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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!
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.
Do you have a good local certified mechanic that'll do it for much cheaper? Albeit, no Lexus loaner...
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.
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.
We are all here with you…
Exactly what happened to us and why we started this thread. So sorry, hang in there! We’ve been doing the shift mode for 2 years.
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.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
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 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.
bummer to hear that, man.
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.
's GX (2014 base mdl) started this issue last summer.
The
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.
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....
