GS - 3rd Gen (2006-2011) Discussion about the 2006+ model GS300, GS350, GS430, GS450H and GS460

Jerk/jolt/clunk when coming to a stop

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Old 02-11-15, 09:28 PM
  #16  
Gotcha350
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Originally Posted by Tantrix
Sounds like the engine mounts, my old acura legend had the same problem till I changed out the mounts....it could be something else.
+1....i still have my Legend and experienced the same thing along with vibrations...it was the motor mounts...I would start with an inspection of those as well...
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Old 02-14-15, 07:33 PM
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My 06 gs430 currently developed the down shift clunk. Same issues. Don't think it has anything with the mounts. While I was coasting around 20 miles I put the gear in neutral and braked, There was no clunk. Only happens when I'm in gear to coming to a stop. It up shifts fine thru all the gears. The mileage on my gs is 145k miles. I Drained and filled the fluid about a few times. I didn't do a flush.
There are two clunks that happens. While I'm coming to a stop, a small noticeable clunk and followed by a slightly bigger clunk. What could it be? Some people are saying that it could be some solenoid or the ecu? Which ecu? Engine or trans?
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Old 02-16-15, 08:17 AM
  #18  
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Originally Posted by ta1972
My 06 gs430 currently developed the down shift clunk. Same issues. Don't think it has anything with the mounts. While I was coasting around 20 miles I put the gear in neutral and braked, There was no clunk. Only happens when I'm in gear to coming to a stop. It up shifts fine thru all the gears. The mileage on my gs is 145k miles. I Drained and filled the fluid about a few times. I didn't do a flush.
There are two clunks that happens. While I'm coming to a stop, a small noticeable clunk and followed by a slightly bigger clunk. What could it be? Some people are saying that it could be some solenoid or the ecu? Which ecu? Engine or trans?
Excatly the same thing is happen my mine it has 140k and it's annoying everytime I come to a stop its jerking. Let me know if you find the problem.
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Old 02-16-15, 08:27 AM
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I also noticed a 4th to 5th gear delay and slightly rough up shift. What the hell is going on?
I thought these engines and trans suppose to be "bullet proof" if u maintain them. Wtf!
Another thing is, does anybody know if there would be a stored codes without showing any " check engine" light? With these issues on my car, there no check engine lights that are on. Kinda wish a fault light would show so u could get it checked out to see which sensor or solenoid.

Last edited by ta1972; 02-16-15 at 08:30 AM.
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Old 02-16-15, 01:13 PM
  #20  
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Originally Posted by ta1972
I also noticed a 4th to 5th gear delay and slightly rough up shift. What the hell is going on?
I thought these engines and trans suppose to be "bullet proof" if u maintain them. Wtf!
Another thing is, does anybody know if there would be a stored codes without showing any " check engine" light? With these issues on my car, there no check engine lights that are on. Kinda wish a fault light would show so u could get it checked out to see which sensor or solenoid.
My 2nd gen with a lot more mileage has no issues on the trans. I think these 3rd gen 6speed auto are weak links on them.
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Old 02-21-15, 10:59 AM
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Originally Posted by ta1972
My 2nd gen with a lot more mileage has no issues on the trans. I think these 3rd gen 6speed auto are weak links on them.
Does anybody have some answers for these issues or clueless?
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Old 02-22-15, 08:29 PM
  #22  
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got this same issue... anyone with a clear diagnosis and fix please share.
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Old 02-22-15, 08:38 PM
  #23  
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Entry #24 on this thread maybe?

https://www.clublexus.com/forums/gs-...w-speed-2.html
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Old 02-23-15, 08:45 PM
  #24  
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That fix sound promising... would love to hear if anybody else has had success with replacing the shifter solenoid.
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Old 03-13-15, 10:42 PM
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It's finally fixed!!! I'm super happy!!! It was the fricken ecu all this time!!! Lexus should make this a recall!!!
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Old 03-15-15, 09:19 PM
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Originally Posted by ta1972
It's finally fixed!!! I'm super happy!!! It was the fricken ecu all this time!!! Lexus should make this a recall!!!
How much did this cost you out of pocket?
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Old 03-15-15, 11:55 PM
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I did a lot of research and spent around $1500 in parts only. I did all the labor myself.
These were used parts and some new. This would of cost to the average person around a few grand and up.
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Old 03-18-15, 04:24 PM
  #28  
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Originally Posted by ta1972
I did a lot of research and spent around $1500 in parts only. I did all the labor myself.
These were used parts and some new. This would of cost to the average person around a few grand and up.
I replace my transmission because Lexus told me it was bad and still I have the same issue...so I'm happy that you replace the ecu and it works. Where did you get the ecu from, how much it's gonna cost and does it need to be reprogram?
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Old 03-19-15, 09:57 AM
  #29  
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Originally Posted by AlvinGS300
I replace my transmission because Lexus told me it was bad and still I have the same issue...so I'm happy that you replace the ecu and it works. Where did you get the ecu from, how much it's gonna cost and does it need to be reprogram?
If lexus told you to replace and still the same, then you should complain to them for misdiagnose first.
They have to take responsibility for that. If they can't help you, then you would need to find out your ecu part number. You would have to get the exact part number to marry it to the car.
Pm me if you need some advice.
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Old 04-21-15, 03:49 PM
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Originally Posted by ta1972
I did a lot of research and spent around $1500 in parts only. I did all the labor myself.
These were used parts and some new. This would of cost to the average person around a few grand and up.
Hey do you have a direct email or number I really need advice love this car and I'm sitting at a dealership about to trade because Lexus told me I may need to replace my transmission... What's the ECU I need help please!!!!!
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