Does this sound like evidence of two bad modules?

The voltage of module 1 and 14 appears normal. If you had a blown cell in either module it would be a full 1.2v less like 14.90.

Also, I had the hybrid battery fail in both my Prius and the cars were going to Ready without issues. Start by researching the codes first before you dismantle the battery.

 

Keep us posted what you will find. I am sure you realize that in your particular case with a high voltage leak you should be extremely careful when you work on the battery.

 

Why are you starting a new thread for the same problem? Don't do that it will only create confusion for both you and people trying to help you.

The other thread has good information you should go with and just stay with that thread too.

And to answer your thread title, no, it doesn't.

 

I agree that you cannot make a conclusion about which modules might be in need of replacement based on your single snapshot. A log of block voltages from Torque Pro or a graph from Hybrid Assistant over the course of a 15 or 20 minute road trip would be more conclusive. Your difference of .34V between the lowest voltage block and the highest voltage block is just above the .3V that might trigger a code for an out of balance condition in your battery's modules, but I believe the code will not be thrown unless the difference is consistently above .3V, which cannot be proven based on one screen shot. Further, the pattern of the outer blocks (1 and 14) having a lower voltage that the others is the same as I have seen on our Gen 2 after it has been sitting idle for a few days, and the same as others have reported. It seems that having only one adjacent module rather than the normal 2 allows the outer modules to discharge at a slightly higher rate. I have seen this pattern in our car for the 4 years we have owned it and it has yet to throw a code.

It is not likely that you will be able to identify the leaking module(s) on the basis of its (their) voltage readings alone. The leak is probably slow enough that natural variability of voltages between the modules will disguise the leaking one(s). In fact, the modules may not be leaking at all. The repair manual describes the Detection Condition for P0AA6-612 as follows:

Insulation
resistance of
HV battery,
battery ECU,
system main
relay, or system
main resistor is
low.

The Trouble Area is described as follows:

- HV battery
assembly
- Battery ECU
- System main
relay
- System main
resistor
- Main battery
cable
- No. 2 main
battery cable
- Battery plug
- No. 2 frame
wire
- Junction block.

So your first task is to verify that the leak is coming from the modules themselves (HV battery assembly), rather than the other trouble areas listed. To do that you do not even need to take the battery out of the car, as shown in the 2nd video of @strawbrad's Post #12 in this thread.

Try that first and let us know how it goes before digging deeper into what is causing your car's issues.

 

Not necessarily. With this particular code battery modules can and often do behave perfectly normally with regard to voltage and capacity.

The sub-code 612 (see screenshot in the first post) serves the same purpose and is more reliable.

This was also covered in the other thread, BTW.

 

Right, I was not saying that would help to find a leaking module, only that it might help to identify a weak one.