GX460 P2714 P0761 Ultimate Summary and Hope For A Fix Thread (5 Viewers)

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The issue with the valve body wearing out is explained very well here: Diagnosing Solenoid Performance Faults in A761, AB60 & A960 6-Speed Transmissions - https://www.sonnax.com/tech_resources/345-diagnosing-solenoid-performance-faults-in-a761-ab60-a960-6-speed-transmissions
My replacement OEM valve body is on the way from Toyota, with new WS fluid, I will update here after I get it installed. I tried to get the reman trans from Lexus but they are on a nationwide back order.
Thanks for reporting back to us as I am not sure someone has done all the pre items, solenoids AND the valve body. Hope it works for you!

Side note… Reading above, I had not heard the theory on GXs in the south having more issues with this. That’s new to me! Interesting as we bought one from TX with great records, service, etc. It appears the ATF wasn’t changed until after 100k, but it fits the mold of a southern vehicle.
 
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I am starting to think this has more to do with a friction, ultimately. Factors contributing to friction may be the fluid itself, pressure, fluid content, friction surface. The solenoids control fluid to the clutches. If it only happens when the fluid is cool/cold, and has happened mostly with southern cars - hotter fluid temps - then maybe that indicates a slight degradation with the clutches.

I am unsure if anyone has tried rebuilding their transmission with success.
Or maybe adding some friction modifier would help with the slipping.

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Thanks for reporting back to us as I am not sure someone has done all the pre items, solenoids AND the valve body. Hope it works for you!

Side note… Readinb above, I had not heard the theory on GXs in the Sputh having more issues with this. That’s new to me! Interesting as we bought one from TX with great records, service, etc. It appears the ATF wasn’t changed until after 100k, but it fits the mold of a southern vehicle.
You were one of the few outliers on here and I almost asked if you were not at elevation in Co. Thanks for clarifying that yours was a Texas vehicle for most of its life that answers that question I had about being an outlier. The location thing really jumped out at me on FB so I started checking on here in this thread. Same thing in common, deep South with a LOT of Florida and Texas vehicles.

Mine spent winters in Texas and summers in Mn. so going with the heat and ATF should not be an issue. But I'm at 49K currently and the Hayden cooler and ATF is in the garage for the install. Weather guesses are claiming teens below zero mid week so I'm not in a hurry.
 
No worries…there’s a lot to read in this thread! Heck, my question was probably answered early on, but I was a little nervous about that tranny blowing up, so I wanted to get some info ASAP.

Sooo, I think I’ll head over to the local L dealership and let them replace the fluid while I get a drive-thru lunch in one of their complimentary loaners!!!

TXCOMT
Do you have a good local certified mechanic that'll do it for much cheaper? Albeit, no Lexus loaner...
 
The issue with the valve body wearing out is explained very well here: Diagnosing Solenoid Performance Faults in A761, AB60 & A960 6-Speed Transmissions - https://www.sonnax.com/tech_resources/345-diagnosing-solenoid-performance-faults-in-a761-ab60-a960-6-speed-transmissions
My replacement OEM valve body is on the way from Toyota, with new WS fluid, I will update here after I get it installed. I tried to get the reman trans from Lexus but they are on a nationwide back order.
Sonnax also provides a guide how to vacuum test the valve bodies but no one here has confirmed to have done that , especially or people that still have issues.

There is some school of thought that the clutches get worn badly when it starts throwing the codes so it may already be too late to save.
 
With all due respect, you still didn't post the mileage on your GX.
At about 100,000 miles I did a drain and fill on my tranny from my local certified mechanic who I trust and have used for over 30 years. (note: not a Lexus dealer).
When he drained it, he stated it was kind of dark, but nothing to worry about.
My GX460 is at 131k and we’re still having problems. Still having a slippage in all gears. Checked fluid level warm. Added 1/2 qt. Test drove it and still having some slippage and now I hear a faint buzz sound. The engine is really strong, but the tranny… cannot say much good about it.
 
I recently bought a 2011 Lexus GX w/ 104k miles. I bought it used, private sale. I've had it for about 2 weeks now, driven only 300 miles. And just today, got the dreaded P2714 & P0761 code. It actually shifts fine.
Its been a Texas & Arizona car its whole life. I've looked through all 13 pages on this thread. All the info I gather, I've deduced that there is no solid, conclusive single fix, except a whole transmission replacement (then ensuring to follow the 60k mile service interval).

