Help!

Bring it to the dealer, might be an inverter issue, which is covered under extended warranty

Did you test the old battery?

 

did you test the new battery?

 

OP, did you try jumping the old battery? If you did, did you make sure that the polarity on the jump cables were correct?

If you did a reverse polarity jump, a new battery will not help you.

 

Well it doesn't quite work like a conventional car......in that the gas engine doesn't really "turn over" to start.
All of the electronics must "come alive" to start and the gas engine "turns over" later as needed.
The key to THAT, however, is the hybrid battery and it's control circuitry because it is the HV battery that actually turns over the gas engine.

So......unless your new battery is not fully charged up (yes it can pass a load test and still have low enough voltage to fail in use) then your original assumption that the 12 V battery was the only problem has likely turned out to be false and you need to have it towed to a dealer for diagnosis.

 

Are you using the Techstream software? The Prius is actually smarter than most code readers and they can't read all the codes it can generate. The Toyota shop (or someone with the right equipment) can find out the voltage and internal resistance of each cell and should be able to tell you exactly what's going on.

 

If it's saying "check hybrid system" it's throwing a code. But you would likely need Techstream (Toyota specific software, on a laptop, with special OBD cable) to read it. Go with post #2. And #10: bring it in to the dealership, get it checked out.

 

It's always difficult to gauge a posters desire, knowledge, experience, and skill in regards to approaching Prius repair issue as a DIY task.
Some want to obtain software, readers, obtain codes, and then go the whole...whatever it takes route.
Which is fine...if you have the desire, knowledge, experience and skill.

My warning would be a Hybrid Battery is a high voltage piece of equipment. Knowing what you are doing when dealing with it...is a safety issue.

If you don't really have the desire, knowledge, experience or skill?
Then my advice is to just not pass GO, and head directly to your Toyota Dealership Service Center and/or a qualified Hybrid Trained Mechanic.

Well, I can understand the frustration if your vehicle is simply NOT working. BUT..
The Prius I think has a well deserved reputation as being a reliable vehicle.
That doesn't mean things don't wear out or break down or fail.
But that reality can happen with a Prius or a Truck.
Yes, you bought a Hybrid, which means it has additional hybrid components as a hybrid machine. And it may or even may NOT be a specific Hybrid Component that has failed... BUT...it didn't break down BECAUSE it's a Hybrid.

PS.
Given your admitted lack of experience with a Hybrid, I'm really recommending just going to a Dealership.

 

Even when there's a good chance that it's a warranty repair, inverter related??

 

I have worked on cars all my life. However I know very little about the prius mechanically. Take it to the dealer. The diagnosis will run about $55 or a little more, you will know what is wrong, and then you can decide options.

 

LOL!
I'm actually scared for you now.
OK...but just remember...the Hybrid Battery is a HIGH VOLTAGE piece of equipment.

In reality and even in metaphor...taking the bull by the horns is rarely a good idea.

Strike That...Taking a Bull By The Horns is NEVER a good idea.

Reconsider the safer Dealership route.

 

I'm not going to talk you into just taking it to a dealership am I?