Latest Launch X-431 Software Update
Pro
Joined: Jul 2021
Posts: 694
Likes: 617
From: Crosslake, MN
The BCM, ECM, TCM, or any other module don't store diagnostic or bi directional events. They react from input from diagnostic tools. To perform bidirectional events they need input from an outside source. As of now for this operation of the flush needs to be from Techline Connect. This will change when the third party devices can copy it.
Pro
Joined: Mar 2021
Posts: 627
Likes: 417
From: Virginia, Lynchburg-adjacent
I just got an update to the GM software on my Launch x431, to version 49.50.
It appears to get to the flush procedure as in other screenshots. It's asking me to warm up the transmission first and apply the brake. I didn't start the car because it's late here.
Any ideas what's new in this update?
It appears to get to the flush procedure as in other screenshots. It's asking me to warm up the transmission first and apply the brake. I didn't start the car because it's late here.
Any ideas what's new in this update?
Heel & Toe
Joined: Jul 2022
Posts: 23
Likes: 7
I just got an update to the GM software on my Launch x431, to version 49.50.
It appears to get to the flush procedure as in other screenshots. It's asking me to warm up the transmission first and apply the brake. I didn't start the car because it's late here.
Any ideas what's new in this update?
It appears to get to the flush procedure as in other screenshots. It's asking me to warm up the transmission first and apply the brake. I didn't start the car because it's late here.
Any ideas what's new in this update?
Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
People aren't reading the thread.
Others have already updated their device to version 49.5.
Even though the option to conduct the flash is there, it produces a communication error meaning the third-party software hasn't gotten it figured out.
For those following along, 49.45 introduced the correct option. 49.5 provided the correct procedure. Neither factually does the flash, it just errors out.
Maybe after a few more updates it'll work, but not with 49.5.
Others have already updated their device to version 49.5.
Even though the option to conduct the flash is there, it produces a communication error meaning the third-party software hasn't gotten it figured out.
For those following along, 49.45 introduced the correct option. 49.5 provided the correct procedure. Neither factually does the flash, it just errors out.
Maybe after a few more updates it'll work, but not with 49.5.
Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
Completed the DCT fluid and filter change today.
I used an authentic MDI2 and the three day GDS 2 subscription to run the hydraulic fluid flush cycle before changing the fluid and filter and the hydraulic leak test afterwards.
Sure, it’s more time consuming than an oil change, but certainly not enough to warrant what the dealership charges.
I’ll create a thread with some screenshots and the contraption I used to fill the DCT.
One thing of note, is the fluid flush forces fluid through the filter. However, even after a flush, filter removal and drain there’s 1.5qts of fluid remaining in the transmission. It’s important after the initial fill to cycle through drive, reverse and neutral to allow the fluid to fill all the channels then top off again before allowing it to warm over 50C to conduct the leak test.
I used an authentic MDI2 and the three day GDS 2 subscription to run the hydraulic fluid flush cycle before changing the fluid and filter and the hydraulic leak test afterwards.
Sure, it’s more time consuming than an oil change, but certainly not enough to warrant what the dealership charges.
I’ll create a thread with some screenshots and the contraption I used to fill the DCT.
One thing of note, is the fluid flush forces fluid through the filter. However, even after a flush, filter removal and drain there’s 1.5qts of fluid remaining in the transmission. It’s important after the initial fill to cycle through drive, reverse and neutral to allow the fluid to fill all the channels then top off again before allowing it to warm over 50C to conduct the leak test.
Drifting
Joined: Aug 2022
Posts: 1,876
Likes: 782
From: Stamford, CT
So, there's a 1.5 qts of old fluid that remains?
Completed the DCT fluid and filter change today.
I used an authentic MDI2 and the three day GDS 2 subscription to run the hydraulic fluid flush cycle before changing the fluid and filter and the hydraulic leak test afterwards.
Sure, it’s more time consuming than an oil change, but certainly not enough to warrant what the dealership charges.
I’ll create a thread with some screenshots and the contraption I used to fill the DCT.
One thing of note, is the fluid flush forces fluid through the filter. However, even after a flush, filter removal and drain there’s 1.5qts of fluid remaining in the transmission. It’s important after the initial fill to cycle through drive, reverse and neutral to allow the fluid to fill all the channels then top off again before allowing it to warm over 50C to conduct the leak test.
I used an authentic MDI2 and the three day GDS 2 subscription to run the hydraulic fluid flush cycle before changing the fluid and filter and the hydraulic leak test afterwards.
