P0aa6

mahen · 07-15-2009, 02:41 PM

Some customers with 2004 to 2008 model year Prius vehicles may experience a M.I.L. "ON" condition with DTC P0AA6 or P3009 with information codes 526 and 613.

taggart · 07-15-2009, 02:59 PM

Quote:

Originally Posted by mahen

Some customers with 2004 to 2008 model year Prius vehicles may experience a M.I.L. "ON" condition with DTC P0AA6 or P3009 with information codes 526 and 613.

Then again, some may not.

richard schumacher · 07-15-2009, 04:55 PM

You never can tell.

jayman · 07-15-2009, 06:03 PM

I replied to your other thread. There is a "sticky" in the Technical section

Transaxle Failure

Hope this helps

mahen · 07-16-2009, 04:51 AM

I am having the MIL on with DTC P0AA6 and inf 526 and 613. But i can drive normally if i reset the dtc. But it comes again when i stop the car but i can reset it again. Now i am waiting for a HV transaxle to arrive by air which may take a week or more for the replacement. Is it safe for me to reset the dtcs and drive.

mahen · 07-16-2009, 05:02 AM

anybody has an idea how much weigh the hv transaxle assembly?

Mike Dimmick · 07-16-2009, 06:47 AM

P0AA6 is a 'hybrid battery voltage system isolation fault'. The car will drive normally until you turn it off, then it won't go into READY. It indicates that the car thinks that there's a possibility of shock from the HV battery, because there was an unexpected voltage drop somewhere in the system.

This code was changed between 2005 and 2006 model years, by SAE's request. 2005 and earlier cars - with tinted brake light lenses - report code P3009.

I would do a lot of testing with a megohmmeter, as described in the service manual, to ensure it was definitely the transaxle that was faulty. It's an expensive and complicated part to replace.

mahen · 07-16-2009, 08:28 AM

Thanks

As a newbie, I Am still not sure 100% if everything i am doing is right.

I checked the standard resistance for 6 terminals ( 3 for MG1) and (3 for MG2). The first 3 are above 10 MΩ as per service manual. Only the other 3 terminals for MG2 is giving less resistance. According to the Repair Manual, i come to the conclusion that i need to change the HV Transaxle Assembly.

Tommorrow I am also taking to the toyota dealer for an another check.
Any suggestions i will appreciate.

mahen · 07-17-2009, 04:01 AM

Today i went to the toyota dealer and they scan the problem and they said the following:-

MG2 TORQUE WAS SHOWING NEGRATIVE RPM
STATE OF CHARGE INCREASED BY 0.3 INSTEAD OF 0.5

THEY SAID THEY NEED AROUND 1 WEEK TO CHECK THE PROBLEM.
I TOOK MY CAR BACK.

ANYBODY KNOWS ABOUT THIS ISSUE. PLEASE HELP

jayman · 07-17-2009, 01:39 PM

It still sounds like the cvt needs to be replaced. But I wouldn't have any faith in your dealership

07-15-2009, 02:41 PM	#1
mahen Junior Member Join Date: Jul 2007 Posts: 15 My Car: 2006 Prius Model: N/A Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	P0aa6 Some customers with 2004 to 2008 model year Prius vehicles may experience a M.I.L. "ON" condition with DTC P0AA6 or P3009 with information codes 526 and 613.

07-15-2009, 04:55 PM	#3
richard schumacher Destination: Eschaton Join Date: Mar 2004 Location: United States Posts: 5,510 My Car: 2004 Prius Model: N/A Package: #6 Thanks: 99 Thanked 93 Times in 66 Posts Friends: 0	Re: P0aa6 You never can tell.

07-15-2009, 06:03 PM	#4
jayman Senior Member Join Date: Oct 2004 Location: Winnipeg Manitoba Posts: 11,564 My Car: 2004 Prius Model: Package: B Thanks: 35 Thanked 185 Times in 168 Posts Friends: 12	Re: P0aa6 I replied to your other thread. There is a "sticky" in the Technical section Transaxle Failure Hope this helps

07-16-2009, 04:51 AM	#5
mahen Junior Member Join Date: Jul 2007 Posts: 15 My Car: 2006 Prius Model: N/A Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: P0aa6 I am having the MIL on with DTC P0AA6 and inf 526 and 613. But i can drive normally if i reset the dtc. But it comes again when i stop the car but i can reset it again. Now i am waiting for a HV transaxle to arrive by air which may take a week or more for the replacement. Is it safe for me to reset the dtcs and drive.

07-16-2009, 05:02 AM	#6
mahen Junior Member Join Date: Jul 2007 Posts: 15 My Car: 2006 Prius Model: N/A Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: P0aa6 anybody has an idea how much weigh the hv transaxle assembly?

07-16-2009, 06:47 AM	#7
Mike Dimmick Senior Member Join Date: Aug 2008 Location: Reading, UK Posts: 698 My Car: 2008 Prius Model: Package: T3 Thanks: 7 Thanked 108 Times in 69 Posts Friends: 0	Re: P0aa6 P0AA6 is a 'hybrid battery voltage system isolation fault'. The car will drive normally until you turn it off, then it won't go into READY. It indicates that the car thinks that there's a possibility of shock from the HV battery, because there was an unexpected voltage drop somewhere in the system. This code was changed between 2005 and 2006 model years, by SAE's request. 2005 and earlier cars - with tinted brake light lenses - report code P3009. I would do a lot of testing with a megohmmeter, as described in the service manual, to ensure it was definitely the transaxle that was faulty. It's an expensive and complicated part to replace.

07-16-2009, 08:28 AM	#8
mahen Junior Member Join Date: Jul 2007 Posts: 15 My Car: 2006 Prius Model: N/A Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: P0aa6 Thanks As a newbie, I Am still not sure 100% if everything i am doing is right. I checked the standard resistance for 6 terminals ( 3 for MG1) and (3 for MG2). The first 3 are above 10 MΩ as per service manual. Only the other 3 terminals for MG2 is giving less resistance. According to the Repair Manual, i come to the conclusion that i need to change the HV Transaxle Assembly. Tommorrow I am also taking to the toyota dealer for an another check. Any suggestions i will appreciate.

07-17-2009, 04:01 AM	#9
mahen Junior Member Join Date: Jul 2007 Posts: 15 My Car: 2006 Prius Model: N/A Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: P0aa6 Today i went to the toyota dealer and they scan the problem and they said the following:- MG2 TORQUE WAS SHOWING NEGRATIVE RPM STATE OF CHARGE INCREASED BY 0.3 INSTEAD OF 0.5 THEY SAID THEY NEED AROUND 1 WEEK TO CHECK THE PROBLEM. I TOOK MY CAR BACK. ANYBODY KNOWS ABOUT THIS ISSUE. PLEASE HELP

07-17-2009, 01:39 PM	#10
jayman Senior Member Join Date: Oct 2004 Location: Winnipeg Manitoba Posts: 11,564 My Car: 2004 Prius Model: Package: B Thanks: 35 Thanked 185 Times in 168 Posts Friends: 12	Re: P0aa6 It still sounds like the cvt needs to be replaced. But I wouldn't have any faith in your dealership