368 of the
4,006 complaints filed about the Mazda MAZDA3
are about the electrical system —
9% of everything owners reported.
The worst model year for it is 2010.
The vehicle's Connectivity Master Unit (CMU) / infotainment system has experienced a complete, permanent internal electronic failure, logged by Diagnostic Trouble Code DTC U3000:49 (Control Module Internal Electronic Failure). The main display screen is completely dark at all times and never powers on or responds. The unit is available for inspection upon request. This total hardware failure creates critical safety hazards: 1. Non-Compliance with FMVSS No. 111 (Rear Visibility): Because the rearview camera relies entirely on the main display screen, the backup camera is 100% inoperative. When shifting into Reverse, the screen remains black, offering zero rearward visibility and creating an immediate backover risk to pedestrians, children, and property. 2. Complete Loss of Driver Assistance & Emergency Systems: The permanently dark display eliminates access to active safety guidance, rear cross-traffic visual alerts, parking distance indicators, turn-by-turn navigation, and hands-free emergency communication interfaces. 3. Ongoing Driver Distraction: Operating the vehicle without essential safety/navigation displays requires additional driver focus, causing persistent cognitive distraction. The failure was confirmed via professional OBD-II diagnostic scanning showing DTC U3000:49, which explicitly denotes an unprovoked internal component failure rather than wear and tear. The manufacturer has declined to repair or replace the failed assembly out of warranty.
NHTSA complaint #11756362 — an unverified report by a vehicle owner.
I was denied work on a network issue recall 3 separate times at the dealership I bought the car. The first time I was told it was because of a smell. If I clean the car, they will fix it. I noticed after they were in the car my backup camera didn’t work which I also thought might be a recall but found out it wasnt. I went ahead and cleaned it twice. I came back they alleged it smelled like cat litter and urine. I asked to speak to someone else because there was nothing in my car and I know it didn’t. There were also no stains, mold, anything like that. It smelled of cleaning products. But I took it home and scrubbed extensively even though I was confused by the comment. When I went there it was smelling like lemon. Zero stains, mold, nothing in the car but maybe a little sand and baking soda. The person went as far as to say wow the car is improved said but thry still sorta smell it and there’s stuff on the window (there wasn’t). At that point I knew I was being picked on because either they didn’t know how to fix it or didn’t want to work with me. It felt discriminatory and differential to others. I now have a super clean car but a network issue and no backup camera because of this. They claim now they fixed everything but a non-safety issue but I also still have two errors that say “telematics” and “networking issue have vehicle inspected.” I believe I have rights under NC lemon law as this is within 24 months of purchase with only 4600 miles
NHTSA complaint #11755539 — an unverified report by a vehicle owner.
The AT light came on the dash, added transmission fluid because it was a little low but the light still has not gone off. I think there is an electrical problem within the transmission. It's had shifting issues since purchasing this vehicle. I also have a small child that comes with me to work and I do not want my car to catch on fire while we are in this vehicle.
NHTSA complaint #11729138 — an unverified report by a vehicle owner.
The center dashboard information screen developed "spider cracks" and got opaque in the corners of the screen. The screen would change functions / jump around commands without being touched while driving ( from NAV to radio, change radio stations etc) - apparently called 'Ghost Touch". Mazda has been aware of the defect for some time and issued a TSB ( and settled a class action lawsuit) but we never received any notification. The dealer offered no assistance as the car was out of warranty . We paid several hundred dollars to replace the screen as the car was becoming undriveable.
NHTSA complaint #11714999 — an unverified report by a vehicle owner.
On 14th, 2026, while traveling at approximately 60 mph on the northbound 55 Freeway near the Katella exit, my vehicle suddenly began to shake violently without any prior warning. In response, I attempted to slow down by applying the brakes; however, the speedometer rapidly increased even as I maintained firm pressure on the brake pedal. Immediately afterward, the vehicle pulled sharply to the left, causing a complete loss of steering control and resulting in a collision with the center median barrier. Despite the force of the impact, the airbags did not deploy, raising additional concerns about potential safety system failures. At no point before the incident were there warning lights, alerts, or indications of mechanical or electronic issues. The vehicle had also undergone its regularly scheduled maintenance at the Tustin Mazda dealership on January 2nd, 2026, just prior to the accident. Given the sudden shaking, unintended acceleration, loss of braking effectiveness, steering failure, and non‑deployment of airbags, I believe this incident may involve one or more manufacturer defects affecting critical safety systems. I respectfully request that NHTSA investigate this matter. I also believe the vehicle’s Event Data Recorder (EDR) may contain information relevant to identifying the root cause of these failures.
