Left my Prius in the garage (2 Months!..)

It is not a special mode.
It is simply the way the car operates.

 

And the drive train isn't even remotely like a conventional car.

 

How does the car respond when doing this procedure ?

Power being applied and the brakes are trying to hold it still ?

 

With my C, exactly nothing happens.

When the car "knows" that it can't go anywhere......like if it is in PARK or if the brakes are applied.....pushing on the "gas pedal" results in NOTHING.

 

If my memory serves (which is not assured), your 2012 was built after the 'Sudden Unintended Acceleration' or 'Runaway Toyota' fiasco, so may have an upgraded brake-throttle lockout help prevent those purported incidents. Those events were mostly driver error, with some cases of mechanical interference thrown in, but there is no certainty that none of them were drive-by-wire control faults.

OP's 2010 was built before that change, so has only a partial throttle defeat.

 

I don't know what you guys are talking about-- I tried this once on my 2010, and all that happened was the car tried to fight against the breaks and go...

 

My mistake. I had it in my head that this was a gen 2.

 

It does work on turd gen, the guy with grocery stickers on driver door does this as he's at the starting line of racing.

 

It stays stationary.

What happens mechnically? There are 3 inputs to the "gearbox" and one output. Inputs are the Internal Combustion Engine, MG1 and MG2, the output obviously are the wheels. MG2 has a fixed relation with the output to the wheels, so when stationary, MG2 will not spin. That means when the ICE is running, MG1 has to start spinning. It will do this with a relation of about 3.6:1 to the rpm of the ICE and should max out at 10,000 rpm (which is 2,778 rpm for the ICE).

 

It's definitely a thing.
Great for burnouts with muscle cars.

 

You actually do this to customer's cars ?

 

Muscle car Prius?
You mean this one?
Hellcat-Powered Prius

 

We have two Prisus'. One is stored in Florida through the summer for six months (no AC) and the other is stored in Kentucky for six months during the winter. Both vehicles were stored with relatively full HV batteries. A maintainer is connected to the 12-volt batteries. We've been storing one of them every six months since 2010, and the other for the past two summers. The only problems we've had were the 12-volt battery failing (while on the maintainer) and engine knock when the Kentucky Prius engine starts in the spring.