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Hi, I am new to the forums. I have a 2006 Gen II prius where it was throwing the red triangle, VSC and Warning message on my screen. I bought the Techstream software to read the codes since it did not throw any generic codes that my OBD reader could detect. Techstream picked up a fault code P0AA6. I did the test to see if the issue was in the hybrid battery, the inverter, or the transmission. The code did not come back when I checked the battery but when I turned the vehicle on and then put it in neutral, the error code did come back on...which i believe means the voltage fault is either in the inverter or the wiring between the hybrid battery and the inverter.

I have not seen any good instructions on how to replace the inverter assembly on a Gen II prius. My guess is to pull the high voltage orange plug for the hybrid battery, disconnect the 12V aux battery, drain the Toyota long life fluid from the inverter, pull the inverter cover, disconnect the electrical connections, disconnect the plumbing connections, disconnect the mechanical connections and then remove the assembly. Any other advice before i get started?

Thanks,
Jeff
 

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Bad news: A P0AA6 code is usually an expensive one.

Techstream will narrow down where the fault is.

I had this on a 2008 Prius late last year.

Techstream error codes:



Double-click on the "Hybrid Control" link and more information appears.

Detail Code 2 is the giveaway. They all show 526, but that 612 tells us where the fault is, and 612 is for the hybrid battery.

Apparently 613 is more common, which indicates a faulty transmission.



The battery data seemed all ok...



I had a mobile mechanic who specialises in Toyota hybrids come over and have a go. He removed the copper connection bars from the battery, commented that they looked ok, but then cleaned them anyway.

Upon reassembly the P0AA6 code was still there.

We spent hours on this.

I had another Prius not being used so eventually we gave up and swapped the hybrid batteries over.

Months later I went and checked the error codes on the donor car, and now it’s giving me a P3019 code (ie faulty module in battery Block 9). Well, at least that helps narrow it down.

Some other photos to look at: https://www.facebook.com/pg/LusciousGarage/photos/?tab=album&album_id=425182400934867

Use Techstream to find that sub-code. That will narrow down where the fault is.
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If you haven’t already, remove the side interior trim and clean the blower fan that blows air into the hybrid battery to keep it cool.

What I found on a Prius recently:





A few minutes with an air compressor and toothbrush and it was clean enough to use again.

 

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Discussion Starter #4
Phildo,
Thank you for the information. I just replaced the hybrid battery with a refurbished one with a 2 year warranty. I also cleaned the fan blower.

I will check the INF codes and see what it tells me. Thanks again. I will post what I find out.
 

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Update: I just checked the codes and it showed a second INF code 526 and then code 614. So perhaps my inverter is going bad. Anyone have documentation of how to change out the inverter? Thank you for your help.
 

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I am also willing to buy the manuals if anyone knows a good place to purchase the Gen II Prius manual, as long as it shows how to remove and install the hybrid inverter.
 
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