DCT flush procedure
Safety Car
Joined: Jul 2013
Posts: 4,408
Likes: 3,485
From: Granada Hills CA
Pandorasback wrote: "If you are in the camp that would like to run it, know that the commonly recommended FOXWELL NT510 elite will not run the procedure on 20-21 year cars. But I discovered through some pretty awesome customer service that the NT710 will run the procedure on those years."
So the NT510 was returned (not working on his year car) but the model NT710 did function properly on 2020 & 2021 year C8 vets.
So the NT510 was returned (not working on his year car) but the model NT710 did function properly on 2020 & 2021 year C8 vets.
Thread Starter
Intermediate
Joined: Jan 2025
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Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
According to Foxwell, yes it will.
They state the NT710, NT909, and NT1009 will all run this flush procedure on the early C8's.
The NT909 is likely the best option as it works on other manufacturers vs just being tied to GM without purchasing additional licenses.
They state the NT710, NT909, and NT1009 will all run this flush procedure on the early C8's.
The NT909 is likely the best option as it works on other manufacturers vs just being tied to GM without purchasing additional licenses.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
I already have a clone unit which I have used to run the flush procedure once to verify it worked.
Today I received in this NT710. I'm still waiting for the adapter (serial to OBDII) to arrive though. My plan was to do my DCT filter and fluid this weekend, so I'll try with the Foxwell unit. The above video didn't show me much of anything, I can't seem to read anything on the screen so I'll make one of my own.
Today I received in this NT710. I'm still waiting for the adapter (serial to OBDII) to arrive though. My plan was to do my DCT filter and fluid this weekend, so I'll try with the Foxwell unit. The above video didn't show me much of anything, I can't seem to read anything on the screen so I'll make one of my own.
Safety Car
Joined: Nov 2012
Posts: 3,978
Likes: 2,595
From: Gettysburg PA
2020 C8 of the Year Finalist - Unmodified
I already have a clone unit which I have used to run the flush procedure once to verify it worked.
Today I received in this NT710. I'm still waiting for the adapter (serial to OBDII) to arrive though. My plan was to do my DCT filter and fluid this weekend, so I'll try with the Foxwell unit. The above video didn't show me much of anything, I can't seem to read anything on the screen so I'll make one of my own.
Today I received in this NT710. I'm still waiting for the adapter (serial to OBDII) to arrive though. My plan was to do my DCT filter and fluid this weekend, so I'll try with the Foxwell unit. The above video didn't show me much of anything, I can't seem to read anything on the screen so I'll make one of my own.
It would be GREAT if you video can capture the sound too when it goes up and down between idle and 2000 rpm.... Also if you can capture a shot of the tool's screen with the tachometer in the background during the test.
So the NT710 doesn't come with a ODBII connector???
Thanks !!!
Last edited by Strake; Feb 20, 2025 at 10:58 AM.
Racer
Joined: Aug 2020
Posts: 412
Likes: 219
From: San Diego, CA
Serial to OBD cable connector
NT710 unit serial plug on one end & an OBD car connector on the other...
Racer
Joined: Aug 2020
Posts: 412
Likes: 219
From: San Diego, CA
Blurry video
Sorry for the lack of sound, phone was connected to the car while I did this. Side note video seems very blurry on the forums. It should be much more legible on YouTube.com
https://youtube.com/shorts/C_RTG0Yfx...r5pH6R9KJXFLto
https://youtube.com/shorts/C_RTG0Yfx...r5pH6R9KJXFLto
Safety Car
Joined: Nov 2012
Posts: 3,978
Likes: 2,595
From: Gettysburg PA
2020 C8 of the Year Finalist - Unmodified
Jacques, are you planning on doing the DCT flush anytime in the coming months? If so, will you also see if the tool will do the "Leak Test"? that happens after the Flush procedure?
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Racer
Joined: Aug 2020
Posts: 412
Likes: 219
From: San Diego, CA
The Big Plans of Mice & Men
Yup, and hopefully I won't now need to visit my over-priced dealer repair shop. The 2020 C8 needed such a tool to properly take care of the DCT so let's make good use of it.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
What year car do you have? Looking forward to watching your video as I couldn't see much from the earlier posted one either. Will you also be planning on doing the Leak Test after the flush procedure?
It would be GREAT if you video can capture the sound too when it goes up and down between idle and 2000 rpm.... Also if you can capture a shot of the tool's screen with the tachometer in the background during the test.
So the NT710 doesn't come with a ODBII connector???
Thanks !!!
It would be GREAT if you video can capture the sound too when it goes up and down between idle and 2000 rpm.... Also if you can capture a shot of the tool's screen with the tachometer in the background during the test.
So the NT710 doesn't come with a ODBII connector???
Thanks !!!
**UPDATE**
Unlike @Pandorasback, the Foxwell NT710 unit DID NOT WORK FOR ME
2021 C8 w/ Z51
The NT 510 failed to even show the transmission procedures, the NT 710 does. It follows the same screens as my clone unit does. Unfortunately it does not execute the procedure.
For now I'll post up the pictures, but I was recording a video and just stopped when I started getting the error.
Background:
I have a clone unit to mimic the BOSCH setup and I have run this procedure previously (about a month ago) in anticipation of changing my filter and fluid (I will be changing fluid yearly due to track time per year - please no comments on gm maintenance cycles). My clone unit works just fine. I tired today (2/21/2025) to run this procedure on the NT710 and it's very similar to my clone unit. It won't start the procedure until the trans temperature indicated 160*F or higher. I understand the gm service manuals say it should be lower temp, but this is the reality.
