Can a bad 12v Aux Battery throw a P0AA6 613 code?

It is unlikely that the 12V battery is at fault here. However if you are worried about the battery charge level, charge up the battery prior to your testing, and leave a 10A charger on the battery while you are doing your testing with the Prius IG-ON. (Disconnect the charger before you try to make the Prius READY.)

Either the transaxle or the inverter has a ground fault. Most likely the transaxle is at fault. As you've already learned, you can get one start out of the car after disconnecting the 12V battery. Hence, that is a workaround which will allow you to defer repairs.

You might try disconnecting the high voltage cabling from the inverter to the transaxle. The factory repair manual suggests using a megohmmeter to test resistance from the transaxle stator windings to body ground, for both MG1 and MG2. If you get resistance readings lower than infinity, that shows the transaxle is at fault. (The spec is 10M ohms or greater.)

If you don't want to buy a megohmmeter, you might try disconnecting the cabling and using a regular ohmmeter. If the ground fault is bad enough, a regular ohmmeter will show low resistance readings.

Another possibility is to disconnect the cabling, then power up the car to see if the ground fault goes away. If it does, that is proof that the transaxle is the culprit. Of course you should plan that other DTC will be logged, associated with the transaxle being disconnected. Obviously you need to be careful not to zap yourself in the process, and you need to look out for the interlock switch on the inverter, which is closed when the cover is installed.

I suggest you consult the factory repair manual info at techinfo.toyota.com

Incidentally, it appears that your tire air pressure is low on two tires.

 

I suggest that the Optima is no better than other major brands and there have been several time periods recently when they have had a high failure rate.

 

Toyota.

If price is important, check auto parts stores.
Just be sure that it is an EXACT replacement.
Slightly different sizes and post configurations can cause problems with installation.

 

Most of the time you get what you pay for (cheap).

IF......saving $10 is really not that important right now, you might want to reconsider that.

 

Keep in mind that Suzy's 12v Toyota battery was replaced just outside of the 1 year warranty. Sometimes one gets what one pays for. Sometimes one gets less.

The battery Liberty Toyota sold me in 2009 didn't last 3 months. It doesn't sound like Toyota's quality has improved.

I'd find a battery with a longer warranty and have it delivered to me but to each their own.

 

You have a transaxle issue that's covered by a Toyota TSB, maybe you can contact Toyota and ask them to cover this repair? Not sure of your mileage, but you can always try and ask

TSB attached

 

Call the 1800 Toyota corporate number and ask them for a goodwill warranty assistance

 

You need to remove the inverter cover after disconnecting the HV battery interlock.

There are six orange cables connecting the inverter to the transaxle, those are what we are talking about.

 

Did you ever make a video for this, if so, could you provide the link? Im going to probably have to do this swap soon as well. :/

 

4 year old post. And your posting in the G2 forum. Your 2010 is a. G3.

use the search forums link up top and search away. Search transmission removal. Trans swap. Etc.

many trans and motors replaced on this site. I have heard it is easier to pull the trans and motor as one.