My 2014 with 50,500 miles has been at dealer with this warning message since Saturday afternoon. Unlike others who've had the message pop up and they can continue driving, mine appeared when I attempted to start the vehicle and I was not able to start it. We were barely able to get it into Neutral to load it on the flatbed. It was towed to Cabe Toyota in Long Beach, CA. They determined the 12 Volt battery was dead but vehicle generated other error codes that after Toyota Techs reviewed, it was decided a new main battery was needed along with the 12 Volt battery. Driving a 2016 Camry while I await the battery's arrival and installation.