NHTSA complaint #11712753 — an unverified report by a vehicle owner.
NHTSA Complaint Narrative I am filing this complaint regarding a 2010 Mazda 3, VIN [XXX] . The vehicle experiences intermittent transmission control failures, including difficulty shifting out of first gear and warning indicators triggered by vibration. The transmission and transmission control module have already been replaced. The dealership has identified the wiring harness as the cause of the remaining failure. Mazda North American Operations has confirmed that the required wiring harness (BBM9-67-020H) is discontinued and unavailable. However, Mazda has not provided a written determination of whether the known wiring harness recall (engine wiring harness chafing affecting control systems) applies to this VIN, nor confirmed recall completion history. Mazda has advised the customer to seek aftermarket or salvage parts, but has not provided an approved repair remedy or goodwill assistance despite the issue affecting drivability and safety. I am requesting that NHTSA review whether Mazda has met its obligations regarding: 1.recall applicability determination by VIN, and 2.providing an adequate remedy when OEM repair parts are no longer available for a safety-related defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11710562 — an unverified report by a vehicle owner.
The contact owns a 2016 Mazda Mazda3. The contact stated that while driving and while starting the vehicle, the instrument cluster was inoperable. The contact also stated that the instrument cluster screen was peeling, and critical information for the vehicle was not displayed. Additionally, the infotainment system became intermittently inoperable due to the failure. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The contact expressed concerns that the inoperable instrument cluster created a hazardous and unsafe condition due to the complete loss of instrument panel functionality. The approximate failure mileage was 142,000.
NHTSA complaint #11709605 — an unverified report by a vehicle owner.
“My 2022 Mazda 3 is experiencing an ‘in-network malfunction’ related to the vehicle’s internal communication system. Multiple technicians have told me this is an internal vehicle network/communication fault, not caused by wear or damage. The dealer refuses to repair it unless I pay out-of-pocket, even though this appears to be a manufacturer defect in the electrical network system, (TCU)This malfunction affects the reliability of the vehicle’s electronics and could impact safety systems while driving. Mazda has not taken responsibility for diagnosing or repairing the issue, and I believe this defect needs to be investigated, as other owners may be affected as well.”
NHTSA complaint #11703034 — an unverified report by a vehicle owner.
My 2018 Mazda 3 has an intermittent electrical failure on the high-speed CAN network that causes multiple safety-critical systems to fail while driving. When the fault occurs, the dash lights up with warnings for powertrain, ABS/traction, lane departure, collision-avoidance, TPMS, immobilizer, and the check-engine light. The car also hesitates or “lurches” between 15–30 mph during these events. At one point in 2024, the vehicle went into limp mode on the freeway, creating a safety hazard. These failures are intermittent but repeatable. Diagnostic scans from 2023–2025 show multiple U-codes for lost communication between control modules; two later became permanent. The issue appears unrelated to any one component and affects many systems at once. The vehicle has been to every Mazda dealership in the North Texas region (Mesquite, Freeman, Hiley, Norm Reeves, Town North). All performed only basic scans; none completed a full CAN-bus or wiring-harness diagnostic. Town North kept the vehicle for six weeks (Sept–Oct 2025), replaced a coil and spark plugs, performed a camera calibration and a TCM update, but the network failures returned within 38 miles. We sought independent inspection only after dealerships repeatedly refused diagnosis whenever the warning lights were not on at the moment of arrival. In November 2025, a technician found significant internal corrosion inside the negative battery cable; touching the cable reproduced the full failure immediately. The corrosion extends deep into the wire sheathing. This appears to be an electrical defect affecting CAN communication and power/ground integrity. When the fault occurs, multiple safety systems disable at once and the vehicle behaves unpredictably. Mazda Corporate has declined further assistance, and the defect remains unresolved. I am filing this report because this is a recurring safety issue that may affect other vehicles of the same model and year.
NHTSA complaint #11700428 — an unverified report by a vehicle owner.
