2010 no start with good 12V

Okay and when you clear the codes with the funny scanner that you have are you clearing the codes twice hitting the red or green or whatever color the code clear button is you hit it once it tells you all the codes are clear even that there wasn't any codes and then you hit the button again and it tells you code clearing or code erasure was successful like it did the first time and now the car readys? If this is the case usually what you have going on there with that particular vehicle you just done this to is the hybrid isolation fault that means there's some crap dripping out of your battery modules onto the tray generally speaking it can be other ways too but this is the most common. So you need to get a scanner even if you can just borrow it so you can get the code for the hybrid isolation vault and it's three digit subcode when you come back with the code and the three digit subcode that will tell you where your problem is for the most part If you don't want to do that don't have that can't make that happen lift up the plastic tray in the back look at your battery take the 10 mm screws out of the silver tray lift up the tray and look carefully all around the battery the under tray and all of it with a flashlight You should see telltale signs of leaking electrolyte type fluid stains on the underpan underneath the modules excessive calcification and build up on your bus bars and nuts which are under the black covers that the orange holders hold to the battery modules You can't miss this stuff there's plenty of pictures here of all the stuff you don't want to see you'll be looking at the same thing All that needs to be cleaned up straightened out what have you now I'll pull the safety plug undo the orange wires off the relays undo all the plugs that have everything going to stuff in the trunk and take that battery out of there to disconnect all those little nuts and screws and bolts so I can clean all that nonsense up It's a big pain in the rear or you pay somebody to do it either way pretty easy stuff safety plug out battery removed all bus bars and nuts and stuff taken off put in a pile all of that metal can go in the kids rock tumbler with the right media and it'll be brand new in 8 minutes and then follow the instructions here on the site is what to do after you get everything cleaned primed and ready to reassemble.

 

You need a better scanner tool to check for trouble codes. Take a look at post #37 this tread: https://priuschat.com/index.php?posts/3290690
The Autel AP200 is a good choice, and the price is about $60 on Amazon.

The description that you gave leads me to guess that you have a P0AA6 high voltage isolation fault. Do not jump to conclusions until you can retrieve all the trouble codes from the car.

 

If your friend is using the Toyota Techstream scanner, you will be able to read all the trouble codes. If your friend is using some other scanner, maybe not. Find out what scanner he is using.

Out of curiosity, how many miles on the car?

 

yeah, it's not the quality or price of the scanner. it simply has to be capable of reading all the prius ecu's. not many can, hopefully, your friend has toyota tech stream.