Engine temperature warning

Good morning priusers! I have a 2015 Prius two and its been excellent. I do all my own oil changes and I have been loving the car since I got it more than 2 years ago. It currently has 159k miles on it.

I wanted to pick the hive mind and I have already searched this forum for the issue but all the similar posts referred to the Triangle warning which I am not seeing. Here's whats happening:

Wednesday when I was driving home, I noticed the Engine cooling temperature warning light come on, It stayed on for about 15 seconds then went off. I immediately pulled over and popped the hood. Noticed no steam and noticed nothing out of the ordinary I searched all over using a flashlight looking for leaks etc. The only thing that was amiss was the coolant level on the reservoir for the Inverter coolant was lower than the low mark. I immediately went to the wal mart and bought new coolant (50/50) and waited for the engine to cool and added it to the full mark. I also changed the oil since I was due up for it anyway.
The next day (yesterday) I drove to my dental appointment and noticed the light come on again. And then immediately go out. (about 15 seconds). The light didn't come on any more at all yesterday after having drove a good 100+ miles.
I already have a Veepak bluetooth OBD2 reader installed so I downloaded a new app to read it while the car is on. I monitored the temperature continually. This is Engine temperature though and as far as I can tell the inverter coolant temperature is not on this app (it may be a paid version option, I will have to dig into this when I get back to my car after work) When I drove it all day yesterday and also on the way into work today the most it got to was 91C when climbing hills and it would cool off down to 81C normally. The light has not come on since yesterday morning.

So far what I have read on here is, it could be an inverter pump, as I do not see any leaks. I will continue to monitor it using the app, if the light does come back on *knock on wood. Honestly I am in NO position to be spending any money on anything and yet I need my car for work I am stuck in between a rock and a hard place if this needs repaired, in these difficult times. I do plan on doing a radiator flush and full tune up when I get my tax return next year but now money is so tight I am living on a razor edge.

 

I am sorry I misread I do not have a Prius V - this should not be in the V folder.

 

Thank you
Wow ok I added the mixture I thought it was the same - Have not had any issues but I was just going off old posts in this forum. How hard is it to flush that now? Lord I don't need any headaches

I will look again but I didn't see any evidence of a leak anywhere. I drove it yesterday and had no warning lights on the dash and the temp didnt get above 95C - The air temps here have been in the low 70s

Another culprit could be a fan - I read where the fan may not be kicking on

 

Also do you know if there are two different pumps one for the engine coolant and one for the inverter coolant?

 

UPDATE:

So I checked the level of the engine coolant after work and it was indeed lower. I ran the scanner app again and it came back with a code of P148F
Online research says this is "Engine Coolant pump over revolution"

Searching that code on this very site says that it needs to be replaced ASAP. I need to beg borrow or steal to get this thing fixed

I limped it all the way home after work after re-filling the coolant and the temps never got above 92 C I did turn the heat on full blast and it was very hot, leading me to believe that the heating still works, it still is pulling heat from the block or wherever it pulls it from. Hopefully its just a pump I do not have the $ for anything else

 

I took it to the (Steal)er today and they hooked it up to their Toyota diagnostic equipment and verified the coolant pump - Replacing it on Tuesday - because they don't have the part.