Mazda MAZDA3 transmission problems

POWER TRAIN

Transmission failure when driving. Car was towed to dealership and diagnosed. Transmission and torque converter replacement required under factory warranty. Very long lead time for dealer to acquire replacement parts, about 4 months.

NHTSA complaint #11724188 — an unverified report by a vehicle owner.

POWER TRAIN

My Mazda3 began producing a chirp when shifting from 3rd to 4th gear (automatic transmission). The dealer stated that the car needed a new torque converter. At the time the car only 37,000 miles on it, quite low mileage for a torque converter to fail. Mazda has previously admitted to producing cars with faulty torque converters, as specified in Mazda TXXXXXX] ). While my car fit the description of both the problem and proposed fix, and also fell within the applicable models/VINs listed on the TSB, Mazda corporate HQ stated that my specific VIN was not covered by the TSB, and therefore the repair cost was my responsibility. Since the problem, solution, and general vehicle type are entirely as described in the TSB, it appears possible that the TSB was too narrowly scoped and omitted impacted vehicles, to the detriment of owners. This would also cause potential safety concerns, since an unrepaired torque converter could produce unexpected shifting problems. Therefore I suggest that NHTSA investigate to determine if additional vehicles are impacted by Mazda's faulty torque converters. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11719227 — an unverified report by a vehicle owner.

POWER TRAIN

left-most lane of a three-lane highway, I pressed the accelerator to maintain the flow of traffic. The vehicle suddenly began revving between 4,000–5,000 RPM without increasing speed. When I attempted to accelerate again, the RPM remained around 3,000, and I immediately received multiple warning messages on the dashboard, including: “Skyactiv Partially Disabled” warning Engine Malfunction warning ATF (Automatic Transmission Fluid) warning light Simultaneously, the vehicle rapidly decelerated from 65 MPH to approximately 55 MPH, creating an extremely hazardous situation and nearly resulting in a collision. I had to carefully maneuver across lanes to reach the shoulder. After shutting the vehicle off and restarting it, the warning lights temporarily cleared; however, the vehicle appeared to be operating in limp mode. I had the car towed home via AAA. After this near-fatal incident, I scanned the vehicle using an OBD2 reader and retrieved diagnostic trouble codes P0780 and P0761, indicating Shift Malfunction and Shift Solenoid 3 Performance issues. To address the issue proactively, I had my mechanic perform two full transmission fluid and filter exchanges on Monday, February 16, 2026, and again on February 18, 2026. Both services included a pan drop, replacement of the transmission filter, use of Mazda OEM transmission fluid (0000A7115QT and FZ01-21-500), and a complete transmission relearn procedure after each service. Despite these efforts, the same codes (P0761 and P0780) reappeared when scanned with a professional-grade diagnostic tool. The battery has been tested and confirmed fully charged. Additionally, my mechanic identified oil leaking from the timing chain cover.

NHTSA complaint #11718990 — an unverified report by a vehicle owner.

POWER TRAIN

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 complaint #11713224 — an unverified report by a vehicle owner.

POWER TRAIN

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.

POWER TRAIN

What component or system failed or malfunctioned, and is it available for inspection upon request? The high-pressure fuel pump failed. This component failure prevents the car from starting or staying running. The check engine code confirmed the high-pressure fuel pump failure. The failed component is currently at the Mazda dealership and is available for inspection upon request. How was your safety or the safety of others put at risk The car suddenly stalled while driving on the roadway, creating a dangerous situation. If this had happened on the freeway or in fast-moving traffic, it could have led to a serious accident. Losing power and control of the vehicle at higher speeds poses a major safety risk to both the driver and surrounding vehicles. I was fortunate that the failure occurred on a city street rather than on the freeway. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. The Mazda dealership inspected the vehicle and confirmed that the high-pressure fuel pump had failed, which was also verified by the check engine code. This failure caused the stalling and starting issues. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? The vehicle was inspected by an authorized Mazda dealership, which diagnosed and confirmed the high-pressure fuel pump failure. It has not been inspected by police or insurance representatives. Were there any warning lamps, messages, or other symptoms of the problem prior to the failure, and when did they first appear? Before the final failure, the car was hesitant to start, and after it stalled, the check engine light appeared. There were no prior warning messages or signs before the car suddenly stalled while driving. Additional details: The car is only seven years old with approximately 52,000 miles, and it is concerning that such a critical component would fail this early.

NHTSA complaint #11694610 — an unverified report by a vehicle owner.

POWER TRAIN

I am writing to formally report a serious safety issue with my 2016 Mazda 3 manual transmission, which experienced a sudden and complete clutch failure at less 60,000 miles — without any warning lights or diagnostic alerts. I am deeply concerned that: •There was no dashboard warning, even as the clutch system failed •The gear indicator was inaccurate in prior days, which may have been an early sign of failure •There was no protection mechanism to prevent complete drivetrain failure during normal use.

NHTSA complaint #11678732 — an unverified report by a vehicle owner.

POWER TRAIN

I was driving when all the sudden there was a loud bang sound. The differential housing cracked. The when awd is demanded the rear diff was was locking up instead of engaging. Luckily we were just on city streets and not on the highway as this rear wheel locking up could cause a crash. Mazda wasn't very helpful with the replacement. Luckily I had a aftermarket warranty but it only paid for a used replacement, which is also failing. I have read lots of stories of this rear differential failure across all types of Mazda's from this era and really wish they would do the correct thing and resolve the problem.

