Prius wont go into drive

welcome!
check the inverter pump. did the speedo come back on with the reset? did you test the 12v or hybrid battery?

 

Welcome to PriusChat !!

What were those DTCs that you erased ?

It would be quite helpful if you could post the codes here.

 

You have a high voltage leak. It's the only code that causes no driving problems until the car is shut off. Then It will not restart. Clearing the code allows the car to again drive normally until the error is detected again. Then you are back to the no restart condition.

The car seller was most likely aware of this problem.

 

Check the inverter coolant level and the inverter pump for operation, if you can't hear the pump or visually discern liquid movement, then take a finger or a pencil/stick/rod and touch the inverter pump housing to sense any working vibration : P0a93 engine code | PriusChat

Here is the workup for DTC P0A93 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21bpm/0a93346.pdf

 

After the dash has lit up like a Christmas tree, does it keep driving fine until it's shut off?

 

Your reader sucks!

For $20 at Amazon you can get a blue tooth reader that works with any Android phone or tablet. There are dozens of apps available. A couple of good ones are Torque or Dr Prius.

The other option is a $20 Mini VCI cable, a Windows XP laptop, and Toyota Techstream software. This option will pick up sub or detail codes that will help pinpoint the location of the leak.

The missing code is P0AA6.

 

This. And it’s not going to get any better. Plus the battery could explode if you keep resetting it and not fixing the problem.

 

Your home most likely has ground fault circuit interupt outlets in the kitchen and bathrooms. The purpose of GFCI is to avoid shock in the event an electrical appliance is shorted to ground. For example, suppose you drop a hair dryer into the bathtub full of water. Or the toaster ends up in the kitchen sink. If the outlet detects a ground fault, a breaker within will trip to disconnect power to the outlet.

The Prius high voltage battery consists of 28 modules. The modules are electrically isolated from body ground. However, if a module develops an electrolyte leak, the leakage path constitutes a conductive path to body ground. This constitutes a ground fault, much like the home analogy discussed above. The battery ECU has a system to detect the presence of a high voltage leak. As a safety measure, the ECU will register a fault code and prevent the car from starting, once it is shut down. However you've found a workaround is to clear the fault codes, then the car will start at least once, until the ECU logs the fault code again.

I think that you can see that one module leaking, although a safety hazard, does not cause an immediate problem. The problem occurs when a second module develops an electrolyte leak. Now you have battery modules short circuited, which can cause a fire or other damage to the vehicle and perhaps anyone who happens to be inside the car.