2011 GX460 Transmission Issues 147k miles

[Cj80cruiser]

Sad day

Bought this truck less than a month ago and here we are getting transmission codes. At the shop now getting it looked at.

Used my 15 year old ultra-gauge to read the codes. I plan on doing more research on recommendations for a replacement. Anyone have any suggestions? Scan gauge (2 or 3) or ultragauge with tranny temps or other?

Will update as I go through whatever this process will be.

 

[Cj80cruiser]

This is where I am today. Absolutely no confidence this will fix my problem. We will soon see. Fingers crossed this works but from what I’ve read about this issue I won’t be that lucky.

 

[thescreensavers]

S

Thread 'GX460 P2714 P0761 Ultimate Summary and Hope For A Fix Thread'

Dec 15, 2023

Be sure to read all the posts as much has been learned in a few years…

Lexus GX460 P2714 P0761 Collection of Info

Hey crew! I know many of us have been affected by this issue with some replacing their transmission at around 80-180k for $7-8k.

On all forums and groups this appears to be a mystery with pockets of info here and there. I’d like to collect all the info and hope others who properly fixed it WITHOUT buying a new transmission can let us know what the real issues is as normal Toyota dealers and Indy shops usually recommend replacing the solenoids and eventually the whole...

• StriderWolf
• fix gx460 lexus gx460 thread transmission issue
• Replies: 682
• Forum: GX460 / Prado150

• 

 

[r2m]

If that fixes it, what you paid for the fix is worth the price of admission!
Hoping for the best for you!

 

[M4ever]

Which additive did they put? I would recommend the standard Lubeguard Red first, before the platinum or any other transmission fixes in a bottle.

 

[Cj80cruiser]

Which additive did they put? I would recommend the standard Lubeguard Red first, before the platinum or any other transmission fixes in a bottle.

I don’t know. Didn’t care to ask because I had no hope that it would work. So far it’s performed well but I still feel like it’s just a matter of time.

Got a scangauge 3. I’ve been monitoring transmission temps since like a hawk. Most driving puts me in the 190-225 range on average days usually staying 195-210. Drove in some pretty hilly conditions yesterday in pine mountain ga seeing temps get to almost 240.

 

[BlkGX2011]

Ive had P2714 and P0761 and initially only showed up during winter (cooler) weather. I tried a drain and fill and added friction modifier, which seemed to help but still had codes show up. Trans would slip under hard acceleration on freeway. Added a transmission cooler and that helped with slipping on freeway during acceleration. Eventually, I lost reverse upon cold starts until it warmed up.
I ended up getting a remanufactured transmission put in (DIY in my garage). Ive still got the aftermarket transmission cooler with thermostat pinned and no issues whatsoever.
Leading theories suggest issues with clutches or O-rings within transmission that are leading to pressure losses.
To prevent this, transmission coolers with thermostat pinned help prevent transmission from overheating and frequent transmission oil (5yrs/50k miles) changes are recommended.
I'd start saving up for a remanufactured transmission. Codes mean that ecu is detecting slippage that are related to internal wear of transmission.

 

[evolute]

Ive had P2714 and P0761 and initially only showed up during winter (cooler) weather. I tried a drain and fill and added friction modifier, which seemed to help but still had codes show up. Trans would slip under hard acceleration on freeway. Added a transmission cooler and that helped with slipping on freeway during acceleration. Eventually, I lost reverse upon cold starts until it warmed up.
I ended up getting a remanufactured transmission put in (DIY in my garage). Ive still got the aftermarket transmission cooler with thermostat pinned and no issues whatsoever.
Leading theories suggest issues with clutches or O-rings within transmission that are leading to pressure losses.
To prevent this, transmission coolers with thermostat pinned help prevent transmission from overheating and frequent transmission oil (5yrs/50k miles) changes are recommended.
I'd start saving up for a remanufactured transmission. Codes mean that ecu is detecting slippage that are related to internal wear of transmission.

How difficult was the tranny swap? Any reset process with techstream? I’ve read differing viewpoints.

 

[BC11SVT]

Ive had P2714 and P0761 and initially only showed up during winter (cooler) weather. I tried a drain and fill and added friction modifier, which seemed to help but still had codes show up. Trans would slip under hard acceleration on freeway. Added a transmission cooler and that helped with slipping on freeway during acceleration. Eventually, I lost reverse upon cold starts until it warmed up.
I ended up getting a remanufactured transmission put in (DIY in my garage). Ive still got the aftermarket transmission cooler with thermostat pinned and no issues whatsoever.
Leading theories suggest issues with clutches or O-rings within transmission that are leading to pressure losses.
To prevent this, transmission coolers with thermostat pinned help prevent transmission from overheating and frequent transmission oil (5yrs/50k miles) changes are recommended.
I'd start saving up for a remanufactured transmission. Codes mean that ecu is detecting slippage that are related to internal wear of transmission.

~9:00 mins shows the hardened seals cause most of these issues.
Regular fluid changes and keeping ATF temps down (aux cooler + pinned open trans tstat) will basically eliminate that issue.

 

[BlkGX2011]

How difficult was the tranny swap? Any reset process with techstream? I’ve read differing viewpoints.

Im moderately handy with my own mechanical work. I have a lot of tools. Having the right tools is a must.

I'd rate it 8/10 as far as difficulty (at least using my own mechanical experience as a scale)

Biggest issues i had was getting the transfer case to line up correctly and the three 10mm bracket bolts at the top front of the transmission, hardly any room to get hands up there and no visibility. Transmission can only tilt like 10 degrees before hitting firewall. Passenger exhaust manifold has to come out to get starter out. Took me ~25 hours of actual work to do the whole transmission replacement, over a 3-day period. This is after having the knowledge/experience to do the replacement on a GX460 specifically.

Yes, I did the techstream AT memory reset. I would say its required but you can also drive without doing it. It probably won't shift as efficiently. Getting techstream to work on a virtual machine within my PC was an issue in of itself. Only certain OBDs have the correct communication protocols and wiring. VCX Nano worked for me. It beats the mongoose scanner thats $600.

VXDiag VCX NANO for TOYOTA TIS Techstream V18.00.008 USB Version

The USB version VXDiag VCX NANO for Toyota OBD2 diagnostic tool supports original TIS Techstream software V18.00.008, supports multi-languages, supports diagnostic tests, programming matching, custom functions, key matching, etc. VCX NANO Toyota runs faster than mini vci. It will do TPMS...

www.vxdiagshop.com

 

[thescreensavers]

~9:00 mins shows the hardened seals cause most of these issues.
Regular fluid changes and keeping ATF temps down (aux cooler + pinned open trans tstat) will basically eliminate that issue.

Cooler ATF and an external filter ie not relying on the felt strainer are the best things you can do for your trans. It improves a plethora of potential issues.