Transmission Failure or Issues
08-01-23, 03:05 PM
#616
This might not be related to your issue, but I would first make sure your driveshaft splines are properly greased. The spline shafts clunk when they're low on grease, and can feel similar to what you're describing. See below thread for more information.
https://www.clublexus.com/forums/gx-...e-zerks-2.html
https://www.clublexus.com/forums/gx-...e-zerks-2.html
I also regreased all the driveshaft zerks the moment I bought the GX last year.
The issue is definitely the transmission. It doesn't seem to know what gear it wants to be in and suddenly shifts from 2nd to 1st, and it lurches forward. I really want to know if others have this issue.
08-11-23, 01:44 PM
#617
5th Gear
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Transmission Pan Is Leaking
Just took my gx460 2010 into the shop to get the recall done on the pump. They wanted something like $1200 to replace the gasket and refill it. Needs done but I am rather handy so I'm going to replace it myself. Most guide say to capture the amount that came out and replace it with the exact amount that was removed. This makes sense however in my case there is an unknown amount that was lost. Is there a good way to determine how much transmission fluid I should add once replaced? Also in the past when replacing gaskets with my mechanic friend he added some brown fluid to the gasket before sealing it. What was that and should I do something similar? I think it was this https://www.oreillyauto.com/detail/c...s-gx460?pos=13
Last edited by zsnethen; 08-11-23 at 01:48 PM.
08-12-23, 05:21 AM
#618
In our newly acquired 2010 GX we've noticed that sometimes we feel a rumble strip sensation during acceleration. If we let off the accelerator, it will go away. Not sure if this is trans related or maybe u joints, but it's annoying. Also we have notice during acceleration that we get a hard shift feeling when the car downshifts to find more power. Up shifts are smooth as butter, but downshifts are most often "clunky". 154k miles on the rig and I have no service records, but did notice the fill plug on the trans has been turned at some point. Should I do a drain and fill first to see if that improves performance?
One thing I didn't do was check level before my fluid change since I was changing it out anyway. I wish I had. That would be a simple first test to see if low (or high) fluid level may be causing issue. So I don't know if the fluid level was cause of rumble strip issue or old fluid.
This was my gizmo to pin out thermostat, cap line, and circulate fluid out 2 quarts at time by running engine 30-60 seconds each time. Do at your own risk. I was pretty familiar with procedure from doing it on Volvos. Otherwise I might not have risked it.
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cancruiser (09-25-23)
08-12-23, 05:33 AM
#619
In our newly acquired 2010 GX we've noticed that sometimes we feel a rumble strip sensation during acceleration. If we let off the accelerator, it will go away. Not sure if this is trans related or maybe u joints, but it's annoying. Also we have notice during acceleration that we get a hard shift feeling when the car downshifts to find more power. Up shifts are smooth as butter, but downshifts are most often "clunky". 154k miles on the rig and I have no service records, but did notice the fill plug on the trans has been turned at some point. Should I do a drain and fill first to see if that improves performance?
One thing I didn't do was check level before my fluid change since I was changing it out anyway. I wish I had. That would be a simple first test to see if low (or high) fluid level may be causing issue. So I don't know if the fluid level was cause of rumble strip issue or old fluid.
This was my gizmo to pin out thermostat, cap line, and circulate fluid out 2 quarts at time by running engine 30-60 seconds each time. Do at your own risk. I was pretty familiar with procedure from doing it on Volvos. Otherwise I might not have risked it.
The following users liked this post:
cancruiser (09-25-23)
08-13-23, 05:11 AM
#620
Sounds familiar ... the slower the speed and the softer you press the gas pedal, the more clumsy the vehicle becomes. Just when you need smooth and gradual, it becomes rough and jerky! Makes it hard to glide through the parking lot without attracting attention, eh?
I'm convinced it is a result of the transmission attempting to upshift at the earliest possible point, which often means it is in too high a gear for the conditions. The hesitation occurs when you need to accelerate, but the transmission has to downshift first. After that happens and the vehicle surges forward, the transmission upshifts and the cycle repeats ... hesitate, downshift, surge, upshift ... repeat forever!
Pull the shift lever to the left, which will put the transmission in the 'S' mode with the upshifts limited to 4th gear. If your speed drops low enough, such as maneuvering in a parking lot while searching for a parking space, pull back to limit to 3rd or again to limit to 2nd gear ... 1st gear is too jerky for anything other than hill climbing or steep descents.
Once you get back on the road, push the shift lever to the right and let it shift for itself. Even better ... leave it in 'S' and push forward to '6'. You may notice the shift points advance slightly, i.e., the engine revs further before it shifts. Even better, pulling back on the shift lever in 'S' keeps the shifts sequential, e.g., 6, 5, 4, 3 etc. rather than an non-sequential 6 to 4 "double-downshift" when you go 'left' from 'D' to 'S'.
You will pay a small price in mileage for using the 'S' mode, but good gas mileage isn't why we bought the GX 460, right?
