Join Date: May 2014
Location: N. Central Florida
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It is possible that your aux. 12 V battery is just going bad; let's hope that's all it is.
Places like Auto Zone will test that battery for you.
You probably need to visit a qualified hybrid shop......like a Toyota dealer.
There isn't much you can do to diagnose the problem yourself.
At the very least, you need a digital multi-meter ($20 or less) and a "code reader" which runs $100 or less.
For most people, it's better to just take it in.
'17 Prius C-4