P0A80 Code- but is it really the hybrid battery

It's a generation 3 and you're all in with a head gasket done and everything running very well It seems like you would want to get with somebody or a group maybe up in Montreal or Quebec somebody in a local group of Prius owners might have the tech software from Toyota? If you can get a hold of that you can actually see a whole lot more than you're seeing now. Do you have the doctor Prius app? If so what does it show for your battery health there's a whole screen that deals with that I have the same code in a 2010 right now I changed out the battery to a 2015 battery that's in very good health and the car runs great but even the Toyota software won't rid me of the permanent same code as you posted here The hybrid battery one so we've been driving with that permanent code for the last 4 years and apparently we've never driven the drive appropriately to make that code clear is what my understanding is of all the business what that drive actually entails I'm not positive but this car is used for delivery service so it's in the wind all day and most of the evening so I'm not sure what kind of driving would need to be done to make this permanent code disappear I've read about the drive but apparently we can't make it happen or there's something else in this.. me personally I would want to see what my battery looks like all blocks all modules the whole assembly Yes it could be your battery ECM the HV battery ECM it is possible usually those get cleaned because of funk building up on the board bars and what have you I think they're quite expensive also so you wouldn't want to buy one generally you'd want to buy one from a junk car from one of those battery rebuilding places they'll have stacks of them they're not worth anything when you've got a few hundred in your shop.

 

No, P0607 is about the ECM's ability to control the heating current to an oxygen sensor. Could implicate the sensor, wiring, the ECM, or a leaky exhaust system. If that code comes back, there are six pages of troubleshooting ideas in the repair manual that can be followed.

Toyota Service Information and Where To Find It | PriusChat

Was it only showing in the 'permanent' column, or also in the 'current' column?

If only in the 'permanent' column, it could be the memory of a code that was only current once in the past. But just having a memorized permanent code doesn't turn warning lights on, so there should have been at least one code showing as current.

No, the ECM specializes in controlling the gasoline engine, and the codes aren't related.

The 'state' of the battery (in the sense of its distance from cradle to grave) is a complicated mix of things. There are some tests you can do (you'll see answers about this online) that will be like snapshots of a few of the things the battery ECU monitors continuously, but because the ECU is able to monitor them all and relate them in real time, its opinion is likely more dependable than yours. By showing P0A80, it has given you its opinion that the battery is now far enough from cradle to grave to be worth doing something about.

The "with no apparent triggering reasons" simply reflects that the battery has been on a steady slow trajectory its whole life, the ECU has been watching that, and there will always come a day when the trajectory crosses the "yup, show P0A80" line. The day before, it was just on the other side of the line, is all.

The dealer will definitely just offer replacement; they aren't in the whack-a-mole module replacement business. As a DIYer, you can pursue the module-level replacements if you choose. Sometimes you'll get a lot more trouble-free driving before whacking the next one, and sometimes not.

P0A80 is a pretty specific code. A car can have other hybrid-system issues, like the pump that cools the inverter (not the battery), but those situations have their own trouble codes.

 

Trouble code P0A80 for the HV battery is listed as a permanent code, so you do not need to be worried about it. If the HV battery is good, the permanent code will clear at some point. If the P0A80 is listed as current, then you need to worry about it.

Do some research about the Dr.Prius app, which is good for evaluating the HV battery.

 

At some point take a look at your battery cover under your battery cover Do you see the bus bars they're supposed to be bright copper then now turning black maybe a bluish color the nuts holding the bus bars on in their yellow holders and all that You see them starting to frost? If so these things will hold up electricity lot of times just cleaning the bus bars in the nuts dressing the fittings whatever it is you do can make a huge difference just the Prius being a car out in the open maybe parked outside so on and so forth It's kind of like a boat you know just has a roof as you see by post here rodents get in and out of these things trunks can leak all of it can be like a terrarium in some of these vehicles that will take its toll on bus bars and nuts and things like that on a battery I just cleaned one up last week maybe a huge difference I mean it's like night and day practically It may not last long The battery is 8 years old 10 is nominal or max life for the most part so there's always that but I guess you can't complain about every lasting 8 to 10 years for the most part that's pretty good sure isn't Dad's Duracell.