Car doesn't start if sitting more than 4 days untouched. When i went to the dealer, they informed me they know about the issue but nothing can be done about it. They even told me what the issue was, there's something in the car (they don't know what) that draws a lot of power non stop. kills the battery and some time will get stuck mid ignition. I've replaced the battery a few times as well. It's very stressful trying to deal with it after a 12-16 hour shift at work. knowing it will happened again and again, over and over.
NHTSA complaint #11693896 — an unverified report by a vehicle owner.
Odometer Fraud. The contact purchased a 2014 Mazda Mazda3. The contact stated that the vehicle was making an abnormal growling sound. The check engine warning light was illuminated. The contact discovered a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 140,000. The vehicle was taken to the local dealer, where it was diagnosed and determined that the motor mounts needed to be replaced. It was later discovered that the Title mileage was 197,687.
NHTSA complaint #11689873 — an unverified report by a vehicle owner.
The Infotainment System will randomly change radio stations while driving, or start scanning through the various system menus, and on at least in one case, started randomly making phone calls from a connected phone. This creates a major distraction while driving. This has been looked at by the dealership and would cost $1500 for the system repair. I understand that this is a known problem.
NHTSA complaint #11683859 — an unverified report by a vehicle owner.
Repeated instances of the Mazda Infotainment system making changes randomly without any user input while driving. Repeated instances of the navigation system freezing, going black, rebooting while driving.
NHTSA complaint #11676786 — an unverified report by a vehicle owner.
Car gives me emergency brake warnings about imminent collision maybe once or twice a week with nothing in front of me what so ever and once even straight up just brought me to a complete halt in the middle of the road with absolutely nothing in the road. The dealership basically told me it was a known issue and that “some models are more sensitive than others” and that they will be doing nothing about it. Different models of Mazda 3s from the same year are currently being investigated for the same recalls. This definitely needs to be addressed before I get into an accident.
NHTSA complaint #11676800 — an unverified report by a vehicle owner.
There is a infotainment display that sits on the center part of the dash that has touch screen capability that over time starts to fail and results in what is known as "ghost touch", where random screen settings change as though someone is using the touch screen on the infotainment screen. I had issues to where settings for screen brightness have changed causing my ability to see the controls being hindered and the radio sometimes turning up loudly and then off causing a scare distraction while driving. This screen is also used for the back up camera. There is currently a class action lawsuit for this.
NHTSA complaint #11671421 — an unverified report by a vehicle owner.
The car screen displays, GPS, for calls, radio etc, doesn’t works, it’s off, and the airbags are deactivated and they’re off as well and have to press hard on the brake to get the car to stops.
NHTSA complaint #11669855 — an unverified report by a vehicle owner.
The a.b.s pump module is defective in these vehicles. There are tons of people having issues with them. When they fail it happens suddenly resulting in brake failure, power steering failure, the car does not like to shut off, the vehicle will go into "limp mode" and every light on the dash comes on. The part itself is costing close to $1000 u.s.d . With all of tge effected things tgat go with it i believe it can be very dangerous and should be recalled
NHTSA complaint #11655220 — an unverified report by a vehicle owner.
During the incident, the vehicle exhibited an uncontrollable malfunction—the steering wheel suddenly jerked sharply to the right while accelerating violently, leaving me unable to steer or brake effectively, the car was looking forward. The car ultimately came to a stop upon colliding with a truck parked diagonally in front of me. After impact, I observed that the front tires remained stuck in a turned-right position, with the steering wheel also locked in that position. This was not an isolated event. Multiple reports from Mazda owners describe similar experiences with their vehicles unexpectedly veering to the right and accelerating without driver input. Given these recurring reports and my own experience, I strongly suspect that a manufacturing defect—whether mechanical, electronic, or software-related—may have contributed to this accident.
NHTSA complaint #11645615 — an unverified report by a vehicle owner.
The driver window, upon attempted to be let up, will start to go up then go all the way down, ignoring the function to go up. This is a safety concern, as harsh temperatures and foreign objects are able to enter the vehicle cabin at any time, including driving. The problem has been reproduced by a dealer, and the vehicle is available for inspection upon request. There are no warning indicators for this issue beyond witness the failure occur in real time.
NHTSA complaint #11644043 — an unverified report by a vehicle owner.