I had my Prius check out and gave me these trouble codes couples battery's low he has a red triangle P0A78?? P3000 P0A80 P03014 P0315 The battery's rating 13.5 volts Will always trouble codes go away after replacing the battery I added inverter to it because it was it was dying after 50 miles per hour then it slowed down??
The battery codes are about your HV (Traction) battery, not the 12v battery. There are many threads discussing your repair options, but it does run into the low 3 figures ($) to do a repair. 13.5v is when the 12v battery is charging; to tell if the 12v battery is still good, you need to test the resting voltage (when the Prius charging circuit is not active - it should be about 12.5v - more if the battery is new) and under load (again with the charging circuit inactive - it should stay above 12v). JeffD
