Help With Next Move: Code P0AA6 and Subcode 612

I wanted to add my 2 cents. I had the same p0aa6 with only a 526 sub code. Used the megohmeter on all HV components and could not find the smoking gun. Lucky for me, we have 3 gen2’s. My last ditch effort was to swap out the HV ECU. For me, that was it. Very strange, but this is the second ECU that has partially failed. My ABS ECU stopped registering the LR wheel. Swapped that ECU and she was fixed. Still an amazing car, I have had her since 5 miles from new, she’s around 350,000 now, never has needed a front end alignment, original suspension, HIDs, axles, 55MPG, still drives like the first day I drove her home, everyone in the family has had their turn with her, burns very little oil as long as I add the hot shots stiction eliminator. That stuff really works as she was burning 2 quarts every 5000 miles.

 

Someone please tell me what the B+ 13.73 V is referring to on this detail screen. It's a little hard to see because my laptop screen is going out.

 

I will also add these other screenshots if anyone would mind giving me their thoughts on it. I found this post because I'm in a similar situation but so far I have not done any of the troubleshooting steps towards these codes I have only run the Techstream and got the codes so far.

A little history: we purchased this 2008 Toyota Prius in 2015 with 159,000 miles on it and I'm now at 223,000 miles. I haven't had to do anything to it except for routine maintenance oil and fluid changes. I started noticing the ABS assembly actuator having to pump more frequently over the course of time and it finally threw the code and disabled the car. I found a used ABS module for about $100 out of another Prius and I replaced it and it cleared the codes and works great. After I cleared the codes for that there was one code remaining (b1442). I looked into this code briefly and I could hear a creaking noise under the dash and thought that it may be just the damper vent not opening fully kind of like what I read about the b1442. So because there were no lights on on the dash and everything else was running normally AC blowing cold car running great I just left it alone. I also change the cabin air filter and cleaned the HV battery fan which was terrible because it had never been done and it had paper in it and all kinds of dirt I don't know how it was even spinning. After driving the car a couple times over the next two weeks I was backing the car out of the driveway yesterday and it threw the red triangle so I pulled it back up into the driveway and parked it and received these codes and here I am. This car has a lot of sentimental value and I really would like to keep it running so thank you for everyone's help on this forum.

The strange thing is the current codes no longer show the b1442.

 

I believe that is the 12v state of charge.

It appears you have DTC P0AA6 (HV isolation fault) among others, click the little icon/snowflake/flower to the left of P0AA6, then look for any 3 digit "detailed codes" or INFs.

 

Look at post 22. Assuming that's correct, it's a 612 (battery area) fault.

Posted via the PriusChat mobile app.

 

Do a search for that code in the forum. Basically, there's some type of conductive path between part of the HV hybrid system and the low voltage system (metal of the car body or "12V" wiring).

INF code 612 points to something in the HV battery area. Typical is a battery module seeping electrolyte from a small crack somewhere. Often people see corrosion around the base mounting plate of the battery case near the bad module.

There can be corrosion damage to the orange connector and socket on the battery ecu. Sometimes this can be bad enough to set an isolation fault code.

Posted via the PriusChat mobile app.