Check Hybrid System

welcome!

how many miles on her? do you plug in?

i'm surprised the dealer didn't scan for trouble codes, maybe it was some bad gas

 

Your Prius has no alternator and no belts.
Are the coolant and oil levels ok?

 

If you have a Windows laptop lying around, I would look into acquiring a mini-VCI cable (Amazon) and Techstream. These will help you diagnose your current and any future problems with the vehicle by yourself—for free—without having to run to the dealer every time.

With Techstream, you can even retrieve codes that were previously set. This means that you don't need to wait for the symptoms to return before you start diagnosis. If it is known that a problem exists ('Check hybrid system' message, violent shaking), it's best to be proactive and figure out exactly what it is.

 

DTCs (diagnostic trouble codes) related to the vehicle's braking system can be read using nothing more than a short wire or paper clip. With the car turned off, short pins 4 and 13 on the OBD2 connector using the wire/clip, then put the car in IG-ON (press the POWER button twice with your foot off the brake).

Now observe the blinking pattern of the ABS warning, brake warning and slip indicator lights in order to identify the DTC. If there are multiple codes, they will blink out in ascending order. Each of the indicators may blink out a different code so note that carefully. The two digit codes obtained correspond to full DTCs that can be looked up in the repair manual.

I don't think this shows historical codes, though. And to be able to check codes from all other ECUs, you really do want Techstream.

 

This post by @ChapmanF and the thread it belongs to may be illuminating.

There are only two genuine cables I know of—the XHorse M-VCI (sure does look like the original, unlike all the XHorse clones on Amazon) and the DrewTech MongoosePro Toyota 2. Only these are known to maintain a stable electrical connection with the vehicle, which can be pretty important when performing longer operations such as bleeding brakes, flashing firmwares, running tests, or logging data during a test drive. However, for only pulling codes or changing a few customizations, any of the others should be fine.

 

Well, I'll be darned—I was sure the only genuine X-Horse ones you could buy were rare vintage units.

Still, the DrewTech is the only one Toyota actually endorses.

I sometimes use an Openport 2.0, which is also 'genuine' in the sense of being designed and built by a known company that's actively in business developing it. At least, you can get genuine ones by buying directly from Tactrix. They also are plagued by cheap clones sold elsewhere.

My Openport is stable and reliable, but has certain Prius tricks it can't do, like some TPMS operations in Gen 3, or some key fob registration in Gen 2.