Toyota bZ4X Problems — All Years, Common Issues & Reliability

While driving on the highway under normal conditions with no road hazards present, the engine under cover (part #51441-42210) detached from my vehicle and the bumper clips broke, causing both the under cover and bumper to become damaged and requiring replacement. There was no collision, no debris, no pothole, or any other road hazard involved. The failure occurred solely under routine highway driving conditions. Upon taking the vehicle to my Toyota dealership, the service team acknowledged this is a known and recurring issue with the bZ4X model. Research and owner forums confirm multiple 2023 bZ4X owners have experienced the identical failure — undercarriage cover and bumper detachment under normal driving and rain conditions. Toyota dealers have repeatedly told affected owners ‘this happens all the time,’ yet Toyota refuses to cover repairs under warranty, claiming it is not a manufacturing defect. I believe this represents a systematic design or manufacturing defect in the 2023 Toyota bZ4X. The undercarriage cover and bumper mounting system fails under normal driving conditions, which poses a safety risk to the driver and other vehicles on the road. I am requesting a formal investigation into this issue and urge NHTSA to consider a recall to protect other bZ4X owners.

The contact owns a 2023 Toyota BZ4X. The contact stated that the vehicle was awaiting a recall repair. The dealer informed the contact that the electrical HVAC compressor needed to be replaced as part of the recall repair; however, the part was on back order. The vehicle was taken to the dealer, but the recall repair was not completed. The manufacturer was notified of the failure. The approximate failure mileage was 117,000.

The contact owns a 2023 Toyota BZ4X. The contact had attempted to use the defroster; however, the blower was not blowing hot air onto the windshield. The contact had received notification of NHTSA Campaign Number: 25V577000 (Visibility); however, when the dealer was contacted to schedule a recall repair, the contact was informed that the part to do the recall repair was on national back order. The contact called another dealer and the manufacturer, and was informed by both that the part was on national back order. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The failure mileage was approximately 55,000.

The contact owns a 2023 Toyota BZ4X equipped with Goodyear Tires, Tire Line: Electric Drive 2, Tire Size: 215/50/R20, DOT Number: (N/A). The contact stated that while driving at various speeds above 50 MPH, the vehicle experienced severe shaking and abnormal vibration. The vehicle was taken to the local service center who determined that the foam pad inside the tire had malfunctioned. The foam was replaced, and the tires were balanced, but later the same failure reoccurred on the rear passenger’s side tire. The vehicle was taken to the local dealer for repair. No further information was available. The manufacturer was not notified of the failure. The failure mileage was unknown. The VIN was not available.

While driving the road was wet the vehicle brake failure and the steering wheels stopped completely lost control of the vehicle and keep running over the curb and hit moving vehicle

I just bought the toyota bz4x about 2 weeks run 1000 miles start knocking noise rear wheels, and then I brought to dealer ship , they can not repair , they told me to wait for corperate call, but right now knocking sound get in more, I want to recall, because I want get refund

toyota bz4x 2025 ran 600 miles ony knocking noise over un road more so from the rear wheels driving 10 MPH

a client states there is a knocking noise over un road more so from the rear wheels driving @ 10 MPH believes more so R/R wheel . they already fix two time , but still more knoking soung, the dealership service can not fix

I LEASED A TOYOTA BZ4X THE PARKING BRAKE LIGHTS AND OTHER LIGHTS COME ON AND OFF WHILE I AM DRIVING AND FOB IS NOT TOUCHED. I TOOK CAR IN TO BE SERVICE FOR REGULAR MAINTENANCE AND WAS TOLD I HAD TO PAY $295 AND I AM UNDER WARRANTY. I WAS SOLD THE CAR BRAND NEW AND I DON'T THINK IT IS. I KEEP HEARING PEOPLE TALKING WHEN THE CAR IS POWERED OFF. I REPORTED THIS SEVERAL TIMES AND WAS IGNORED. MY CAR KEEPS TRYING TO CUT OFF WHILE I AM DRIVING AND THE CAR STARTS SHAKING, ALL THE LIGHTS COME ON THEN GO OFF. I WAS TOLD I COULD GET MY CAR SERVICE ANYWHERE FOR NO CHARGE UNDER WARRANTY. I WAS TURNED AWAY. ITS N BEEN A YEAR AND NO SERVICE CAR HAS NOT BEEN SERVICED AT ALL. I TOOK IT 2 TIMES FOR SERVICE AND THE CAR HAS NOT BEEN SERVICE. IT IS SUPPOSED TO BE NEW.

