Hybrid battery drained to 0 while driving it and now car won't shift

You need to have the OBD2 codes read. There is a long thread on this site discussing the relative merits of various testing devices for this.

Gen2 OBD2 app review | PriusChat

Then report back with that information. In the meantime do not try to go to ready again as it will only further drain the HV pack. Pressing the power button twice (without your foot on the brake!) should be enough to read the codes. If the 12V runs down it is easy to attach a charger to it. Charging the HV pack will require equipment that is hard to come by and/or expensive.

 

If you're driving uphill, it could use more of the hybrid battery. If there is a problem with it, multiple warning lights would come on before it fails. I just think you were probably going uphill and using a lot of the batteries resources and draining it. This could be quite normal due to the age of the battery.

As for it not starting, did you disconnect the orange disconnect plug on the HV battery? When you put it back in, you have to flip it up and then push it downward towards the floor to lock it into place. If you don't lock it into place, the car will not start

 

how fast were you going? was the engine still running when the battery died?

 

I don't see how it could have a problem, unless you're out of gas

The car will throw out 3 or 4 warning lights on your dash if the hybrid battery failed

 

Yes the combination meter problem will often show the HV battery at 1 bar, that is just an electronic issue. So you should address the combination meter first, before anything else.

Without proper dash lights, you won't know your gas level or possibly warning lights (although I think those lights are separate)

 

I think you'll be fine, if the battery drains down to 1 or 2 bars, it'll self charge. A weak battery will charge and discharge much faster than a healthy battery

 

I actually had a similar situation this week with my 2008. My HV battery would not charge properly and I drove about an hour with the battery meter below half way. This is not normal. I went home to find out my engine was the issue and it was misfiring on 1 cylinder. That misfire prevented the engine from charging the battery properly. No warning lights

 

It probably is a continuation of the problem that you created a thread about on June 22th of this year. https://priuschat.com/index.php?posts/3544422
You never updated that thread saying that you got the car fixed.

As suggested in that thread, and in this thread, you need to use a Prius capable scanner to read the trouble codes. All generic scanners available will not read all the trouble codes in a Prius. Spend the money and buy yourself an Autel AP200. It works with an app that you install on your phone. The Autel AP200 is about $60 on Amazon.