After the trans temp has been reached, it asks you to depress the brake, then shift the car into Neutral... and then this error in the picture above.
I'd love to understand how this seemed to work for @Pandorasback and what model year indeed they have.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
Turns out mine did as well... not sure what this extra dongle is from the Amazon order, but I've got something extra.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
OK... so I drained my fluid and might not fill things back up until tomorrow as I'm working on making the access door mod as well.
Anyway, I went back and watched @Pandorasback video on Youtube and I notice his software version (top left) shows GM 05.05.002 and his device indicated the procedure would take 10 minutes. Mine device is software version GM 05.04.003 and the procedure indicated (I watched my video that I haven't posted) that it would take 30s which I knew wasn't correct.
So... I'm going run the procedure tomorrow after updating the software version. I wasn't interested in making an account on the device, but looks like I'll have to in order to update it. So, once I've got DCT and Oil back in the car (changing both today) I'll check the NT 710 out again.
Anyway, I went back and watched @Pandorasback video on Youtube and I notice his software version (top left) shows GM 05.05.002 and his device indicated the procedure would take 10 minutes. Mine device is software version GM 05.04.003 and the procedure indicated (I watched my video that I haven't posted) that it would take 30s which I knew wasn't correct.
So... I'm going run the procedure tomorrow after updating the software version. I wasn't interested in making an account on the device, but looks like I'll have to in order to update it. So, once I've got DCT and Oil back in the car (changing both today) I'll check the NT 710 out again.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
I updated all service packages on the NT 710 and I'm now at GM 05.05.002 as @Pandorasback is in their video.
Today I finished my fills (oil and DCT) and went to conduct the DCT leak test via the NT 710. No go again... this device IS NOT WORKING on my 2021 C8.
I unplugged the NT 710, hooked up my laptop and my clone unit, and ran the leak test without issue.
Not sure what the differences are, but at this point is buyer beware (as you might have to return it).
Today I finished my fills (oil and DCT) and went to conduct the DCT leak test via the NT 710. No go again... this device IS NOT WORKING on my 2021 C8.
I unplugged the NT 710, hooked up my laptop and my clone unit, and ran the leak test without issue.
Not sure what the differences are, but at this point is buyer beware (as you might have to return it).
Last edited by rlhammon; Feb 22, 2025 at 04:35 PM. Reason: Fixed typo from "not" to "now"
Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
I updated all service packages on the NT 710 and I'm not at GM 05.05.002 as @Pandorasback is in their video.
Today I finished my fills (oil and DCT) and went to conduct the DCT leak test via the NT 710. No go again... this device IS NOT WORKING on my 2021 C8.
I unplugged the NT 710, hooked up my laptop and my clone unit, and ran the leak test without issue.
Not sure what the differences are, but at this point is buyer beware (as you might have to return it).
Today I finished my fills (oil and DCT) and went to conduct the DCT leak test via the NT 710. No go again... this device IS NOT WORKING on my 2021 C8.
I unplugged the NT 710, hooked up my laptop and my clone unit, and ran the leak test without issue.
Not sure what the differences are, but at this point is buyer beware (as you might have to return it).
Melting Slicks
Joined: Aug 2017
Posts: 2,193
Likes: 2,203
From: Massachusetts
Thanks to all for the information sharing.
Just want to share something I learned.
I have the Foxwell NT630 Elite. I bought it around 2018.
Foxwell advertises lifetime free updates to the scanner.
Lifetime for them is the period in which they make the scanner model.
My NT630 Elite is no longer supported and Foxwell recommends I purchase the newer NT630-Pro.
Foxwell scanners are still good deals but remember what "Lifetime" means to the company.
Best wishes to all, spring is on the way...
Just want to share something I learned.
I have the Foxwell NT630 Elite. I bought it around 2018.
Foxwell advertises lifetime free updates to the scanner.
Lifetime for them is the period in which they make the scanner model.
My NT630 Elite is no longer supported and Foxwell recommends I purchase the newer NT630-Pro.
Foxwell scanners are still good deals but remember what "Lifetime" means to the company.
Best wishes to all, spring is on the way...
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
The leak test seems to run a shortened version (was 2 minutes) of the Flush procedure IMO. The updates were the same, ran through each solenoid at ~2 min total runtime. It's in the gm procedure to run it after the fill, so I did.
Safety Car
Joined: Nov 2012
Posts: 3,978
Likes: 2,595
From: Gettysburg PA
2020 C8 of the Year Finalist - Unmodified
Thanks for reporting your disappointing findings....... had you had success, I'd feel confident in buying one. Guess I'll sit tight a while longer.....
If anything changes, or if other find that it works on a 2020, 2021 or 2022 please let us know.
thanks !
If anything changes, or if other find that it works on a 2020, 2021 or 2022 please let us know.
thanks !
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
So far in this thread its 2 to 1 saying it works vs. it doesn't.
Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
So... what's the differences between our cars that it works for you and not for me (more hypothetical I don't expect you to have the answer)
The leak test seems to run a shortened version (was 2 minutes) of the Flush procedure IMO. The updates were the same, ran through each solenoid at ~2 min total runtime. It's in the gm procedure to run it after the fill, so I did.
The leak test seems to run a shortened version (was 2 minutes) of the Flush procedure IMO. The updates were the same, ran through each solenoid at ~2 min total runtime. It's in the gm procedure to run it after the fill, so I did.