People stated replacing the speed output sensors, valve body, solenoids, cleaned connectors/wiring, fluid change with no success (some people have gotten lucky). I think all this research and investment by others will probably save people like me some money (by not throwing money into parts). I'll be investing my money for a transmission replacement.

Sucks that the whole reason I bought the GX was for its reliability and capabilities. I had a 2010 F150 5.4l w/ 230k miles that had a clunky transmission (was told by the shop it needed a new tranny). Now here I am, in the same boat but paid a premium.
We are all here with you…
 
I just wanted to provide an update with my 2010 Lexus IS 350. I'm now at 198,000 miles with the original transmission. (I'm from the Bay Area, California) I started getting the codes at 150,000 miles. Have not received a code at all or noticed any shifting issues since as long as I just put the transmission into sport mode until it shifts from 3rd to 4th during a cold start. I flip it over to Drive right after, no issues. These are also hardly highway miles as well... This is so wild! I don't recommend anyone replaces their entire transmission assembly until we figure out what truly is causing the issue. I feel like if this was a serious mechanical issue my transmission would be toast by this point. I'm also not that easy on it when it's warmed up, I just drive it as normal.
 
So I have read through this entire thread and while I think my issue is distinct, I may also be going down the same path. Looking for some input if "transmission slipping" under 2kRPM is a symptom anyone was having prior to the CEL light coming on.

I constantly have a slipping and sort of metal grinding sound with occasionally apparent slipping but only under 1.5-2k RPM.

I was thinking maybe its the Torque Converter alone but not even sure if I should risk going that route paying about 2-3k for replacement or just going for the entire trans.

Did a full fluid exchange at Lindsay Lexus Alexandria at 100k and currently at 124k with these issues having started at around 120.

Im at my wits end with this issue :(

am going to try sport mode when I go out later tonight to see if that changes its behavior at all after reading through here as well
 
So I have read through this entire thread and while I think my issue is distinct, I may also be going down the same path. Looking for some input if "transmission slipping" under 2kRPM is a symptom anyone was having prior to the CEL light coming on.

I constantly have a slipping and sort of metal grinding sound with occasionally apparent slipping but only under 1.5-2k RPM.

I was thinking maybe its the Torque Converter alone but not even sure if I should risk going that route paying about 2-3k for replacement or just going for the entire trans.

Did a full fluid exchange at Lindsay Lexus Alexandria at 100k and currently at 124k with these issues having started at around 120.

Im at my wits end with this issue :(

am going to try sport mode when I go out later tonight to see if that changes its behavior at all after reading through here as well
So sorry to hear this… is it all gears at the RPM or 3rd to 4th? Ours just has issues with 3rd to 4th in the first 15 minutes.

The sound is something I’ve not experienced. Ours simply won’t shift and revs higher until the CEL comes on and Xmas tree lights on the dashboard.
 
So sorry to hear this… is it all gears at the RPM or 3rd to 4th? Ours just has issues with 3rd to 4th in the first 15 minutes.

The sound is something I’ve not experienced. Ours simply won’t shift and revs higher until the CEL comes on and Xmas tree lights on the dashboard.
In the time that I've been experiencing it I haven't paid enough attention to tell which gears it's in but I will be sure to tonight. I wish I had a CEL to tell me a definitive culprit
 
In the time that I've been experiencing it I haven't paid enough attention to tell which gears it's in but I will be sure to tonight. I wish I had a CEL to tell me a definitive culprit
Turns out its every gear and sport mode did not help other than to confirm that it's in every gear. Guess ill have to dig some more as my issues doesn't appear to be the same as this one.
 
I just did a solenoid swap using a $186 kit from amazon. Sluggish at first. Shifting all gears was sporadic (reverse was slow); like there was air in the pressure solenoid valve or somewhere in the system. After about 5-6 miles of driving and a few reverse gear tries, all seems to be shifting great. I’ll keep you posted.
I know it hasn't been long, but how has this worked out? What codes did you have and did they go away/ return?
 
