Prius shut off problem

You are posting in the Gen 4 forum. Is this a problem with a Gen 4 car or the Gen 2 listed in your profile?

 

Ok, the moderators will move the thread, but I don't know how to notify them. In any event, what device are you using to look for codes? The symptoms you describe are indicative of a failed or failing Inverter Coolant Pump. Do you see movement of fluid in the coolant reservoir for the inverter when the car is in IG-On mode (2 presses of the Power button, without your foot on the brake)? If no movement, that should throw a P0A93 code, if you are using a device that reads hybrid system codes.

 

Did you source a reliable, quality part?
https://lusciousgarage.com/blog/toyota_prius_inverter_water_pump_recall/
Coolant movement only tells you it's pumping and not totally dead. If you got a Bluetooth OBDII dongle, you can monitor your inverter coolant temperature. Also check the temperature sensor itself.

 

I would say there is still a possibility the pump is bad, particularly if the pump you used as a replacement was not OEM. For what it's worth, the pump on our Gen 2 failed suddenly a couple of years ago, and we had to leave the car at a shop about 100 miles from home. The shop did the job for what I thought at the time was a reasonable price, but later realized they probably used a replacement pump that was the cheapest one they could find. Although I was not seeing any codes or trouble lights a year or so later, I did not see much turbulence in the reservoir, so I swapped out that pump with an OEM one I ordered online, just for peace of mind.

Are you only relying on Auto Zone to read the codes? Not all of their devices are fully hybrid compliant. The easiest way to make sure you are seeing all the codes is to get a compliant reader and use an app like Dr. Prius.

There are several good choices for a reader listed in the following article:

Hybrid battery diagnostic and repair tool for Toyota and Lexus

 

When you say bubbling, you mean turbulence - right?? Bubbling would indicate air in your cooling system; which would cause system overheat and shutdown. Check for leaks and burp your system!!
The amount of turbulence is dependent on the ECU-Inverter temperature sensor feedback loop. The cooler the inverter, the less turbulence.