Checked engine light on /off by itself.

it is usually related to the gas vapor recovery system. the gas cap might be faulty, keep an eye on it if the light comes back.
also, check your oil level

there may be a trouble code set if you have tech stream

 

Whether it's Techstream or some other device, it is always good to have a way to read the diagnostic codes when your car's warning lights come on, so that you can find out why. People on PriusChat can try to guess from hundreds of miles away, but it's just not the same.

 

most definitely

 

Replace hybrid battery pack? Dang…

 

Hybrid pack and abs actuator. That’s to bad both are expensive and difficult to repair.
Brake pedal bad too and does it go ding ding ding like g2?

 

Does the car have a history of any work done on the traction battery?

When the P0A80 is shown as 'permanent', not as current or confirmed, it can be a remembered code from a past battery issue that was repaired.

Permanent codes sometimes stick around for a while. They are not affected by code-clear commands; they only go away when the ECU in question gets convinced from its own monitor testing that the condition is fixed.

The repair manual gives very clear descriptions, for all of the ECM permanent codes, exactly what "confirmation driving pattern" needs to be driven to make the code go away, and there's a Techstream monitor-checking utility to help see when the conditions have been met. But P0A80 isnt an ECM code, it's detected by the battery smart unit and set in the power management control ECU, and there's just not as much information or Techstream support for those.

There is a P0A80 confirmation pattern in the manual, which involves doing a code clear, making a universal trip, then waiting in neutral for the battery SoC to drop to 30%. But I've seen some threads where people were sure they got all those steps right and still the permanent code was there.