check Hybrid System light came on 2010 Prius. If I take it to AutoZone will they be able to tell me what's wrong using their code reader?
I would take it to a Toyota dealership; they'll likely charge (somewhere between $50 and $100) for diagnostic, but they have the proprietary Techstream, have better odds of full/accurate diagnostic, and if there's a need for remedial work, it'd be one stop shopping.