Dead Hybrid Battery?

Hi Everyone,

I have a 2006 Toyota Prius with 200,000 + miles on it. Recently I started the car and the Red Triangle, VSC, Check Engine and (!) brake warning light came on. I was away from home and decided to first drive it to the nearest gas station, other than the warning lights everything felt normal and was functioning. I skimmed through the manual at the gas station to see what the error lights represented and most pointed to errors with the brake system. Since the brakes felt fine and the car drove fine I drove it home and made it back without any issues.

When I checked the check engine codes, I had several misfire codes (think I have a bad spark plug) and then a N/A code. Assume the N/A needs to be read with the techstream software. After checking the codes I disconnected the 12 volt battery and reconnected. This cleared all the error lights from the dash board and they did not come back while sitting idol in the driveway for about 15 mins. The following day I drove the car to work and back, roughly 90 miles, and everything worked fine. The next day I drove to work and made it there but when I started the car to leave work I got the Red Triangle, VSC, Check Engine and (!) brake warning light.

At this point I drove off my work site to a quiet road across the street. The error lights where present but the car still felt fine when driving and I successfully made it up a slight incline with no issues. I then parked and decided to disconnect the 12 volt battery again to see if the errors clear again. This time they did not clear and I immediately noticed a severe loss of power when accelerating. I was able to get it rolling at 50/60 mph and it stayed at that pace until I reached a incline, at which point the gas engine needed to work extra hard to make it over the inclines. I noticed that the hybrid battery icon on the display was empty during the drive home, but also noticed that the arrow icon that indicates the wheels and engine are charging the battery never appears. It essentially appeared as if the hybrid battery was removed from the equation (theoreticaly speaking in the display graphic).

Now when I press start the car turns on and allows me to drive it but there is absolutely no power and the Hybrid Battery Fan is always running.

Now, if you made it to this point I thank you in advance for any insight you may provide. But due to the instant loss of power after I disconnected the 12V battery the 2nd time to clear the errors is it possible that a fuse blew that is preventing the flow of electricity between the hybrid battery and the other components? I am waiting on my techstream software and usb cord but I am hoping someone may be able to shed some light on whether there may be another component I can checked before determining if I need a new Hybrid Battery.

Thanks!

 

Thanks for the insight everyone! I got the codes below from Techstream. ‍♂️
- P0A80
- P3019
- P3000
- C1241
- C1259
- C1310
All with either HV or Hybrid Battery in the error description. Ordering a new battery and going to swap it out.

Any tips on the job? I don’t have HV gloves, do most mechanics use them?

 

Do you recommend cleaning the fan as a best practice during the hv battery replacement jod or do you think there is a possibility a clogged fan is the source of the problem?

Planned on buying the battery through Napa, haven’t placed the order yet.

 

What’s the torque spec for those?

 

Hi everyone,

My replacement battery is due in this weekend and I’m getting pre installation butterflies.

Couple questions about this job.
- is there a specific order for disconnecting the high voltage cables from the battery, ie positive or negative first?
- with a Dorman battery can I simply reconnect the high voltage cables the same way they where connected on the previous battery?

Thanks for any last min tips you can offer!