Hybrid battery and brakes failed on 2006 Prius??

I have a 2006 Prius with just over 200k miles on it. The hybrid battery was replaced about 4 yrs ago with a refurb and it looks like it has failed again. I think this time my husband is going to try and replace the bad cell or cells. My question though is this; the lights went on and the car seemed to be loosing power but then it began to speed up on its own and the brakes wouldn’t stop it ( my daughter was driving it at the time, so this came from her.) She ended up having to press super hard on the brakes and then pulled off to the side of the road and called my husband to come help her. Is this related to the hybrid battery going out or is there more going on here? The error codes are P0A80 (replace hybrid battery) P3014(low power) and P0420 (catalytic converter). The catalytic converters we already knew about.

 

I used the innova code reader from autozone. I didn’t dare drive it to the dealership. Thanks for the advice.

 

I have checked the recalls when the catalytic code started popping up and didn’t find anything. I bought the car in 2016 and was told it had a refurb battery with a one year warranty. It lasted four years and about 50k miles. I thought that was pretty good but maybe it was a hodgepodge set. I don’t know much about the car before I bought it. My husband went and drove the car home and said it was accelerating on its own briefly and the brakes were very stiff. Then lost power and drove slowly the rest of the way home. Hybrid battery bar at 1. I don’t know a lot about the regenerative breaking system but thought the battery going out could cause the acceleration and stiff breaks. I’ve searched the internet and didn’t find much about it. I might have to take it into a Toyota mechanic and see what they say but wanted to check here first.

 

Typo on my first post. The hybrid was relaxed 4 yrs ago not 4 hrs ago. Sorry for the confusion. Not sure if I can go back and edit that but I will try.

 

So...my first post has a typo. The hybrid was replaced with a refurb 4 YEARS AGO not 4 hrs ago. I was wondering why everyone was asking me who replaced it and about the warranty. Sorry.

 

This is all great advice. I did buy the Carista obd2 for my 2012 Prius so I could adjust the reverse beeping and a few other settings but I couldn’t get it to work. It just caused all my warning lights to go on and an error code. I ended up returning it to amazon. Maybe I’ll give one another try. Thanks for the link. I will post again when I have more info. I’ve only posted once on this chat so thanks for all your help and for everyone overlooking the many mistakes I am surely making.

 

Update: my husband did some research and ended up replacing the bad cell yesterday. He tested all cells and they are all in the 7.7 range. We reinstalled the battery last night but can’t get the engine to fire up or the car to shift into drive or reverse (only park and neutral). Yes we are pressing the brake when shifting, all doors are closed and the orange hybrid battery safety plug is completely inserted and clipped down. Any idea why it won’t shift? We disconnected the 12v and reconnected it. Tested the voltage on it and it seems fine. All warning lights are still on including the brake light which I find suspicious since my daughter claims she was having trouble with the brakes when all this started. However, when we left the car in neutral and he pushed it to get it rolling, the brakes worked just fine. We are planning on taking the battery back out and double checking all connections tonight. Any additional advice we can get before then would be great. Thanks.

 

Good news! We took the battery out, checked all the connections and then put it back in and it started up and drove great. Cleared the codes by disconnecting the 12 volt and all seems well. Not sure what we missed the first time around, but I am thrilled we just repaired her hybrid battery for $35. Thanks for all of your help!!!