Prius randomly loses power, slippage light often illuminates

Seems like it would be that or the wiring too The traction control computer or that computer If you know you don't have a mismatch set of tires then the next thing I would be looking at is wheel sensors and/or their pickups or in this case there tone ring any of them are chipped or messed up that can cause a problem similar.

 

Sometimes the quickest way to troubleshoot a situation like this is to use Techstream or a comparable scan tool to pull up the "ABS History".

It will show the most recent four times the ABS or traction control got triggered, and everything the ECU thought was happening at the time: wheel speeds, steering angle, vehicle speed and g forces, yaw rate, etc.

If one of those inputs was in some way wrong, leading the ECU to think a skid was in progress, the wrong input will often be easy to spot.

 

That would surprise me ... Dr. Prius is sort of known for being able to show some engine trouble codes, some battery trouble codes, some information that is generally battery-related, and have a bunch of special features and screens that are meant for evaluating the traction battery ... but otherwise not being able to do much of what a capable scan tool would.

There are other choices that have been reviewed in this thread:

Gen2 OBD2 app review | PriusChat

 

^^^ This.

 

What u don't see when pulling codes w the wrong scanner is what would scare me from relying on the misinformation at hand