Regards,
SaniDel
P.S. As Craig said, this problem could also be caused by low-octane fuel, but I use only 93 octane in sea-level Delaware as you in Florida. The problem is the transmission ... low-octane fuel could make it worse, but using the transmission as suggested solves the problem ... with the proper fuel.
I'm convinced it is a result of the transmission attempting to upshift at the earliest possible point, which often means it is in too high a gear for the conditions. The hesitation occurs when you need to accelerate, but the transmission has to downshift first. After that happens and the vehicle surges forward, the transmission upshifts and the cycle repeats ... hesitate, downshift, surge, upshift ... repeat forever!
Pull the shift lever to the left, which will put the transmission in the 'S' mode with the upshifts limited to 4th gear. If your speed drops low enough, such as maneuvering in a parking lot while searching for a parking space, pull back to limit to 3rd or again to limit to 2nd gear ... 1st gear is too jerky for anything other than hill climbing or steep descents.
Once you get back on the road, push the shift lever to the right and let it shift for itself. Even better ... leave it in 'S' and push forward to '6'. You may notice the shift points advance slightly, i.e., the engine revs further before it shifts. Even better, pulling back on the shift lever in 'S' keeps the shifts sequential, e.g., 6, 5, 4, 3 etc. rather than an non-sequential 6 to 4 "double-downshift" when you go 'left' from 'D' to 'S'.
You will pay a small price in mileage for using the 'S' mode, but good gas mileage isn't why we bought the GX 460, right?
Regards,
SaniDel
P.S. As Craig said, this problem could also be caused by low-octane fuel, but I use only 93 octane in sea-level Delaware as you in Florida. The problem is the transmission ... low-octane fuel could make it worse, but using the transmission as suggested solves the problem ... with the proper fuel.
08-13-23, 07:21 AM
#621
at least you can remedy the pi$$ poor throttle mapping with a peddle commander. Unfortunately we are SOL with the transmission tuning.
We need someone to develop a sophisticated tune that recalibrates the transmission tuning/shift points and throttle mapping. This would really awaken the GX460’s lumbering V8 power train. I’d buy into this.
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AlexDev (08-13-23),
cancruiser (09-25-23)
08-13-23, 07:47 PM
#622
The tuning of the transmission and shift points is horrible in the GX460. “S” mode is a slight improvement, but still not perfect. And ad to this the dull throttle mapping, what a combination!
at least you can remedy the pi$$ poor throttle mapping with a peddle commander. Unfortunately we are SOL with the transmission tuning.
We need someone to develop a sophisticated tune that recalibrates the transmission tuning/shift points and throttle mapping. This would really awaken the GX460’s lumbering V8 power train. I’d buy into this.
at least you can remedy the pi$$ poor throttle mapping with a peddle commander. Unfortunately we are SOL with the transmission tuning.
We need someone to develop a sophisticated tune that recalibrates the transmission tuning/shift points and throttle mapping. This would really awaken the GX460’s lumbering V8 power train. I’d buy into this.
09-11-23, 12:48 PM
#623
P2714 - Looking for Recommendations
Hey all,
I have a 2011 GX 460. It is paid off and I would like to keep it for a few more years. It has a 137k miles on it. I replaced some parts in the cooling system within the last year, but other than that it is in good shape.
## The Problem ##
The day after returning from a long road trip (3 hrs each way) I started the car and some lights on the dash were illuminated. Using a code reader I saw that it was P2714 - Pressure Control Solenoid D Performance / Stuckk Off. I did a little research and that part is inside the transmission case. That's not a job I would normally take on myself. I've never opened a transmission before. I took it to the dealership to hear what they had to say.
They said that they found issues with "some" of the solenoids in the transmission. I asked for clarification if that meant more than one and if they actually ran the test to exercise the part or if they just read the code like I did. I haven't hear back on that yet.
## Initial Quote from my Local Dealership ##
The quote they gave me was for a little under $8,000 to replace the transmission. They said that they don't open or rebuild transmissions. Only replace. They said that they could, probably, reuse "the core", but I'm not sure what that means.
## My Capabilities ##
I have taken an engine apart, but that was 30 years ago and I was in an auto hobby shop. I don't have a cherry picker in my home garage. I do have a rolling jack, stands, wheel chalks, and any size wrench or specialty screw heads that I might encounter. In the past 5 years, on this car, I've done the work to:
## What Are My Options ##
Would you help me enumerate my options or share any insights or recommendations you might have?
What would you do in my situation?
Thanks!
I have a 2011 GX 460. It is paid off and I would like to keep it for a few more years. It has a 137k miles on it. I replaced some parts in the cooling system within the last year, but other than that it is in good shape.
## The Problem ##
The day after returning from a long road trip (3 hrs each way) I started the car and some lights on the dash were illuminated. Using a code reader I saw that it was P2714 - Pressure Control Solenoid D Performance / Stuckk Off. I did a little research and that part is inside the transmission case. That's not a job I would normally take on myself. I've never opened a transmission before. I took it to the dealership to hear what they had to say.
