I recently drove in a flood and while driving I got check hybrid system. I have dtc code P0AA6 'hybrid battery voltage system isolation fault'. What do I replace???
probably a high voltage leak, maybe a/c compressor. maybe the hybrid battery. i don't think water could get into the tranny, but not sure. how deep was the water? your car is unsafe, high voltage is leaking to the chassis. i would not drive it until the fault has been located and repaired. someone else posted a tsb on troubleshooting and repairing a flooded car. you need tech stream to read the sub codes. all the best!
The car. (sorry....couldn't resist!) The problem in your case probably is not how deep the water was, but rather what kind of bow wave you were producing, and where all of that water was going. My thinking is that you clear the code and see if its recurring, and then see of your fault is in the battery or the "transmission" which will give us an indication on next steps.... Do you happen to have a megohmmeter? Back when dinosaurs roamed the earth they used to have crank handles on them, and 99.99999999999999999 percent of the time we used them for purposes OTHER than checking wires for insulation problems..... There's a small chance that this problem will self-clear.....but there's a HUGE chance that some unscrupulous dealer......which is to say nearly ANY dealer will see this code and immediately jump to the traction battery.... so be careful! Good Luck!
Back when dinosaurs roamed the earth they used to have crank handles on them, and 99.99999999999999999 percent of the time we used them for purposes OTHER than checking wires for insulation problems..... Wow, does this bring back memories of the used-ta-fish 606 and 719. Here, hold these leads for a sec.....followed by a quick crank Been on both ends of that experience....the crazy things guys do when bored from poking holes in the ocean.
Someone else posted the TSB, but here is the link: T-SB-0229-12- Flood Damaged Vehicle Inspection & Handling
Yeah, right? I was a boomer weenie (Chicken of the Sea) but my brother was on the Green Thing (614) and the front half of the USS Sanfranlulu (718)
I ran the test and the code comes back while on neutral. So that means the high voltage battery. What would be the next step?
My guess is from the HV battery pack area. The contractors and the ECU might have shorted out from the flooded water. That would have also, if you aren't lucky, discharged the battery pack. If you don't attack this problem with the attention it deserves, you might end up, having the complete pack replaced. Bear in mind that rate of corrosion or damage on the HV battery system components, increases with everytine delayed. You may be replacing some few stuffs in there. I have handled some highlanders, prii, and camries with flooded battery pan. These pictures might help. PIC 1-2: HV contractors corroded due to flooded water PIC 3: Battery pack on display showing extent of corrosion PIC 4: Shorted out ECU PIC 5: Level of flood on the highlander
The car is driving fine. The battery seems fine also. The cruise control doesn't work and the EV, ECO & POWER MODE mode buttons do not work that's the only thing.
From the subcode you showed, it appears you have an insulation problem within the car's HV system. The likely areas could be any of the following: Frame wire•System main relay•System main resistor•HV battery assembly•Electric inverter compressor•Battery ECU•HV transaxle assembly•Inverter with converter assembly•Main battery cable•No. 2 main battery cable•Battery plug•No. 2 frame wire•Junction block. Since the problem came up just when you went through the flood, my quess could be that the problem might be on the HV battery pack area. Have you opened up the cover of the pack to assess the pack itself? Can you post the fatalist of the info from your tech stream here please? Dxta