Took the Prius to the dealership because I was getting codes on my screen. They wanted $7,000 to replace the High Voltage battery pack. They reset the codes and sent me on my way.
Codes showed back up again. Took the car into Gary Stolz Automotive and they diagnosed the codes and found that this combination of High Voltage pack error codes is actually caused by the 12 volt battery failing. Sure enough my 12-volt battery was measuring at 11 volts.
Replaced the battery and the problem is now solved.
By the way, the shop is now owned by the two mechanics. Gary Stolz retired. The shop is in the same location but is now called Automotive Artistry.
Went in for a tune up and was told everything looked good still except the spark plugs. The squeaky brakes were just squeaky and they applied some sort of lubricant to them. Any other shop would have sold me an entire tune up and new brakes! Very honest and nice guys at this shop