I know it hasn't been long, but how has this worked out? What codes did you have and did they go away/ return?
Unfortunately, the codes returned, and the transmission is still slipping. We are considering rebuild or replace with a rebuild, or possibly replacing the entire vehicle.
 
Unfortunately, the codes returned, and the transmission is still slipping. We are considering rebuild or replace with a rebuild, or possibly replacing the entire vehicle.
That sucks. I'm debating sonnax valve body and rebuild kit vs replace the whole thing. One would be cheaper and faster, but who knows. Hard to find people who rebuild these with any frequency. Picked up a GS460 to drive while I decide and don't really miss the GX, so I'm kind of losing interest in all of this.
 
The :princess:'s GX (2014 base mdl) started this issue last summer.
This thread showed me how to clear the codes and got us home from the Finger Lakes, so thank you.
She refuses to drive in manual mode, she's doesn't like the feel and is afraid of over revving the engine...But she will wield a 10mm wrench and clear her own codes so she can get home from work. :rolleyes:

I am in the middle of the Sonnax Zip kit install. "Just" have to drop in the check balls and reassemble everything.
There is a discrepancy for one check ball location in the Sonnax instructions in the upper valve body. The gasket plate between the valve bodies doesn't lie though and confirms proper placement.

Just want to say that if anyone else is contemplating this, you need to get a tub of Assemblee Goo, the green not the blue. It's the high tack stuff. https://www.napaonline.com/en/p/BK_...rge-scaApyAEALw_wcB&gclsrc=aw.ds&gad_source=1

Learned about it from this video :. absolute life saver, no mention of the this stuff in the FSM.

This video at 19min, shows where one of the keeps lives that falls out and is not obvious where it came from...cost me and hour plus of chaos management.

You will need this to "goo in" 3 keepers that are not under tension from the spool valves and the Spring Ball that will fall out of the transmission when you pull the valve body. There is no way to install this without the Goo unless the transmission is out of the rig and upside down on a bench. There are also three grommet seals that need to be gooed in place to the trans before valve body reinstallation and three 4 accumulator pistons. 3 of the 4 have o-rings and should stay in place, but I'm not going to trust that. and the 4th is a slip fit and if not gooed in, will not stay. Gravity is working against the assembly.

This is not a job for the faint of heart. I'm a degreed ME and design and manufacture machine-guns for a living...this job has made me question my choices a couple times.


I'll let you know (or rather my wife will let me know) if this gets rid of the codes.
🤞
Hands are warmed back up enough, back to the garage....
 
The :princess:'s GX (2014 base mdl) started this issue last summer.
This thread showed me how to clear the codes and got us home from the Finger Lakes, so thank you.
She refuses to drive in manual mode, she's doesn't like the feel and is afraid of over revving the engine...But she will wield a 10mm wrench and clear her own codes so she can get home from work. :rolleyes:

I am in the middle of the Sonnax Zip kit install. "Just" have to drop in the check balls and reassemble everything.
There is a discrepancy for one check ball location in the Sonnax instructions in the upper valve body. The gasket plate between the valve bodies doesn't lie though and confirms proper placement.

Just want to say that if anyone else is contemplating this, you need to get a tub of Assemblee Goo, the green not the blue. It's the high tack stuff. https://www.napaonline.com/en/p/BK_...rge-scaApyAEALw_wcB&gclsrc=aw.ds&gad_source=1

Learned about it from this video :. absolute life saver, no mention of the this stuff in the FSM.

This video at 19min, shows where one of the keeps lives that falls out and is not obvious where it came from...cost me and hour plus of chaos management.

You will need this to "goo in" 3 keepers that are not under tension from the spool valves and the Spring Ball that will fall out of the transmission when you pull the valve body. There is no way to install this without the Goo unless the transmission is out of the rig and upside down on a bench. There are also three grommet seals that need to be gooed in place to the trans before valve body reinstallation and three 4 accumulator pistons. 3 of the 4 have o-rings and should stay in place, but I'm not going to trust that. and the 4th is a slip fit and if not gooed in, will not stay. Gravity is working against the assembly.

This is not a job for the faint of heart. I'm a degreed ME and design and manufacture machine-guns for a living...this job has made me question my choices a couple times.


I'll let you know (or rather my wife will let me know) if this gets rid of the codes.
🤞
Hands are warmed back up enough, back to the garage....

God speed.
 

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