Sounds like something that BMW is known to do. BMW always has ecu updates to fix their tranny problems

 

I spoke to ta1972 and he had the same problem I was having which is a hard clunk when coming to a stop as the car get below 10mph now if you are having this same problem and having hard shifting then the problem is not your transmission its your main ECU. Like you I too went to Lexus for them to check the car out and the told me my transmission need to be replace...so I got a used one and ended up with the same problem and was getting frustrated. I ended up talking to Ta1972 and replacing the ECU and now my car drives like its brand new.

 

I have the same problem with the jerky transmission when coming to a stop.

Did you say you replaced the ECU and it fixed the problem. I have a 2006 Lexus gs300 .

 

This is a great post , did Lexus fix the problem or did you take it else where to have it fixed , if so who fixed the ECU for you ?

 

No Lexus was very adamant that the transmission was the problem and wanted me to replace it. So I ending buying the ECU from them with my shop discount it's about $1200 without it it $1550 ...and it solve my problem.

 

Thank you for your reply ,it is greatly appreciated.

Did your shop reprogram the ECU for you as well ?

 

My 2006 gs300 jerks as well when coming to a stop,usually a soft one then a hard jerk. I took it to the shop today they think its the transmission but it shifts and drives fine only when stopping. Any thoughts anyone?

 

It's not the transmission, replace the Ecu.
The Ecu runs about 1400-1500 , and a 130.00 for installation.

 

Taking car to the dealer tomorrow, unplugged the battery, unplugged the ecu 10amp fuse no change. Ill keep you guys posted on what the outcome is. Still a soft jerk then a hard one when stopping.

 

Did you find out what the problem was mine does the same thing.

 

[QUOTE=ta1972;8953001]It's finally fixed!!! I'm super happy!!! It was the fricken ecu all this time!!! Lexus should make this a recall!!![/QUOTE

Can you explain the process of getting it fixed? Did you just swap ecu and it worked? How fif younfind out it was the ecu?

 

Hi i just got a 06 gs300 and i have a very bad downshift i feel 2 kicks on 2nd and than on 1st when it come to stop
I checked for code nothing was found . Do you have any ideas on that please let me know
209-495-9333 thank you
I dont want to keep buying parts and putting them on

 

You need to replace your main ecu , I have a 2006 Gs300 with the same problem.

The Ecu is about 1400, and the installation is about 130.00 including programming.

 

I took My 2006 lexus GS430 Lexus of Greenville In Greenville sc Had a harsh jerk when coming to a stop. I took it to lexus and the said it was the transmission. I hold the service advisor that i was reading a post, from lexus forum that the ECU was the cause. He came back an hour later and said the TEC said it was the transmission. I was sceptical. He said it will cost around 5000 to fix it. My mind was saying the are taking advantage of me. Well i let them do the work. (GUESS WHAT NEXT AFTER THEY PUT A 5000 TRANSMISSION IN IT) They came back and said it need a (ECU) I told them that i said that before you cost me 5000 for nothing. Needless to say it was another 1700 for the ECU. It ended up costing 6,700 for the total fix.

If you have the same problem with the transmission, has a harsh jerk shifting when you come to a stop, DO NOT LET LEXUS TELL YOU IT THE TRANSMISSION, DO THE ECU FIRST.They will tell you anything to get to sell you the repair work.

feel free to to ask me any questions.

 

Man I would call Lexus Customer Care at 1-800-255-3987 and open a case regarding this. They may reimburse some of your costs. It's worth a try! I just went through an ordeal with my GS 350 and had to replace the engine. They gave me $2000 service credit to cover the labor.