Toyota is expanding a recall from 2018 on certain Prius models that can stall while driving, according to paperwork filed with the NHTSA last week.

A transistor in the power module can fail when accelerating quickly and cause the hybrid system to shut down, which may cause the vehicle to stall and increase the risk of a crash. Repeated hard driving could cause more thermal stress on the transistors. When those transistors fail it can generate voltage higher than limits set by engineers. Exceeding that limit should trigger a failsafe mode that enables drivers to operate the car for certain distances. Instead, in the case of the recalled Prius, the system shuts down. Steering and braking are still operable, however. Drivers may be warned by warning lights and a warning message in the instrument panel.

The recall affects 266,638 models, including the 2013-2015 Prius and…

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