2012 Toyota Prius Owners Manual - Page 816
2012 Toyota Prius Manual
Page 816 highlights
5-2. Steps to take in an emergency Warning message Details EV drive mode has been automatically canceled. A buzzer also sounds. The reason why EV drive mode cannot be used is shown on the second line (may not be shown in some instances.) Correction procedure Drive normally for a short time. (Flashes 3 times)
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