They said that they found issues with "some" of the solenoids in the transmission. I asked for clarification if that meant more than one and if they actually ran the test to exercise the part or if they just read the code like I did. I haven't hear back on that yet.
## Initial Quote from my Local Dealership ##
The quote they gave me was for a little under $8,000 to replace the transmission. They said that they don't open or rebuild transmissions. Only replace. They said that they could, probably, reuse "the core", but I'm not sure what that means.
## My Capabilities ##
I have taken an engine apart, but that was 30 years ago and I was in an auto hobby shop. I don't have a cherry picker in my home garage. I do have a rolling jack, stands, wheel chalks, and any size wrench or specialty screw heads that I might encounter. In the past 5 years, on this car, I've done the work to:
- Replace brakes/rotors (I left the calipers open so that I didn't have to bleed the break line)
- Replaced the secondary air injection pump and both switching valves.
## What Are My Options ##
Would you help me enumerate my options or share any insights or recommendations you might have?
- Is replacing one solenoid easier than I think it would be? I have the time. Is it worth doing myself?
- Should I find a shop that will open the transmission to just replace that solenoid? What should I look for to find a competent shop?
- What happens if I do nothing? What if I clear the code and wait to see what happens? Any chance this was a one-off incident and the part will, potentially, work just fine for a while longer?
- I have the money. Given that I'd like to keep the car for a few more years, is it worth investing in having a professional do the work?
- That much money would be a nice down payment on a new car or a few years worth of monthly payments. Should I abandon my hope of keeping the car for a few more years?
What would you do in my situation?
Thanks!
09-11-23, 03:10 PM
#624
The dealership got back to me. They said the pulled two codes:
Certainly, the intermittently failing parts should be replaced. The whole transmission? I think that is dubious.
Any thoughts?
- P0761
- P2714
Certainly, the intermittently failing parts should be replaced. The whole transmission? I think that is dubious.
Any thoughts?
09-11-23, 03:27 PM
#625
Super Moderator
Unfortunately, reports of successful solenoid replacement are few and far between. One mechanic here, other forum or FB state the window to replace is fairly small before the damage is cast off to the torque converter. I'm no transmission expert. I'm checking to see where the backlog of certified Lexus reman/rebuilt units are at.
My opinion is Lexus should have put AT coolers on all 460s and stressed at least 60K AT fluid maintenance intervals for all vehicles and 30K for those that tow.
My opinion is Lexus should have put AT coolers on all 460s and stressed at least 60K AT fluid maintenance intervals for all vehicles and 30K for those that tow.
09-11-23, 08:10 PM
#626
After clearing the codes, the solenoids are not failing. I imagine it is only a matter of time until they do start to fail consistently.
Would I damage anything outside of the transmission if I delayed replacing the transmission until those solenoids fail again or fail consistently? If I'm going to replace the transmission anyway, what is the rush? My understanding is that the worst thing that will happen is, when the solenoids do fail, the transmission would first be choppy as it changed gears but eventually would tear itself up. Is that correct? If I let it get to closer to that point would I be replacing anything that I am not considering replacing now?
Would I damage anything outside of the transmission if I delayed replacing the transmission until those solenoids fail again or fail consistently? If I'm going to replace the transmission anyway, what is the rush? My understanding is that the worst thing that will happen is, when the solenoids do fail, the transmission would first be choppy as it changed gears but eventually would tear itself up. Is that correct? If I let it get to closer to that point would I be replacing anything that I am not considering replacing now?
09-12-23, 07:18 AM
#627
have you checked the harness yourself? same symptoms can happen from harness issues. A loose connector, a pin pushed back, wire break inside the insulation, many issues with harnesses. 2011 with 137k isnt much. ever changed the fluid? small solenoids can get junk trapped and not work properly a few times, then the junk clears until next time around. Not sure what the DTC actually checks, most likely coil current but could be something else.
09-12-23, 12:53 PM
#628
I was just about to ask about that. The dealership said that I should never change the transmission fluid. Something about it was designed to stay sealed with the initial fluid it has or something like that. Does that sound right to y'all?
So, no, I have never had the fluid changed or transmission flushed on this car.
Last edited by GuyHoozdis; 09-12-23 at 12:54 PM. Reason: typo
09-12-23, 03:15 PM
#630
I have not checked that. That is a great suggestion! Thanks.
I was just about to ask about that. The dealership said that I should never change the transmission fluid. Something about it was designed to stay sealed with the initial fluid it has or something like that. Does that sound right to y'all?
So, no, I have never had the fluid changed or transmission flushed on this car.
I was just about to ask about that. The dealership said that I should never change the transmission fluid. Something about it was designed to stay sealed with the initial fluid it has or something like that. Does that sound right to y'all?
So, no, I have never had the fluid changed or transmission flushed on this car.