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GS300 Transmission issue resolved

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Old Sep 20, 2014 | 01:29 PM
  #1  
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Default GS300 Transmission issue resolved

2006 GS300. 106k miles.

My transmission had 2 problems which were throwing 4 different codes. Problem 1 was a lag while increasing speed.. there were times when the car just wouldn't pick up speed no matter how much I accelerated. Second problem was that it would not shift beyond 3rd gear.

There were 4 codes thrown - p0261, p0251, p2715 and one more. I looked around found a Transmission specialist, really honest guy (Perform Transmission in Santa Clara, CA). He replaced Solenoid D ($750 for parts and labor) and that resolved some of the issues. The car still randomly doesn't go beyond 3rd gear and throws code p0261. Solenoid D has been enhanced by Lexus BTW. It's a different design which is probably because the previous design was bad.

Next step is for him to replace Solenoid C. Won't charge me for labor since he should have done that in the earlier service.

Lexus wanted me to change the Transmission on the car. I'm upset that the car has a Transmission issue.. it's a Lexus and I wouldn't expect this. Not sure I'm going to buy another Lexus because of how they handled this.
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Old Oct 3, 2014 | 08:40 AM
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Default Did you resolve your transmission problem?

Originally Posted by sanjaygb
2006 GS300. 106k miles.

My transmission had 2 problems which were throwing 4 different codes. Problem 1 was a lag while increasing speed.. there were times when the car just wouldn't pick up speed no matter how much I accelerated. Second problem was that it would not shift beyond 3rd gear.

There were 4 codes thrown - p0261, p0251, p2715 and one more. I looked around found a Transmission specialist, really honest guy (Perform Transmission in Santa Clara, CA). He replaced Solenoid D ($750 for parts and labor) and that resolved some of the issues. The car still randomly doesn't go beyond 3rd gear and throws code p0261. Solenoid D has been enhanced by Lexus BTW. It's a different design which is probably because the previous design was bad.

Next step is for him to replace Solenoid C. Won't charge me for labor since he should have done that in the earlier service.

Lexus wanted me to change the Transmission on the car. I'm upset that the car has a Transmission issue.. it's a Lexus and I wouldn't expect this. Not sure I'm going to buy another Lexus because of how they handled this.
Found your post as I am having the same issue with a 2004 LS430 (same tranny). Wondering if you've had a chance to change solenoid C, and if so, did it resolve the shifting beyond 3rd gear issue?

Thanks in advance.
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Old Oct 30, 2016 | 10:00 PM
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any update i have the same problem. probably gonna sell the car
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Old Apr 17, 2017 | 06:35 PM
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Default Hey I need help mine won't shift pass 3rd also

Originally Posted by sanjaygb
2006 GS300. 106k miles.

My transmission had 2 problems which were throwing 4 different codes. Problem 1 was a lag while increasing speed.. there were times wh the car just wouldn't pick up speed no matter how much I accelerated. Second problem was that it would not shift beyond 3rd gear.

There were 4 codes thrown - p0261, p0251, p2715 and one more. I looked around found a Transmission specialist, really honest guy (Perform Transmission in Santa Clara, CA). He replaced Solenoid D ($750 for parts and labor) and that resolved some of the issues. The car still randomly doesn't go beyond 3rd gear and throws code p0261. Solenoid D has been enhanced by Lexus BTW. It's a different design which is probably because the previous design was bad.

Next step is for him to replace Solenoid C. Won't charge me for labor since he should have done that in the earlier service.

Lexus wanted me to change the Transmission on the car. I'm upset that the car has a Transmissio


issue.. it's a Lexus and I wouldn't expect this. Not sure I'm going to buy another Lexus because of how they handled this.

Hey im having same issues mine is it won't shift pass 3rd gear I guess. Revs up to about 4000rpm then gas goes. Please help me did urs get fixed after that second solenoid replace?.
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Old Apr 22, 2017 | 04:35 PM
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How is this issue "resolved" if it still does the same thing... and update please.
Also part numbers would help
Is solenoid D part 3524050050? ( S4) Controls shift 4 to 5 SL1 and back pressure
Is solenoid C # 3524050030 controls shifting 3 to 4 (S3)

Could the wire harness have anything to do with it? something about AC sitting on top of it or front end collision
OR ECU? ECM? TCM? or Calibration update or this might just be for slower gear updates
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Old Apr 22, 2017 | 04:42 PM
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Originally Posted by jehmin
How is this issue "resolved" if it still does the same thing... and update please.
Also part numbers would help
Is solenoid D part 3524050050? ( S4) Controls shift 4 to 5 SL1 and back pressure
Is solenoid C # 3524050030 controls shifting 3 to 4 (S3)

Could the wire harness have anything to do with it? something about AC sitting on top of it or front end collision
OR ECU? ECM? TCM? or Calibration update or this might just be for slower gear updates

