Hybrid System Issues

Thank you for the log file. It appears that your scanner is not capable of reporting the P0A80 code, but you somehow reported that you got the code (P3019) for battery block #9 being bad. That is very interesting.

It appears to me that the problem is not the battery ECU, which you already replaced (I am assuming that the file was made after changing the battery ECU), or the wire frame #2 harness which is used for sensing the 14 battery block voltages. The problem is one of the two modules that make up block #9. All the battery blocks are in the 16.8 to 16.9 volt range except for block #9, which is in the 15.4 volt range. It's about 1.5V lower than the other battery blocks.

A Toyota battery module is made up of six 1.2v nominal cells connected in series. So, one of the cells in one of the modules that make up battery block #9 is bad. There are 28 modules (14 blocks) in the complete battery pack.

It is time to fix the hybrid battery. You can try replacing battery modules or replace the complete hybrid battery assembly with a used or new assembly, or maybe it is time to replace the car. You will need to decide what to do. How many miles on the car?