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The subject vehicles are equipped with wheels attached to the vehicle with hub bolts. After low-mileage use, all of the hub bolts on a wheel can loosen to the point where the wheel can detach from the vehicle. The cause of the issue and the driving patterns under which this issue could occur are still under investigation. If a wheel detaches from the vehicle while driving, it could result in a loss of vehicle control, increasing the risk of a crash.
Toyota received a field technical report from the Taiwan market indicating separation of the front left wheel from the vehicle. Toyota recovered the wheels and hub bolts from this vehicle for investigation. Toyota then received two field technical reports from the U.S. market. One of the reports indicated loose hub bolts of the front left wheel and the other indicated a separation of the front left wheel from the vehicle.
Toyota reviewed the production process at the vehicle assembly plant and did not identify any abnormalities on the hub bolt tightening history of these three vehicles. Toyota also reviewed the assembly process of the wheel and hub bolts at the assembly plant and did not identify any abnormalities.
toyota bZ4X : 258
subaru Solterra : 403
Total : 661