I have no answers as I am still digging in the issue. Was told today actually that the transmission fully will need replacing this is a headache 🤕
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Old Apr 22, 2017 | 05:04 PM
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Originally Posted by gs300tube
I have no answers as I am still digging in the issue. Was told today actually that the transmission fully will need replacing this is a headache 🤕
Are they lieing because this is the easy fix or what?
Because it shifts smooth sometimes. If you have a odbII reader you can clear the code while rolling/driving revving high on 3rd and it will shift out.
I used the ELM bluetooth with torquepro and a spare android phone.
I used my cheap obdii but sometimes it doesnt respond or once it got messed up due to a voltage jump or something. Screen was messed up has to toss it but it was $20 at walmart.
If you want to buy the elm devices. dont get the cheap blue ones every one i had of those didnt work but the big black old looking one worked. Im sure the higher end ones will work too

thanks man we are in this together. Please read my posts to see my findings im actually trying to fix it myself and have dropped my pan a few times. Im an average guy and if i can. I would hope you can too
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Old Apr 22, 2017 | 05:12 PM
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Originally Posted by jehmin
Are they lieing because this is the easy fix or what?
Because it shifts smooth sometimes. If you have a odbII reader you can clear the code while rolling/driving revving high on 3rd and it will shift out.
I used the ELM bluetooth with torquepro and a spare android phone.
I used my cheap obdii but sometimes it doesnt respond or once it got messed up due to a voltage jump or something. Screen was messed up has to toss it but it was $20 at walmart.
If you want to buy the elm devices. dont get the cheap blue ones every one i had of those didnt work but the big black old looking one worked. Im sure the higher end ones will work too

thanks man we are in this together. Please read my posts to see my findings im actually trying to fix it myself and have dropped my pan a few times. Im an average guy and if i can. I would hope you can too

He yea I really appreciate that. Yea it totally sucks that we must work on our own ****. I definitely wanna go buy that ELM. And yu can drive with it hooked up and it will clear and work. Def need to try that
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Old Apr 22, 2017 | 06:46 PM
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Originally Posted by gs300tube
He yea I really appreciate that. Yea it totally sucks that we must work on our own ****. I definitely wanna go buy that ELM. And yu can drive with it hooked up and it will clear and work. Def need to try that
I highly recommend it. You can get them on amazon for about 15$ then the torque app is like 5$ and you can just leave it connected to the OBDII.
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Old Apr 23, 2017 | 01:26 AM
  #10  
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I'll go out on a limb here and say this...

I believe the problem is a VSC problem and not a transmission problem. When VSC kicks in, and in your case.. there's a problem with its operation... your car will reluctantly upshift into higher gears to assist you in better traction and engine braking.

Under normal operation, when you accelerate hard and VSC kicks in, your transmission will hold lower gears as long as it can until it is convinced you are no longer on at WOT or potentially WOT again. The system tries to adapt to your driving and throttle prediction.

I hate this feature, but that's how they come.
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Old Nov 27, 2017 | 10:51 PM
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Originally Posted by sanjaygb
2006 GS300. 106k miles.

My transmission had 2 problems which were throwing 4 different codes. Problem 1 was a lag while increasing speed.. there were times when the car just wouldn't pick up speed no matter how much I accelerated. Second problem was that it would not shift beyond 3rd gear.

There were 4 codes thrown - p0261, p0251, p2715 and one more. I looked around found a Transmission specialist, really honest guy (Perform Transmission in Santa Clara, CA). He replaced Solenoid D ($750 for parts and labor) and that resolved some of the issues. The car still randomly doesn't go beyond 3rd gear and throws code p0261. Solenoid D has been enhanced by Lexus BTW. It's a different design which is probably because the previous design was bad.

Next step is for him to replace Solenoid C. Won't charge me for labor since he should have done that in the earlier service.

Lexus wanted me to change the Transmission on the car. I'm upset that the car has a Transmission issue.. it's a Lexus and I wouldn't expect this. Not sure I'm going to buy another Lexus because of how they handled this.
I'm in the same situation you were in my solenoid c&d are stuck but Lexus in Columbia Sc told me I need a new transmission and quoted me nearly 5k. I'm looking and praying for a honest mechanic that can replace my solenoid and hoping it resolved the problem
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Old Nov 28, 2017 | 07:18 AM
  #12  
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Originally Posted by tabitmcl
I'm in the same situation you were in my solenoid c&d are stuck but Lexus in Columbia Sc told me I need a new transmission and quoted me nearly 5k. I'm looking and praying for a honest mechanic that can replace my solenoid and hoping it resolved the problem
I changed the SL2 solenoid and solenoid c.
Which I think the TCC for SL2 Torque Converter and it did not fix my issue. Just change it a little.
No more torque converter codes after solenoid.
But i still get stuck into 3 in safety mode.
Now im gonna change with a used transmission.
Please LMK what solenoids you change and if it fixed your issue. Mine was at about 150K
I also have a ES300 Original Engine Trans at 260K still going strong so this at $150K is unacceptable.
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Old Dec 4, 2017 | 11:26 PM
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I see thread says resolved but by replacing your transmission?
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Old Dec 11, 2017 | 09:43 AM
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I ended up selling my car unfortunately. I tried a couple different repairs to try and fix this, talked to Lexus Corporate about this to get some help from them on the repair. All recommendations came back to just replacing the transmission which I did not want to do.

Having gone through that experience with Lexus Corporate and Lexus Stevens Creek, I would never buy a Lexus ever again.
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Old Jul 1, 2018 | 03:56 PM
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I seem to have the same problem but with a 2nd gen GS300 but it`s just stuck in drive no matter what gear I put it in. I`ve tried replacing my transmission fluid but with no success. It started happening about a week ago when it would just loss power. I had a problem like that before where I just cleaned the MAF sensor but this time I replaced the air filter as well. Just want some clarification on what I should do as I really need it for transport.
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