Need Help Troubleshooting

welcome!
the hybrid battery is made up of modules. the proceedure is detailed here and in many youtube videos.

you pull the battery and open the case, get an app like dr. prius to test the modules under load and determine the one(s) that are out of balance.
they can be replaced, and balanced along with the whole pack. i wouldn't call it easy, and it is generally not a permanent fix, because other modules are likely to start failing, but there is no way of determining longevity.
the more meticulous you are in balncing, the longer it is likely to last. the same is true if you replace the battery with a commercially refurbished one, but they do all the work and you pay around $700. -$2,000.
the best fix is a new battery, or all new modules.
all the best!

 

A few mistakes here to try to point out as quickly as possible and hope it's in time before you do expensive stuff that's not on point.

1. There is no "hybrid battery warning". If you describe what light did "pop up", we can identify what light it was. Was it the Master Warning Light (triangle)? There are hundreds of reasons that comes on.
2. If your light was accompanied by a "check hybrid system" message, keep in mind that the "hybrid system" refers to the whole complex of interconnected ECUs, electrical, engine, and transmission components that make the car move; it's not a message about the battery.
3. Precisely zero of the codes you've given have anything to do with the hybrid battery.

The Powertrain 3107 code is telling you the power management control ECU is unable to communicate with the airbag ECU. (Well, I don't have a 2013 c repair manual here (more info), but that's what the code would mean in a Gen 3 liftback.) The Body 1000, 1625, and 1635 codes are clearly airbag system malfunctions, which is probably what those other three B codes are also (though my 2010 liftback manual doesn't include those). Any issues with the traction battery would be reported as P codes, not B codes.

A new battery may be the best fix when your problem has anything to do with the battery, but a lot of money to blow when it doesn't.

 

Yep, my first thought was "how old is the 12-volt car battery?" All kinds of strange codes can pop up when she's going bad. Rusty/disconnected grounds can do the same...electrical issues are my least favorite car problems.

 

It's never a bad idea to check the battery voltage (the manual will advise a quick check, and taking time to at least charge it if it's below 11), but the idea of it making strange codes pop up is often overblown on PriusChat.

Most often, it sidetracks people from looking up what codes they have and seeing that they are not strange goofball codes at all. As in this case, where you have an airbag ECU reporting definite codes about its area of responsibility, and a power management ECU also telling you about the airbag ECU.

(Even in cases where low 12 volt supply is triggering codes, those will typically include codes like C1241 or C230x having to do with low supply power, showing again that they aren't popping up randomly, and are telling you just what they mean.)

In this case, because the codes refer to the airbag ECU itself (a/k/a the "center airbag sensor", box low on the floor under the dash) and also to several of the other sensors connected to it, I'd probably start with a good close look at the connections to that center unit, which are common to all of those.

Because that unit is so low on the floor, if there has ever been flooding in the cabin, those connections are prime candidates for getting wet.

 

Maybe it is and maybe it isn't.

Just because it hasn't failed completely doesn't mean that it is completely OK.

IF.....you do not thoroughly test the 12 V battery, it is highly likely that you will be throwing money away trying to fix a "ghost".
If it is the original 12 V battery, you need to find a new one.
That may or may not fix your problem.

 

Yes, not just "most" but all of the codes you have listed pertain to the airbag system; all but one reported by the airbag ECU itself, and the other one reported by the power management control ECU concerning its communication with the airbag ECU.

So your research has gotten you pointed the right direction, after the earlier false starts.

Next, when you look those codes up in your repair manual (more info), you will find the troubleshooting steps that will lead you to the solution.