Need help!! Red Triangle

What scan tool or app did you use? Your scanner is not good enough to read the trouble codes that triggered the red triangle (master warning light). You need to use a better scan tool.

 

Sounds like you may have the HV isolation fault which lots of scanners will not pick that up unless it's a very new scanner with all the codes in it for hybrid vehicles this wouldn't happen in a regular car I'm not saying that's the code you have but it sounds like that that's partially possibly going on so you need to scan tool that can read all the codes that a Prius can throw out your best deal for that is a thing called an AP200 It's the best $63 you'll spend to deal with this vehicle forget the vent shades and the funny shaped air fresheners by this tool It would be a smart move If not you're going to be playing guessing games and wasting lots of money way more than the $63 that this tool will cost you You should get on that right away so you're not peeing in the dark on your own foot possibly.