NHTSA complaint #11663288 — an unverified report by a vehicle owner.

POWER TRAIN

1. Automatic transmission suffered a catastrophic failure during operation. Transmission was discarded by Bountiful Mazda, Utah. 2. Both other and I were at risk as the vehicle could not be controlled. 3. I read similar findings on Social Media posts. 4. Bountiful Mazda confirmed metal shavings in the drain trans fluid. 5. No prior warning on car instrumentation, or while driving, or on prior inspection by Cardinaleway Mazda, Gilbert, AZ 6. Neither Mazda USA (Mfr) nor Protective Asset Protection have taken responsibility for the initial equipment failure nor reimbursement through the extended service contract even with extenuating circumstances for late notification. I can provide copies of additional relevant material.

NHTSA complaint #11647521 — an unverified report by a vehicle owner.

POWER TRAIN

Radiators are failing 3 years after the warranty period. Its leading to coolant lost and perhaps overheating the engine.

NHTSA complaint #11627559 — an unverified report by a vehicle owner.

POWER TRAIN

Transmission control module issues. Car was driving on the expressway and wouldn’t shift out of second gear. Engine light and AT light came on. Had to drive slowly on the expressway and get off on the closest exit. Cars were speeding past me and I had to be careful not to get hit. Research and shop shows the 2010 Mazda 3 vehicles have lots of issue with the TCM because they get hot due to there location.

NHTSA complaint #11597856 — an unverified report by a vehicle owner.

POWER TRAIN

Car started jerking and on the way home, the car lost all power to the transmission. The check engine light came on as well as the AT and traction lights. Absolutely no power to the transmission. codes P0780 and P0751.

NHTSA complaint #11596026 — an unverified report by a vehicle owner.

POWER TRAIN

Transmission is pulling during shifting. Dealer updated Transmission software twice already during warranty. Car is doing it again. This can be a safety problem when pulling in front of traffic and Transmission fails to shift smoothly and it jerks/delays.

NHTSA complaint #11590646 — an unverified report by a vehicle owner.

POWER TRAIN

I noticed oil was leaking and my engine was steaming after driving. My mechanic found a crack in a cylinder after watching YouTube and finding out Mazda has this issue.

NHTSA complaint #11580786 — an unverified report by a vehicle owner.

POWER TRAIN

I was driving on the highway in sixth gear and went to down shift to get on to the off ramp and was unable to get it out of sixth gear. I had it towed to the dealer where they were going to charge 4 grand just to tear down the transmission to tell me what might be wrong. So I towed it home and once I was able to get the transmission open, I found the roll pin that connects the shifting shaft to the shift selector plate had worked itself out. If the transmission had been in Neutral, it would have taken less than 20 minutes to fix. But, because it was stuck in gear the whole transmission had to be taken apart.

NHTSA complaint #11570987 — an unverified report by a vehicle owner.

POWER TRAIN

Transmission Control Module malfunction. The AT light came on and the car made a jerking motion and a clunking noise. It lost power and would not shift which is very dangerous in moving traffic. It put me at risk for getting hit by another vehicle not expecting the abrupt change in speed by my vehicle. The check engine light is now lit up. There were no warning lights before the vehicle’s transmission malfunctioned. A code came up on the vehicle when tested. U0101 lost communication with TCM. From what I have read, researched, and have been told this issue is very common for certain years of Mazda 3’s including mine.

NHTSA complaint #11556887 — an unverified report by a vehicle owner.

POWER TRAIN

Transmission control module.

NHTSA complaint #11554582 — an unverified report by a vehicle owner.

POWER TRAIN

The car started to stall, hesitate and even stop completely for no apparent reason. The mechanic first recommended a new ECU/TCU which did not help the problem and in the course of duplicating the problem check engine light has come on for the transmission with problems shifting/sticking in a gear and not returning to first gear. My mechanic has stated that there is a known problem with Mazda3 transmission, and I should reach out to Mazda. They indicate there is no recall, but mechanic provided me TSB reference number 0500814 from a service bulletin. The car is a death trap and I have stalled while driving on the streets and freeway so obviously I can't drive the car. The car is still at the mechanics since parts cannot be found. Please help any way possible. Thank you.

NHTSA complaint #11550320 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2010 Mazda Mazda3. The contact stated while exiting a parking lot, the vehicle failed to accelerate as designed with the power train warning light blinking. The vehicle also started jerking. After the vehicle accelerated, the vehicle started operating normally. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 150,000.

NHTSA complaint #11532289 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2019 Mazda Mazda3. The contact stated while driving 40 MPH, the vehicle lost motive power with the vehicle network malfunction, vehicle inspection”, the check engine warning light and all the safety features were disabled, and the windshield wipers turned on independently. The contact was able to pull over on the side of the road. The contact mentioned that the gear shifter failed to shift out of park(P) and the vehicle was turned off. The vehicle was restarted, and the contact was able to operate the vehicle normally. The vehicle was taken to the dealer for a diagnostic test and stated that no failure was found however, the failure reoccurred. The vehicle was taken back to the dealer and the dealer stated that they were aware of the failure, but the vehicle needed to be diagnosed by a Tech. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was 36,329.

NHTSA complaint #11528488 — an unverified report by a vehicle owner.