Prius won’t go into ready mode

And of course there are no codes no codes stored in memory everything is just blank slate? Correct?

 

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When you say "nothing", does that mean that every time you try to ready the car, the PRNDL flashes and you hear a fan running?

I would want to scan all of the systems on the car to see what codes are present.

Here is a thread that reviews several scantool apps & devices.
https://priuschat.com/index.php?posts/3290690

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The hybrid control module is a darned important module in the car (the orchestra conductor for everything else, pretty much), and a code about something unable to communicate with it may well come along with important things not happening.

If that communication problem is intermittent, then stuff may well work great (and the code will be gone), when there isn't the communication problem.

With U codes, it's extra important to know which ECU in the car has reported the code. The code itself means "hey! I can't communicate with the hybrid control module!", but it also matters which ECU is saying that. When you also know that, you can start looking at the network diagram in the repair manual to start pinning down where a communication issue could be, between those two things.

Some scan tools tell you which ECUs reported which codes, and others just show you a big glommed-together list of codes. If you've got the kind that just gloms them together, it might be time to upgrade.

 

11 to 14, depending on the trim level.

This thread does a comparison of a few scanners that work with the Prius from basic functions to comprehensive.

 

There are 15 to 16 "systems" on a Gen2 Prius that can talk to a scantool. Most have a dedicated ecu. A few aren't really separate ecu's- for example cruise control is just a function of the hybrid control ecu (which talks to other ecu's to get the job done).

And there are a couple ecu's that don't talk to a scantool - such as the Combination Meter (speedo).

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Sounds like a crock of doggy doo to me. Or your car is a flood car you keep 4 inches of water in the floorboards of your car because well you're the crocodile hunter or something? But yeah I guess you could start lifting out seats and checking joints and t joints and all those wire looms I don't know how they would even come up with a diagnosis like this without undoing looms to have a look they're just guessing by shooting voltage and using ohms measurements and what have you I doubt it this is when I would expect people like Chapman to come along and maybe give some insight to this I have seen dealerships talk like this but when they're put to the test or the task they fail miserably so they're asking $9,000 to fix this I don't even know what model car 2008 Ford all the way to say 2013 nobody would do that that's more than vehicles worth . There are too many to buy and just put my stuff on them. $9,000 I could go out and buy five of them in the morning like.

 

Clearly the Greentec guys screwed it up with their “reconditioned” (used) battery and subsequent ecu parts cannon. And then they apparently gave up, sop for the typical used battery guys.

The dealer is probably seeing some repair attempts, probably by the guys above.

Maybe if they simply used butt joints or the old twisted strands and tape technique.

But I doubt it. It would be helpful to know which ecu they replaced and better yet if you have the original one. Most likely the hv battery is bad and too many cooks in the kitchen has added problems.

 

Get a bootleg copy of techstream. ebay/amazon under mini vci cable. if you're paranoid also get a cheap used laptop to run it on. expect a learning curve.

 

did you ever properly pull all the codes?