ICE ran all the way to work. No codes found

See what happens on your way home if you got no codes and there's nothing wrong there may be in fact nothing wrong because you're gas mileage is down on the display is no indication of anything wrong per se My display swings wildly between 44 and 47.1 the advertised gas mileage of my car in '09 and my Gen 3 generally doesn't seem to get the mileage of my '09 even though sometimes it'll say it's getting 51 mi to the gallon I go by the empty tank fumes the amount of gallons I put in the last time etc and what I'm putting in this time is never 50 anything to the gallon it's more like what the Gen 2 runs 47 48 somewhere right in there . The display is for certain types of folkses entertainment pretty much

 

Usually when those systems start messing up which I've been through with an '09 and a 13 and a 10 you will be quickly warned with a lot of lights and a lot of hoopla and then a bunch of codes they will show up The lights especially triangle of death ABS traction control etc etc That's what you want to be really watching for of course watch your gas mileage somewhat and like you say not being able to put it in EV mode and all this business I don't ever move that in my we pretty much keep it in the Eco mode drive around as we need air conditioning is generally on in the southeast etc and everything seems to stay pretty stable right around 47 48 mi to the gallon. No matter what we're doing

 

I've noticed engine will continue to run, sometimes, with good charge, if it's an exceptionally hot day, and the car's been doing a lot of stop-and-go. Maybe due to battery getting too warm?

 

Are you certain you hadn't made that trip with the shifter position accidently in "B", which would have those effects?
Did the same thing occur on your way home?

 

I’ve drive mor than 20 mins around town 35 mph and under with lower grill fully blocked during summers and most of the time engine temp never gets over 180F.

 

From memory EV mode is not available when:

Battery charge too low (below ~50%)
Battery charge too high (above ~80%)
Battery temp too high (above ~100F)
Speed too high (10mph when coolant is < ~155F, 25mph when coolant is over ~155F)

The dash state of charge meter isn't very accurate - the range of 2-6 bars represents roughly 50-60% charge. 8 out of 8 bars is like 80% charged.

 

Bummer.

 

I had the same issue in my 2014 Prius C Aqua a couple of days back. About 20mins into my morning drive, temperatures displayed by Hybrid assistant app were pretty normal, MG, Engine, battery, inverter all seemed normal. As I slowed down in traffic my battery charge was around 50% but when it went down and ICE kicked in, the ICE continued running until I had all normal battery bars. Normally it charges up to the bare minimum of 2 bars and cycles there until I drive under ICE power continuously then it will then charge to full battery.

So it charged to full and I got worried and kept monitoring for about 3km of stop and go traffic ICE kept running, battery at full bars. I then pulled to the side of the road and cycled the key Off and On and it started behaving normally from then on. The issue has not come back for 3 days now. No Codes or dash warnings so far. I guess I should schedule a battery 'service'.

The attached image is from the moment this issue was happening. If anyone is seeing anything amiss or has an explanation kindly advise.

 

In case you are an electronics nerd, just know it isn't "a battery" its a bunch of them together. This is a good thing as if you are a pro tink you can take the battery and test the individual cells and just replace the cells that gave up completely and go a little further on the other cells that haven't quite raised their white flags yet.

 

You can if you've the time and spare vehicle