2009 Prius won't turn on, jumpstarts from 12v but doesn't stay on or go to 'Ready' mode

Update: The batteries have been replaced and it starts up and into 'Ready' mode now and goes into D and R like normal. I still however have a U0100 code, the fuel gauge just flashes between no gas and a full tank (i have just over half a tank of gas), and the red triangle/vsc/etc dash lights are still on. Any thoughts?

Edit: I also tested the original AM2 fuse and it also is fine so I'm not so sure it's the inverter coolant pump. I can also only accelerate to about 5-7mph. I've tried resetting the fuel gauge to no results as well.

 

I'm confident the scanner was definitely fluent in Prius. This time it was scanned by a technician specifically equipped for dealing with them

That being said yeah I wouldn't be surprised if it's more than that but it's the only code it threw

 

Alright yeah I just tried to start it again and it now no longer goes into Ready mode nor displays the speedometer and only goes into P and N I knew that it charged as it drove but I didn't realize I was supposed to let it sit in Ready mode idle for awhile. Really am learning a lot about this car over this process.

I definitely need one anyways for the future so I'm going to do research and buy a decent smart battery charger tomorrow for peace of mind

 

Going to try getting it scanned once more by another scanner that I'm certain should be able to communicate with it. It still isn't going into Ready mode and I tried filling the gas tank with no luck. When I press power twice twice without my foot on the brake the diagnostic screen on the dash displays problem and the battery icon is on one bar if that helps narrow anything down (again, I just got both batteries replaced yesterday and i'm not sure why replacing them let it *kind of* work just to stop working again. at least i have power in general to work with now but this really sucks.)

If this keeps up I know it's gonna come down to "just take it to a shop" but I don't know how costly it will be so I'm hoping still it's something I can handle on my own.

 

Yes, both the 12V and the HV. I got a new 12V and the new hybrid battery is refurbished but should be perfectly fine. My car was acting exactly like when I'd jump it with my old batteries as well. I actually didn't know it was even possible to charge the HV battery without just driving the car?

 

so on a whim after seeing a thread where someone experienced exactly what I am dealing with I tried again on a whim to replace both the EFI and AM2 fuses with the inverter coolant pump cable disconnected and the 12V disconnected and then plugged the 12V back in.

now my car consistently goes into Ready Mode and the battery reading is at a normal level on the diagnostics screen however the engine after a moment of the car starting into ready mode starts making a loud noise and the car is emitting some smell

would that kind of thing be caused by a lack of an inverter coolant pump or could there maybe be more to this?

it's worth mentioning before all this happened I had the issue of having my cat cut out last year and I got it and the O2 sensors replaced just days before this whole problem began. I didn't mention it before because I really didn't think it to be related but after seeing that also happened in the thread I mentioned I figured that might be related?

EDIT: ok so I plugged the inverter pump back in actually since I have spare fuses and I wanted to see if it would blow them and to my surprise it actually moves and even smoothly goes in reverse but if I start accelerating forward I can reach a max of only about 30mph (drove in a circle around my neighborhood) but the engine makes loud noise and acceleration feels less than good.

 

I've now test driven it a bit and it's starting to feel better about its handling. I'm starting to believe the culprit may have been a badly installed or outright faulty O2 sensor that shorted and blew the EFI fuse because it's working exactly as it did right before it died months ago it's just got a bad start (engine noises and jerky/uncomfortable/loud/slow acceleration and the only trouble light on is the check engine light.

After a bunch of googling, my exact remaining problems fit what's described by a bad O2 sensor. I'm of course going to see if I can get codes again but maybe this might be useful information for people having similar problems after dealing with cat+O2 theft

 

SOLVED: Got it to O'Reilly's to get scanned. Only code it's throwing now is bad O2 sensor that was it. Hope this thread helps someone else!