The vehicle experienced repeated electrical and brake system malfunctions that pose serious safety concerns. On multiple occasions, the brake pedal became stiff and unresponsive while driving, and the parking brake system failed to engage properly. In addition, the ignition system often failed to start, even when the battery and all power indicators appeared normal. At times, the vehicle’s electrical system completely shut down without warning — causing loss of power functions, dashboard lights, and essential safety controls. These failures occur intermittently and unpredictably, making the vehicle unreliable and unsafe to operate. The issue has been reported to the dealer for inspection, but the problem continues to occur. It appears to be related to the vehicle’s electronic brake control and ignition system. This malfunction places the driver and others at potential risk, especially if the brake system or electrical components fail while the vehicle is in motion.

I am writing to formally report ongoing issues with my Toyota bZ4X that raise serious safety concerns. The vehicle has been inspected twice by authorized Toyota service centers, and each time I have been told that no problems were found. However, the following issues continue to persist:     1.    Inaccurate Battery Readings: The electric system appears to malfunction regularly. The displayed battery percentage and estimated mileage are inconsistent and unreliable. For example, the battery may indicate a higher percentage while simultaneously showing a drastically reduced range, or vice versa.     2.    Lane Departure Warning Malfunction: The lane departure system activates erratically, sometimes without any lane deviation. At other times, it fails to engage when it should, which compromises the vehicle’s safety features.     3.    Tire Pressure Monitoring System (TPMS) Alerts: Warning lights frequently come on indicating that the tires are losing pressure, even after verifying that tire pressures are within recommended levels. These warnings occur unpredictably and without cause. Despite having the vehicle inspected twice, I have not received a resolution or acknowledgment of any defects. Toyota has stated that nothing is wrong with the vehicle, but the issues are ongoing and continue to impact the car’s drivability and safety. These problems are not only frustrating but also present a potential risk while driving. I am requesting that Toyota take this matter seriously, investigate the root cause of these electrical system malfunctions, and provide a resolution that ensures the vehicle operates safely and reliably.

Premature and abnormal tire wear on my 2023 Toyota bZ4X, confirmed by two independent tire shops, despite consistent Toyota dealer maintenance every 6,000 miles. Beaverton Toyota dealer dismissed the condition as “normal,” but both [XXX] and Discount Tire documented unsafe tire wear caused by alignment. --- Details of Problem: Vehicle serviced exclusively at Toyota dealer (Beaverton Toyota, OR) every 6,000 miles, with multipoint inspections and rotations. On 9/22/25, Toyota dealer inspected the vehicle and reported that alignment and tires were “normal.” On 9/25/25, [XXX] inspected the vehicle and documented severe outside shoulder wear on the right-side tires. They recommended immediate tire replacement for safety. Alignment was also adjusted at that time to bring values into balance (report attached). On 9/27/25, Discount Tire replaced all four tires at 27,562 miles. Their written notes confirm edges were worn on all four tires due to alignment (right side more prominent). They declared the tires unsafe for continued use and recommended full replacement. Safety Concern: This abnormal alignment-related wear created unsafe driving conditions well before the rated tire life (55,000 miles). Uneven edge wear and shoulder failure increase the risk of blowouts, hydroplaning, or sudden loss of control. Attachments available: Toyota dealer report stating “normal” Les Schwab alignment printout and written safety note Discount Tire invoice with technician safety comments Tire photos (all four corners) Full Toyota dealer service history INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)