Does anyone have the TCM update that is used to reprogram the torque converter after the triple flush?

I’ve had the triple flush done but have never had the TCM software updated.

Is there a TSB for this software update?

 

There is no such update!

 

There is a TCM update that GM can apply under the overheating "special advisory", but you may be confused with the way the A8 "may take up to 200 miles" to re-learn (adaptive) after the triple flush procedure. I was told to drive it the way I want the transmission to shift as it will try and adjust to my driving style.

 

I changed the A8 trans fluid, blue label, myself. Have hear that some of you at the time of your fluid change that you had the TCM software updated.

Im not sure if the update was a stand alone item or not.

If not then I’d like to look into it if it helps prolong the TCC.

 

Still no such update!!

 

There is an updated TCM program that modifies the way the TCM locks up , I got it off the GM TIS website ..... don't remember the number but when I put my vin in the search it returned the new firmware for my 15

OP , ask the dealer to run the VIN to see if you have the latest update
Dave

 

No! It "possibly" addresses engine overheating.

 

Laserdude. don't know your your background but with all due respect I know what I am doing 😌 not my first rodeo , I do all my own updates with my GM MDI and GDS2 as a pass thru device using the TIS web site to pull down the update and install

The description clearly states that it modifies torque converter lockup . I use 2 day passes otherwise I would log in and post it

Dave

 

Is the modified 'new' software really necessary or just good to have?

 

My 2015 is still running the dirty old hydroscopic fluid and I have 50,000 miles on the car , it's no garage queen . There were three updates available for my car so I loaded the latest and could instantly feel a difference in the way the converter locked up on the highway and around town when in 8th gear

The problem really is not the fluid , it's the programing on how the TCM locks up when in AFM mode . The converter never really locks , it is pulsed by the TCM , this limits the harmonic vibrations that are caused by going into 4 cylinder mode

GM in an attempt to keep AFM changed the fluid to compensate for the shudder that was caused by the pulsing under the guise that the old fluid was hydrosocpic but that is a bandaid and we all know it

After all these years suddenly we have a problem with fluid being hydroscopic really ????? Cut me a break ...

I then tuned out AFM .... now I don't really care how the converter locks up because it will never go into AFM mode

AFM was a failure in the 80's for GM , failed again in the 90's , and once again it was a failure in the early 2000's all for the same reasons, mechanical failure on the parts needed to make it work and vibration when it was working but yet GM keeps trying in the name of the GOV mandated fuel economy standards that are set at stupid levels

Dave

 

Tinkertech, if I am a betting man I would say that when your dealer did the triple flush, they updated the TCM , they should have also done the GARAGE RELEARN procedure , that is why one of the posters above was told to drive the car hard as when you do the relearn the TCM is constantly monitoring the input shaft speed and comparing it to the output speed so it can adjust the pressure and speed so the trans makes a perfect shift every time. Claims of shift flair and banging into gear when shifting have nothing to with the shudder and everything to do with the TRANS ADAPT values being off the mark ..

Dave

 

Question. I’m new new to C7s. Does the triple-flush procedure apply to ALL C7 A8s, post-2014 A6? Thanks.

 

Yes up to 2019 which had the " correct " fluid already but if u are out of warrant it's on your dime as its not a recall it's just a TSB

The question would be is , are u experiencing issues , there are plenty of people like me who have the old fluid and no problems

if so what are the symptom as not all problems are cured with the flush which is what caused so may unhappy A8 owners , dealers were just doing the flush for anybody who complained about anything and then when the flush did not solve the issue everybody started to bash the A8 ....

If it's not broke don't try to fix it ..
Dave

 

Got it. Thanks. Just sold my C5 in anticipation of someday securing a C7. Good to know these insights.

 

have a 19 but was built 05-18 so my a8 have good fluid?? watcha think?

 

NOPE, Feb 2019 is the cut over date

 

Dcasle,
I changed the ATF fluid myself. Believe it or not 4X. 2x with the 'black' label and 2x with the 'blue' label.

Did it in my garage using my QuickJack and a Mytie Vac. Sucked it out and pumped it in. Car had less than 1500 miles at the time. Since I did the exchange myself the software was never 'updated'. The trans runs smooth and shifts great.

Was just wondering if everyone who has the fluid changed at the dealer did their trans get the software update or not and is it really necessary.

BTW I have tuned out the AFM on my car as soon as I got it. No V4 mode.

 

Tinkertech , I have to get my lazy butt in gear and do the same with mine , I have a Quick Jack also so I have no excuse 🤣 but I do need to change my filter so I have to drop the pan 🤣. I might just take it to my dealer who did a great job installing my new motor ....

Dave

 

Thanks for all the replies.

For now I'll just not worry about it and run it as it is.

 

Well, that's disappointing! I was very much hoping that you would pursue this TCM lockup software a bit further.