Sure, it’s more time consuming than an oil change, but certainly not enough to warrant what the dealership charges.
I’ll create a thread with some screenshots and the contraption I used to fill the DCT.
One thing of note, is the fluid flush forces fluid through the filter. However, even after a flush, filter removal and drain there’s 1.5qts of fluid remaining in the transmission. It’s important after the initial fill to cycle through drive, reverse and neutral to allow the fluid to fill all the channels then top off again before allowing it to warm over 50C to conduct the leak test.
Burning Brakes
Joined: Nov 2022
Posts: 1,046
Likes: 1,108
From: Western Mass
The HSF is required before each required filter change per the GM procedure. If had the device to do it myself I would run that procedure before changing the filter even earlier than GM requires (which I'll be doing sans the HSFat this point).
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Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
Yes, hence why the HSF is required as part of the maintenance. Essentially, the engineers know that it’s impossible to completely drain this transmission so their resolve is the HSF procedure to push all the fluid through the filter before draining.
If we can’t drain it all, let’s ensure what remains is as clean as possible.
If we can’t drain it all, let’s ensure what remains is as clean as possible.
Drifting
Joined: Aug 2022
Posts: 1,876
Likes: 782
From: Stamford, CT
Ok but
Yes, hence why the HSF is required as part of the maintenance. Essentially, the engineers know that it’s impossible to completely drain this transmission so their resolve is the HSF procedure to push all the fluid through the filter before draining.
If we can’t drain it all, let’s ensure what remains is as clean as possible.
If we can’t drain it all, let’s ensure what remains is as clean as possible.
Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
Also, <15% (closer to 12) - very rarely is any fluid ever drained 100%. Dry capacities are 11.62 quarts for normal use and 13.73 quarts for track. On a normal fill, it'll take a little over 10 quarts initially and after settling by toggling drive, reverse, and neutral another .5 quart for normal use.
I don't consider 3 years short for a DCT fluid change nor do I consider 22,500 miles short for the filter, but I do consider them a profit generator for GM service departments @ $1200+/each.
Last edited by blkgenius; Mar 4, 2024 at 05:51 AM.
Burning Brakes
Joined: Nov 2022
Posts: 1,046
Likes: 1,108
From: Western Mass
Agree 100%. I think folks would be wise to get comfortable with changing the DCT filter themselves even without doing the HSF at intervals much shorter than what GM "requires". To guard against warranty drama I would have the HSF/filer change done at the required interval in the owner's manual. Every 10K miles at a min. Or every time you change the DCT fluid even if you don't get that many miles between filter changes. You're under the car anyway and its only another $100ish.
Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
Agree 100%. I think folks would be wise to get comfortable with changing the DCT filter themselves even without doing the HSF at intervals much shorter than what GM "requires". To guard against warranty drama I would have the HSF/filer change done at the required interval in the owner's manual. Every 10K miles at a min. Or every time you change the DCT fluid even if you don't get that many miles between filter changes. You're under the car anyway and its only another $100ish.
But if you have the rear cradle sheer plate off then you might as well change the fluid and filter while you’re at it.
In my case, the C8 isn’t a daily so I’d reach 3 years before I hit the next 22,500 mile interval. So I’ll change the filter and fluid once I get there.
Burning Brakes
Joined: Nov 2022
Posts: 1,046
Likes: 1,108
From: Western Mass
There’s another OEM that uses the same DCT and has a 9000ish change interval. They either know something that GM doesn’t (or does) or it’s more of a money grab. I suspect they know something
Drifting
Joined: Jan 2014
Posts: 1,614
Likes: 1,112
From: Cincinnati OH
Instructor
Joined: Jan 2024
Posts: 100
Likes: 98
From: NoVA
I'm not aware of any OEM that utilizes the TR-9080 transmission. Although the TR-9070 (GT500) shares a similar design, they aren't identical or interchangeable. Additionally, the TR-9070 has a longer fluid interval compared to the TR-9080. Regardless of whether that particular OEM has more knowledge than GM, it's GM's warranty that concerns people, not that OEM.
Race Director
Joined: Aug 2016
Posts: 12,710
Likes: 10,137
From: Garden Valley CA
The Maserati MC20 uses a Tremec TR-9080 transaxle but I don't know if it is a M1L as used in the Stingray or a M1M as used on the Z06, or something else.
Last edited by RKCRLR; Mar 4, 2024 at 11:22 AM.