troubleshoot dash warning lights

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How did you determine what to research, do you have a OBD2 reader or known DTCs?

That inverter pump should be running at all times. The liquid level is not that sensitive, but keep it between the lines and bleed.

Do you have access to an OBD2 reader or can you visit the local auto parts store and borrow one?

 

There are tons of things that can trigger those lights. I'm pretty sure that if they had a separate light for every possibility, there would be no room for people in the car. You'll need an OBDII reader that can read the proprietary Prius hybrid codes. Many, if not most, scanners at parts stores don't have that capability, but it's free, so worth a try. You'll need the code and the sub code to point you in the right direction.

 

How many miles on her?

 

How long have the lights been appearing? Assuming the 12V battery is not discharged, the P0A80 and P3000 do not bode well. You will still need the sub-codes from a Prius compatible reader to determine the exact source of the problem, but it looks like your HV battery either has corrosion or has modules that are failing. Fixing that will involve expensive parts, a lot of labor, or both.

 

P0A80 is a defective hybrid battery. There should be a sub code to tell you more specifically what's wrong with it. It may be a bad cell, but corrosion in the voltage sensing wires can give false reading.

The 441 & 445 are in the evaporative system. Could be as simple as a loose gas cap. I just got a Prius, and now 2 error codes P0441 P0455... | PriusChat

The 3000 I think is associated with the P0A80.

 

If the car is less than 10yrs/150K miles, you might have hit HV battery lotto. Ca is a CARB State.

A dealer will need to confirm P0A80 themselves for warranty.

If you are just outside of warranty (time/miles), ask for goodwill assistance. You are at the mercy of Toyota Customer service. Some people get lucky and get a significant chuck of the bill paid for, leaving them a relatively small amount left to pay (maybe <$1k).

 

The traction battery has failed, which is the meaning of P0A80. P0441 points to a problem with a fuel tank evaporative emissions leak, the vapor pressure sensor or the evaporative vacuum service valve.

Regarding your question about whether the inverter coolant pump is working, you need to look at the coolant reservoir located between the engine and the inverter. I'm not sure if that is what you meant when you said "top center of the engine".