2012 Toyota Prius Owners Manual - Page 849

5 -2 . St e ps t o t a k e in a n e m e rge nc y I f your ve hicle ove rhe at s The following may indicate that your vehicle is overheating: ● The high coolant temperature warning light flashes or comes on: The engine may be overheating. ● "HYBRID SYSTEM OVERHEAT" is shown on the multi-information display: The power control unit may be overheating. Follow the correction procedure as described below. Correction procedures