Toyota bZ4X

The 12-volt auxiliary battery system repeatedly discharges itself and has twice left the vehicle completely inoperative: 7/24/2026 (5.58 V at the battery, parked unplugged ~46 hours after the last drive) and 7/28/2026 (5.95 V, failure during an attempt to enter READY to drive). The 12V system controls the contactors connecting the high-voltage traction battery to the drive system; when it collapses the vehicle cannot be started or driven even though the traction pack holds charge. The dealer…

The 12 volt battery exhibits a consistent parasitic drain. This is intermittent, but results in the vehicle failing to start. The failure to start is an issue because it is happening frequently and could endanger individuals who live in rural areas or areas with cold or hot climate. This issue has happened to us multiple times and Toyota has not recalled or provided guidance to its dealer service network. Many effected owners have a diagnostic data backed theory that links the drain on the…

There is a foul smell emanating from the window areas of the vehicle after rain. The more rain, the more pronounced the odor. It smells similar to cat urine. I have been able to reproduce it many times, after it rains. I was reading online that the smell is caused by mold/mildew which is a huge safety concern. I had also read that this is somewhat of a common issue caused by the type of weatherstripping in use on the vehicle. When I called the dealership they were unaware of any issues…

The vehicle suffers from an overnight parasitic 12V battery drain caused by a continuous cloud activation/software communication loop involving the Data Communication Module (DCM) and telematics system. The vehicle has gone completely dead and required jumping on three separate occasions. The issue was inspected and documented on a service invoice by an authorized dealership, which confirmed the battery itself tested good and recommended disconnecting the mobile application link due to the DCM…

Vehicle experienced a catastrophic, terminal 12V auxiliary battery parasitic drain that flatlines the system to 0% while parked, creating a severe safety risk by stripping hazard lights and motive power. This is the 3rd identical electrical collapse within 4 weeks; a late June 12V battery replacement failed. The vehicle was in active daily use, not stored.Held out of service at Kings Toyota since July 6, 2026 (26+ days down). Technicians dismantled the cabin and placed the dashboard in the…

I was driving during heavy rain when I heard and felt a big thump. I wasn't sure what happened as I did not hit anything in the road. I was in my neighborhood driving at low speeds (<30mph). When I got home, I realized my fender liners and lower splash guard of my car were missing. I went back out to retrieve these pieces of my car, and it appeared the fender liners and the splash guard got torn off my car without impact with anything, as nothing was in the road near it. I was going to…

Vehicle purchased late March. Since then, the 12V gets completely drained to 0% over the weekend. This is a biweekly problem. Vehicle taken to dealership, they were not able to replicate problem. Dealership claims battery and vehicle perfectly fine. 12V battery continues to get discharged. This issue puts the customer at risk of being stranded on trips. No warning lamps or symptoms before battery dies making vehicle completely inoperable. Research online and owner forums clearly show a large…

I am writing to formally report an unsafe design feature regarding the automatic headlight cleaner/washer system on the 2026 Toyota bZ.The vehicle is programmed to automatically spray windshield washer fluid onto the headlights when the headlights are active and the windshield washer lever is pulled. As a night-shift worker, I frequently operate this vehicle in complete darkness. When the high-pressure fluid sprays over the active headlight lenses, it immediately diffuses the light beam. This…

The 12V battery in my 2026 Toyota bZ unexpectedly went dead, leaving the vehicle completely unresponsive. The vehicle could not be powered on or driven. There was no prior warning. Upon google search, there are several posts on websites like reddit and toyota owner forums with reports of the same exact issue.

Instrument cluster failed to turn on once car is turned on. Speedometer does not display and the electric charge does not display.