Prius 2012 coolant disappearing but no leak

Hello, first, I'd have your check engine light looked at to see what is causing that. This will give valuable information that may or may not relate to the engine coolant loss issue. Always focus on what you know to be happening and in error before you speculate about the things that have no other clues. https://repairpal.com/repair-shops/toyota-repair-and-service-in-pittsburg-california