2021 Mazda Mazda3

Radiator leaking coolant requiring replacement at 60k miles. Mazda updated the part which means they know it's bad, should be fixed for free for all affected owners.

NHTSA ID

11776055

Incident

Sep 29, 2026

While driving to work, the dashboard displayed “Charging system malfunction, pull over.” The driver pulled over safely. The vehicle has electric power steering, so a loss of charging power while driving could reduce steering assist and cause the vehicle to stall in traffic. This happened three days after a Mazda dealer replaced the front passenger-side lower control arm. That part had failed at 111,777 miles, causing clunking under braking and making the car unsafe to drive (previously reported to NHTSA). This is the second safety-related failure on this vehicle in two weeks. The vehicle is again off the road pending dealer diagnosis. Reported to Mazda Customer Experience, case #00503860.

NHTSA ID

11770741

Incident

Oct 12, 2026

Vehicle: 2021 Mazda Mazda3 VIN: [XXX] Mileage at failure: 111,777 Date the problem started: [date you first heard the clunk] Location: [town], [XXX] Crash / fire / injury / death: No Was the vehicle moving? Yes Component: Suspension: Front (Lower Control Arm) Description: The front passenger-side lower control arm on my 2021 Mazda3 failed at 111,777 miles. The car began clunking loudly when braking and while driving. My mechanic inspected the car on a lift, identified the lower control arm as the source, and told me the car was not safe to drive. He suspects a failed or defective part. A bolt hole near the rear control arm mount was also found empty, with rust on the threads. The lower control arm holds the front wheel in place and carries the load under braking and steering. A failure like this could cause loss of steering control. The car has been off the road since the failure. I live in [XXX], where roads are heavily salted in winter. Mazda has issued earlier recalls on other models for corrosion in the front lower control arms that could let the ball joints separate. I’m concerned this may be a similar issue. I reported this to Mazda Customer Experience on October 8, 2026 (case number: [number]). The car is scheduled for diagnosis at Thompson’s, an authorized Mazda dealer in [XXX]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11769872

Incident

Oct 7, 2026

Making sharp right turn out of parking lot under hard acceleration, car suddenly made terrible grinding sound that shook the whole car. Continued driving, within another quarter mile the whole car started shaking again with loud noise. Had car towed to Mazda where they discovered that the rear differential had failed. Rear differential replaced under warranty. Noticed faint high pitched sound coming from rear in months leading up to incident. Had differential and transfer case fluid changed less than 1000 miles and 1 month before incident making me wonder if fluid was underfilled/wrong fluid used or the diff was just bad.

NHTSA ID

11767611

Incident

Apr 15, 2025

Low engine oil message appeared on dash. Had car towed to Mazda. Had valve stem seals replaced under warranty.

NHTSA ID

11767608

Incident

Jul 30, 2024

Car made grinding sound with notable vibration when starting to move after shifting into drive. Felt like brakes weren't releasing. Had car towed to dealership where they diagnosed that the front left brake shim was damaged and making contact with the rotor, had to pay to fix it out of pocket.

NHTSA ID

11767607

Incident

Sep 10, 2024

My rear differential case cracked, anytime the four wheel drive system was engaged the entire drivetrain would lock up. Luckily we were only on side roads so going less than 30 mph if we had been on the highway when this happened we could have been in an accident or lost control. The dealer did confirm the problem and it was fixed under an extended warranty. There was no warning just all of a sudden a loud bang and all the wheels locked up. I have a copy of the video inspection done at the dealer if there's anyway to send that. I can get a copy of the repair invoice if needed

NHTSA ID

11713224

Incident

Feb 2, 2025

At 31,000 miles the control arm lower ball joints are torn on both lower. They must be replaced. This is a safety hazard. This should not be an issue with low mileage on this car.

NHTSA ID

11695896

Incident

Oct 25, 2025

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.

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

This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 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 Connected Vehicle enrollment. 2. Remote functions inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Index MAZDA CONNECT 2 Center Display Status Icon MAZDA CONNECT 3 Center Display Status Icon Remote Engine Start Will Not Function Remote Engine Start Function Will turn engine OFF Customer Subscription Status TCU Communication Line Status