 

None of the photos in #4 show any current code about the battery at all, so there's nothing there showing any current reason to be worried about it. "P0A80 permanent" means the car still remembers some time in the past when it showed a P0A80, but it doesn't mean that code applies now.

Question, though: have you got the triangle-exclamation warning light, or the "CHECK HYBRID SYSTEM" message showing? There has to be some current hybrid system trouble code, if those are on.

 

Something's not adding up. You're talking about a code you can clear, and then about when it "does go on" (how can you tell when it goes on? Do any warning lights or messages come on, or do you only notice the behavior changes you've mentioned)?

That sounds a lot like a 'current' code. A permanent code is different: it doesn't put any warning lights on, it doesn't change the behavior of the car; it's just the car remembering that code was detected once. You can't really clear a permanent code; it goes away in its own sweet time, only after being satisfied the problem's all gone. You can follow a confirmation driving pattern if you want to satisfy it sooner.

Could it be that this Innova is showing a code as 'permanent' when it really means 'current'? Seems weird.

 

I use an even cheaper in over brand scanner I think it's a 3210 looks like this but older and it definitely discerns between permanent and when it's not permanent it's just a code there's no word permanent below it or above it and there may or may not be freeze frame day to depending upon the type of code on the Toyota Prius It will not read everything but it does a dang good job I rarely have to get TS out to be honest about it unless it's something really weird and other than the standard things we know like inverter cooling pumps and all this sort of thing so the enova was given to me actually buy a mechanic that died his wife gave me a lot of his things and this was in it and he was a GM guy so I just figured whatever but then I started using the little thing and it actually did quite well and I was quite surprised pleasantly I guess

 

Yeah you need to kind of have an idea what's going on cleaning and doing stuff back there so probably better not watch some videos get a better idea of what's happening and then maybe one day take something like the doctor Prius app and monitor your battery for a little while and see what you see like I say we have a 2010 with a permanent same code It's never cleared The car is very weird but that's another whole deal in itself so I wouldn't worry about it if your car is driving well and things look relatively decent and Dr Prius the battery monitor part of it then you're probably generally speaking okay till you tax the battery climbing and descending hills or whatever a lot of them or something like that You may not notice anything maybe in the summer time with the air conditioning on things will change we'll see.

 

I would not do any cleaning or disassembly of the HV battery until you know what the trouble code is that is triggering the lights on the dash. The HV battery is high voltage and can be dangerous if you do not know what you are doing.

I would drive the car and find out what the code is so that you can start the diagnostic poscess to fix the problem. Make sure you have a good scan tool with you at all times and do not clear the trouble codes until you have retrieved all of them.

 

No in my 2010 solar roof car I replaced the battery about 5 days after I got the car with a junkyard 2015 battery when I did that the code moved from being active and I never really checked it I didn't even know it was permanent We were just driving the car using it blah blah blah then a few months later I actually bought the real Toyota software on a toughbook computer with the VCI cable and everything so of course I went over to the car and connected it up was running great with no issue we just figured we'd try out the new software plugged it up ran everything did a health check and this code popped up as being in there and permanent there are some driving procedures you can go through apparently to help clear this up or what have you We didn't pay that any mind We just closed up the computer turned everything off and she kept using the car for Uber eats DoorDash and Amazon flex put $170,000 mi on that battery and it still working fine but the code is still there no triangle no anything for the whole $160 some odd thousand miles so far and now it's rattling in the head gasket is the issue and we're probably not going to fix.

 

Probably was a current P0A80 then, with only the permanent record showing up later, after 'erase' cleared the current one and turned the warning light off.

Yay for permanent codes—otherwise there'd be no record of what code had been there and been cleared.

The parameters the car looks at to set a P0A80 are pretty specific to the condition of battery modules themselves, and not so much to other issues like the internal wiring or tarnish on the bus bars. It might not 'hurt' to look at those things (provided you know how to do it without getting hurt) but expecting to find a quick fix there will probably lead to disappointment. Problems like broken voltage sense wires have their own different trouble codes.

You may find that the bus bars can look quite tarnished where you can see, but will be shiny clean under the nut flanges where it matters. As long as the nuts were properly torqued and haven't been disturbed before, those connections have been gas-tight from the time they were torqued to the time you loosen them to see underneath.