2007 Prius. Hybrid battery (original) failing...

It sounds like they didn't actually read the codes supplied by the car. They're guessing. You need to find someone who can actually read hybrid codes. THAT is your number one priority.

Sounds to me like possible your inverter cooling water pump failed. This causes the inverter electronics to overheat and the car will protect itself by killing the AC and power to the transaxle. Pull over, turn it off, let it sit for a few minutes, it cools and allows you to drive again, for a short bit, then heats up again.

Go pick up the car, but leave the AC off and stay under 35mph. This usually allows you to drive many miles before it gets hot. See if it works.

I didn't see the part where you mentioned the brake light being on. Probably not the ICWP. BUT, you still need actual codes, not guesswork.

 

The 2nd generation prius is very reliable. But there are 2 failures that are pretty much guaranteed. The brake actuator/accumulator pump and the HV battery. Seems you hit one of the failures and the brake failure won't be too far behind. Both of these are high ticket items. So if you decide to fix the battery (let's say the current price is $2500 for a new one), prepare yourself for another $2500 for the brake actuator that will follow. If you're not willing to spend that type of money, best you just sell the car now.

I use to help install these batteries and brake actuators, but I've since taught a nice apprentice to do this work. If you would like someone to go to you and install these items (you purchase them through the dealership), he can do it at a very low price, compared to a shop.

 

My friends lil daughter could change the hybrid battery with a piece of plywood avail on side o road in lots places but yeah it's like 87 pounds. When you starting stopping going 50 feet . Did maybe try n turn power rubbing devices off possibly it's a long shot I know . But it's a thing . Yeah and o7 w original being tested on the heat will bring it down quickly . And make it time.

 

So before 3K on a real battery . Is really time to think is this model really needed her or? 3K can put you in a nice Yaris that requires none these antics . Near similar mpg . Seriously.

 

Can you scan and post the actual error codes? How many miles on it.

I bought the 2009 model year last year with 147k from a dealer 55 miles away from home. While driving back home, all the lights came on, A/C quit. I was almost half way. Just drove back. Other than the A/C, i didn't feel much difference. Came home, scanned it and it was the Inverter coolant pump. Once replaced (OEM), everything is fine. Then the actuator which was making noise every few seconds, i just replaced it proactively. $1300 later, that is also fixed.

I think OEM battery is like $1.7K at dealership. There are lots of aftermarket options. Some of them come to your home and fix it.

Regarding scanner, i used Autel MaxAP200. It also have special functions to bleed the brakes after actuator replacement. Something like this -> Autel AP200 OBD2 Scanner Bluetooth - Full System Diagnostic Tool, 19 Reset Functions, AutoVIN, Check Engine Code Reader for iPhone/Android - Walmart.com

 

If the owner of the prius had scanned the codes in the first place and used the search on this site, I think he would not even have had to start a new thread... about guessing.