P0A80 Code- but is it really the hybrid battery

I was wondering in the mean time, of cleaning and servicing the HV fan cause I doubt the previous owner ever did it. I just want to make sure I can remove the cover circled in my pic without any high voltage worries or electrocution worries lol

I also found this girl who cleaned her fan and was going to follow her steps. I know it won't fix my problem but I read it will need to be cleaned anyways when changing the HV battery so

https://blog.machanon.net/2018/02/09/diy-how-to-clean-your-3rd-gen-prius-high-voltage-hv-hybrid-battery-cooling-fan/

 

I have no warning lights on at the moment BUT only because the Dr Prius app erased them by accident. Before that I had the orange triangle, check engine and check hybrid system lights, same as in post 27. I will do that test as soon as I put the fan back, but before taking it off, I put my car on idle and tried with and without EV button engaged and put my hand in front of the fan and didn't feel much...

 

Could those “rust” looking marks on the edge of the battery mean there might be corrosion under?

 

I was just about to ask that if I could keep the top cover off the battery (plastic cover, not metal cover!!) for a while to see if the blades actually turn. I just put everything back together. If I put my hand in front of the fan I feel nothing, a paper doesn’t seem to get sucked in either…but I THINK I hear a very faint noise of a motor but cannot be sure

 

Plugged Innova back up; all i get is the permanent P0A80 (since the current one was erased with Dr Prius). I’ll check in other DTCs, sometimes they diagnose ones that don’t show up.


I got a random P0301 (pending)- cylinder 1 misfire (no idea why, didn’t have this before or yesterday when I plugged up innova) last time I did anything in the engine was sep 2023 when I changed the head gasket and haven’t had a problem there since

B1423 (had it before)
B1503 (had it before)
B1660 (had it before)
The two related to the P0A80 (C1310 and C1259) do not show up anymore, probably since the P0A80 isn’t currently there.

 

Also just noticed in live data that my fuel system says open loop. It’s always said closed loop. Maybe related to the misfire code?

 

Cylinder misfire disappeared after restarting the car (it was never a confirmed code). I will do thé dr Prius app test tomorrow as it is already colder than 50f hère this evening.

My question is, if it’s the fan (or the battery power unit as you say which I’m assuming is responsible for the fan), this would technically cause my hybrid battery to overheat since the fan cannot get rid of the hot temp of the battery? if it is only the fan, could it be it not working will have lead to my battery being crap at this point? Or do you think if it’s only the fan it could potentially be salvaged?

 

Might sound like a dumb question but does the HV battery just turn on when in EV mode? I don’t think so since it controls a bunch of other shit but I wanted to make sure. Doing fan testing today. Found a mechanic shop who checks batteries (takes out the HV and checks cells) for like 400$. Debating …

 

Update: fan does not work. Tried it idle, driving, using normal engine, using EV mode. At no point did I see the fan moving so unless it auto shuts off when the cover is off or something, but did not move. I do hear some “electrical” noises, almost like something is trying to start or use power but fails..

 

Hi!!

I tried it again yesterday and I'll attach photos.

What I noticed:
1. Battery voltage increases abruptly when braking (don't know if that's normal)
2. Fan did not come on at any point (it's currently plugged but uncovered - like the black tube attaching it to the vent on the side of the passenger door is off- don't know if that would cause it to not work?). However, I read that below a certain temp, the fan does not work. It's quite cold here (-5 Celsius or 23 Fahrenheit) so maybe that's why it's not working? Cause if you look at my screenshot (the ones here as well as the older ones) my battery never really gets hot.
3. Like I just said, battery doesn't really get hot. I know it's cold outside, but wouldn't it get super hot if the fan didn't work and it was overheating?
4. I'm still trying to understand some of the weird Dr Prius app info. Linked below and marked with a pink hand drawn * on the picture, is the Dr Prius more app info I got the other day with the weird data.

I posted a few Dr Pirus apps from 24-03-22 when I went to try the fan. Like mentioned earlier, if there's a pink asterix, it's from the other day with the weird Dr prius data.

I did quite a bit of research and found a list of things it might be, before the battery. I'm not saying my battery is in tip top shape, obviously with the age it isn't, but even with my very little knowledge of HV batteries, I just find it weird that all I have is the P0A80 code, with absolutely no symptoms of a bad battery.
A lot of the 'other causes' I found align with your list, so I will try to see how to test these other things. My husband is really against me opening the battery myself cause he thinks I'll electrocute myself , but I'll try to test the things that don't require me removing the battery, and if I need to remove it I'll bring it to a mechanic I guess.

Let me know what you think of the list of causes I found, there's some that are what you said, but I'd like to know your opinion on the other potential causes I found:
1. Blower motor controller
2. Failed battery smart unit
3. Traction battery ECU
4. Loose, broken or corroded bus bars
5. Blower relay
5. Inverter coolant pump
6. HVBMS sensor failure

Another question; is the Traction battery ECU and the battery smart unit the same thing?? Because I heard the traction battery ECU is in the glove compartment??? But earlier someone said they were interchangeable terms I think? I don't know a little lost on that aspect

once again, thanks a million

 

I might sound like a total newb right now (I kinda am) but how do I apply 12 volts to the fan?