Code P0aa6 info codes 526, 613 - Transaxle Replacement Question

all the best!

 

Heheheheh!

 

Pls do info us on how you finally foxed this issue in due time.

Dxta

 

Hi! I know this post is super old. But I am getting the P0AA6 code as well along with 526 subcode (the dealership straight up didnt give me the second subcode) and they say i need a transaxle replacement. You said water could possibly cause such an issue, and I literally first started getting this issue immediately after hosing down my 07 prius with a pressurized hose. How exactly can I check these connectors you are talking about? It was about a week ago that I washed it though so if the water is dried now it's probably too late you think?

 

Unless the second sub-code was 613, the dealer cannot make that call. There are three other parts of the hybrid vehicle (HV) system that could be affected. You need that second sub-code to narrow down the area of concern.

FYI, as you are a new member, your post will be moderated until you have 5 or more posts under your belt.

 

There's a possibility the dealer doesn't have the second subcode. The 526 is the one that shows up first. 526 is like the ECU saying "note to self: next start, try harder to pin down where that leak is." When it succeeds, that's when it will log the specific second subcode. So there can be a brief period where 526 is the only subcode there is.

 

This is what they wrote on the report they gave me:
"VERIFIED CUSTOMERS CONCERN RETRIEVED CODE P0AA6 WITH THE DETAIL CODE 526 FOUND TSB PERTAINING TO INTERNAL TRANSAXLE FAILURE OF THE VOLTAGE SYSTEM RAN TEST PLAN VERIFIED INTERNAL FAILURE RECOMMENDED TO START WITH KNOWN FAILURE OF TRANSAXLE AND RECONFIRM NORMAL OPERATION"

 

Oh that's interesting, so maybe they were being honest that that was the only code they got. If the issue is indeed a Voltage Isolation Fault due to transaxle failure, is the car safe to drive in the meantime while I look for a mechanic to replace it, or should I avoid driving it altogether?

 

It should be safe to drive, you just have to disconnect the battery to reset the car every time you want to start it

you might notice some shuddering when you accelerate from a start

 

Yeah I've been clearing the codes with OBD2 scanner so that's even easier.

 

Well, "due to transaxle failure" is premature to say if you only have the 526 subcode. So far, it's just a voltage isolation fault, not further pinned down.

Once the second subcode shows up, depending on what it is, then you'll know whether it's "due to transaxle failure" or "due to battery failure" or "due to inverter failure" or "due to air conditioner failure" or "due to wiring failure", and from there it will be clearer what repair is needed.

 

Only way water would affect the trans is a known issue with the trans resolver plug. It reports trans positioning to the ecu so it knows the phase positioning
Of the motors can’t remember the sub code.

Its a plug on the front of the trans near the fluid inspection bolt hole. Water gets in there and rots out the connector then 3 phase ac power has no idea where the trans positioning is.
Living in Mass it’s a good suspect for any kind of sub chassis rot,

how bad is the front suspension is it corroded as hell? Crawl under the front of th3 car and take some pics please of the suspension let’s see how bad it is under there.

 

I can definitely take a pic and post it tomorrow. There probably is some rust under there. Some background: I just bought the car from my friend, who had it sitting in his driveway not being stared for the past year. I think his sister might have driven it a few times but it was mostly just sitting while he was in another state. When he got back, he put in a new 12v battery, then me and him drove it to Boston (6 hour round trip) and it had no issues or warning lights at all, so I kinda assumed it was fine from that and the fact that he had no issues with it before he moved, and also had it inspected at the dealership before selling it to me. The P0AA6 error code started popping up basically the day I got the car from him, immediately after I washed it with a hose, so thats why I kinda felt like I might have messed it up myself, but I really have no idea.

 

Tell us more about this.

Is your water pressure hghi/low/average? Did you use a spray nozzle of some kind? Where exactly did you spray water and for how long?

 

get it fixed?

 

i found this on mine

 

Never seen that before Bob pretty bad. Car side hybrid battery relay connector rotted or blew off. Bet there was alot of corrosion in that battery case. Leaking battery modules too?

I suspect the OP has a rotted hybrid battery too. Probably the 12 volt battery well is full of water too.

 

I suspect an improperly-torqued nut on that connection. One thing I notice is the tarnish on the cable terminal that extends right under where the nut was, an area that's normally gas-tight under a correctly-torqued nut and will stay clean and shiny.

I was once asked to look at the central air conditioning for a church that had failed on a hot day.

When I opened the box on the outside wall with the outdoor unit power connections, one of the wires had melted through completely, disconnecting itself from the lug. This was like a 10 gauge wire.

When I went to loosen the clamp screw in that lug, it was finger-tight.

 

I did not. After clearing the code, I tried taking it to another Toyota Dealership for a second opinion, but since I cleared the code, they couldnt find anything wrong with it and they didnt charge me. Then of course the code comes back a few days later on a sunday when nothing is open. I bought a MiniVCI cable and one of those knockoff versions of techstream running so that I can scan the car myself the next time the code comes up and check for that second subcode. If it is 613 then I guess I'll know that it's most likely the Transaxle.

 

I may of just forgotten to torque it correctly. replaced the relay and just drove it 400 miles with no problems to the mountains. the second i smell that burning electrical smell again i will know it is wrong. going to check my transaxle fluid for burnt or metal bits as i had originally changed it 10,000 miles ago with the valvoline maxlife syn ATF