I just bought a 2015 prius and it just started to show P0A80 code. I checked the battery with Torque pro app, it appears the voltage is stable like 16.7. When i drive fast (out of ev mode) it never stops but if i drive slowly in ev mode, it shows a message like "CHECK HYBRID SYSTEM STOP THE VEHICLE IN A SAFE PLACE" i learnt that if i remove hybrid battery cable from fuse box and waits for 5 minutes, the message disappears. It always happens when i drive slowly in ev mode. I need your opinions if you had the same thing before. Thank you.
You need to look more carefully at the battery pack not with your code reader with your eyeballs there's things back there out of order not necessarily just voltage readings that you're reading with Dr Prius necessarily but something's not flowing well... is deteriorated so on and so forth. Usually looking under the hood of the HV battery or the case of the HV battery will reveal to you very quickly things are not so nice blackened copper bus bars frosted nuts holding modules and bus bars together possibly taxed wiring the orange wiring etc not just reading with a computer box you have to see unfortunately there could be problems in the HV battery computer that needs to be disassembled look at the feeds from the receptacle to the board you'll see the corrosion etc.
How many miles on your Prius? Download the Dr. Prius app and try it. This is a much better app to diagnose problems with the HV battery. The P0A80 trouble code is triggered when the voltage difference is too high between the 14 battery blocks. The voltage difference between the battery blocks will be greatest during acceleration and during regeneration braking. Do you plan to do the repairs yourself, or do you plan to take it to a shop?
Do you mean the fat white cable in the fuse box? That's the auxiliary battery (12 volt) cable. All the hybrid battery cables are orange (and should be left alone, except by someone taking all the needed high-voltage precautions). Yes, the white 12 volt cable will clear trouble codes if you unplug it for a while. Of course, that doesn't solve anything; it has only made the car forget it detected a problem, until detecting it again.
Today, i checked with better settings of the Torque app and i could see 7 of the modules are broken. I ordered 7 modules from ebay immediately. 242500 miles. I already ordered modules on ebay today. I am planning to do myself. I will also check with Dr Prius tomorrow. Thank you so much for your help. Yes, the white cable in the fuse box. I think i heard it from the video i learnt. You are correct. It must be 12v battery cable. I think clearing and driving will cause more damage to the hybrid battery. Maybe that's why i have 7 bad modules.
It seems i have another problem with my battery modules. One of the module has 79.1 volt and the other one has 24.9 volt. Should i replace them as well or i do something else? Thank you in advance for your time and help.
One module has 79 volts I don't think that's right maybe one half of the battery linked up together like supposed to be might have 79 volts and the other will have the rest to make up near 211. Something doesn't sound right with your test lead placement or something.
You obviously don't know what you are doing. There is no way that you can use an app to determine that 7 modules are bad in the HV battery! An app will show you the 14 battery blocks that make up the complete battery pack. Each block is made up of two modules. So, there are a total of 28 modules in the battery pack. If you try to fix this yourself, you will probably make it worse, not better. Your HV battery has 242,500 miles on it. It needs to be replaced with a new battery pack!
Like I said in my previous post. You do not know what you are doing. Do NOT try to repair your existing HV battery. It needs to be replaced.
There is a learning curve here You have to understand about the nonsense with batteries and how they link together to make more voltage and all that nonsense and all the terminology because if you don't talk about it right then people get confused so on and all that. But be that as it may I don't know all the electronics terminology I am not an engineer none of that was not very hard for me to figure out what was going on in the battery taking the plug out pulling the battery out plopping it on my rolling metal table and looking at pages that I had downloaded from various sites there's nothing to it I immediately saw all the garbage that needed to be cleaned up it looked like a septic system inside of some of these batteries. Nothing would seemingly be okay or work looking like that just one of those things The minute I clean that mess up everything is working 50-70% better it seems like I don't spend a lot of time looking at charts inside of the Toyota software and Dr Prius and all this and that I don't really have time for all that Data doesn't really motivate me a whole lot thank God. And then after the cleaning up and things are working 50% better for you know 6 months to a year if everything is okay with the vehicle and everything is good then I don't mind spending the money and getting a new battery for it truly I don't but I'd hate to buy a battery and have the transmission MG1 or two go out but oh well so I try to get the overall car and reasonable shape before I start spending money on batteries and things like that although the battery can be moved to another rolling chassis very quickly so there's always things like that.
