Sudden red triangle with jerk- wiring harness corrosion?

The car detects bad cells (well, really, it can only detect at the level of a block, twelve cells) by detecting changes in electrical behavior that will exceed its threshold under certain driving conditions, and it has to see that happen twice on separate trips before it is sure of the problem.

When you clear the code and get some period of normal driving before the code and fail-safe behavior come back, that doesn't so much indicate a problem that's intermittent, as that you have given the car forced amnesia about the problem, which it then will not rediscover until the right driving conditions have met the right thresholds, again on two separate trips.

 

Your HV battery pack is made up of 28 modules in series, grouped in 14 blocks of two modules. Each sealed module has six 1.2V cells, so "nominal" voltage is 6 x 1.2V x28 = 201.6V (at "full" charge it can be quite a bit higher than that).

As ChapmanF mentioned, the ecu monitors the voltage of the 14 blocks and will set P0A80 code if the difference between the highest and lowest exceeds a programmed threshold for a certain amount of time. (more difference takes less time until it codes)

That voltage difference usually shows up first under "heavy" charge or discharge (accel - decel). Depending on how bad it is, the ecu can either "just" set a code, or it can also go into "limp-in" mode (which really limits battery operation).

Clearing the codes means the ecu "assumes" the battery is ok, until you drive enough for the weak module(s) to show up again. Eventually the car won't "ready up" anymore. OR there has been a couple threads about folks who kept clearing codes with a bad battery, and eventually had a (minor?) battery explosion.

Posted via the PriusChat mobile app.

 

Get a new lithium pack.

https://projectlithium.com/?ref=9qLPw

Or Hybrid Doctor Fredericksburg

The Hybrid Doctor

 

The guy at the hybrid doctor in Fredericksburg is a great guy from South America He will hook you up if you can go to his place I did that it's 3 hours from my house heading towards my brother's house in DC It was well worth my trip and 650 bucks let me tell you instantaneously huge difference for my Gen 3 if I would have known about this guy when the Gen 2 was messing up I might have not bought a new battery at the time to give this a whirl for slightly less than half price He did a really good job or his employee did at the time I went to Fredericksburg the man himself was in an electric car show in Las Vegas I was dealing with his employees who barely speak English but know their work well and did a good job and we had a good time joking around my broken Spanish and they're broken English was a great afternoon good people.

 

If you call him the night before and tell him your situation he will be on standby when you arrive or one of his text well and they'll take your battery from you if you like and hand you one that's ready to go they'll even put it in a test vehicle sitting right in front of the shop and let you see it run and let you see the doctor Prius app while it's running and whatever else it is you'd like to do and talk about and then they'll set it in your trunk and you'll pay them whatever it is now and off you go or not All you got to do is call the guy he will hook you up Tell him you're from the Prius chat or you know Tom from North Carolina whatever good people