Yahoo Autos 2021 Toyota RAV4 Prime recalled for potential stalling in cold weather
Toyota is recalling 16,679 units of the 2021 RAV4 Prime plug-in hybrid over a software logic problem that can potentially occur in narrow circumstances. The Hybrid Vehicle Control ECU (HEV ECU) contains programming managing parameters for the high-voltage hybrid battery that ensures safe running and protects the battery. It's been found that when a driver's been in EV Mode in cold temperatures and pushes the throttle pedal quickly, the battery voltage can plummet below a safety threshold. If that happens, the vehicle will display a warning message before shutting down the hybrid system, which shuts down the vehicle. If this occurs at higher speeds, the occupants face increased risk of a crash.
Toyota's Defect Report filed with the National Highway Traffic Safety Administration notes that the first reported instance of the event came from Europe in March 2022. While every one of the recalled vehicles has the software in question, not all of the vehicles were sold in the U.S. Also, no other Toyota or Lexus product uses the same HEV ECUs. Only five warranty claims have been filed in the U.S. since the initial report, Toyota saying the recall decision came when it "concluded that voltage reduction due to hybrid battery deterioration over time could contribute to further occurrences."