Mazda Vehicles I am writing to bring to your attention a recurring design flaw affecting current Mazda vehicles, including models such as CX30, MX30, and potentially the Mazda3 series. Following heavy rain or high humidity conditions, there is a consistent issue with the tire pressure sensor alarming and the smart key being unable to unlock the car doors. I have checked my key fob battery, RF function, car battery - none of these are the root cause. Despite consulting local dealerships and various Mazda forums, no one seems to have a definitive solution to this problem. Therefore, I am reaching out to report the existence of this product defect. This issue appears to be more prevalent during summer in Arizona - after the thunderstorms, this issue came up every time. Even with the heat here, it takes from several hours to 2 days for the affected part to dry out and function again.

NHTSA ID

11757051

Incident

Jul 28, 2026

When I first got my Mazda CX30 2024 New lease ,my Breaks were very weak & didn't perform as new. Only 2 years later w 9K miles on it, Mazda states my breaks need to be replaced. My rotors need to be shave. A whole list of services on a car thats 2 years old. My concern is, break service at 9K confirm my car wasn't new and that Mazda put my Safety at risk w Old Breaks... Mazda is hiding somerhing about my breaks playing games...in the mean time I feel my safety is in jeopardy with defective breaks that maza should fully cover under warranty. Which they won't honor. Putting my safety in jeopardy

NHTSA ID

11754347

Incident

Jul 8, 2026

Subject: Update – Campaign Warranty Claim Response Enhancements – Modules Not Repaired for Certain Campaigns Dear Mazda Dealer Colleagues, On October 28, 2026, a change was implemented in the warranty claim response screen to provide precise information for all campaigns requiring module programming or module replacement subject to the LECS system software checks. As previously announced, some claims were automatically rejected with the Edit code JN1 – One or More Modules Are Not Updated when submitting a campaign warranty claim. This response was based on the session file received from MDARS or MDARS II at the dealership and the VIN on the claim submitted. This change provides additional Related Information which enhances the edit code information. This information allows the dealer to correct the error without contacting Warranty or Hotline. Edit code JN1 now contains the actual module name and the software version that was collected from the car and what the minimum required software needed to be for the claim. Using this information, the technician can now identify the exact error or errors and correct the concern.

Some customers may complain about any of the following 1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App Connected Vehicle enrollment. 2. Remote function(s) inoperative.

DESCRIPTION Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail. The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT REPAIR PROCEDURE 1. Verify the concern. 2. Check if any of the following DTCs are stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT Are the following DTCs stored? YES: Proceed to next step. NO: This service information does not apply. Continue troubleshooting using MGSS.

Mazda Connected Services - Frequently Asked Questions (FAQ) This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA-042/26 06/30/26 DESCRIPTION Frequently Asked Questions (FAQ) Index General Questions MAZDA CONNECT Indication Setup and Getting Started Dealer Processes Registration / Enrollment / Take-Over Customer Subscription Status WI-FI General Informatio Opening the TCU Communication Line WI-FI How-To Conditions for Remote Engine Start Will Not Function WI-FI Trial Period Conditions for Remote Engine Start Function Will turn engine OFF Interacting With The App TCU Communication Line Status Service Issues Educational Videos Troubleshooting Resources MyMazda App Error Codes Customer Opt-Out

DESCRIPTION If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices. Examples: 1. Devices connected to the DLC-2 (battery discharge/DTC stored) 2. Devices plugged into the 12V outlet 3. GPS tracking device (engine no start/battery discharge) 4. Dash cam (DTC stored) 5. Non-certified USB cable (Apple Carplay™/ Android Auto™ will not connect) 6. Over-sized wheels/tires (incorrect GPS location) 7. DTC C0023:14 8. Decorative trim and/or cover on the START/STOP ENGINE button

This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 08/18/26 and 06/15/26 DESCRIPTION Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App