There’s been discussion on the need to or not to run the DCT flush procedure when doing a DIY DCT filter change.
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.
I purchased the 510 on Amazon, tried the procedure with all parameters met and continued to receive an an error message. I returned the scanner and left a mediocre review. Within a day Foxwells customer service reached out and researched a solution. After refunding me, they fedexed me a 710 at no charge and encouraged me to try again. Excellent customer service, and now a proven way to run the procedure in the older C8s.

 

I should add. My trans temp needed to be 160 degrees to initiate, and if I recall the standard parameter is 140.

 

Not sure about any other years but I have a 510 and it works on my 2024

 

Very interesting. So, if the other information is correct that the early cars need to have the procedure written to the ECU (TCM?) before it can be done, is the NT710 writing the procedure to the ECU?

 

if the 710 works the even higher level units should work as well hey?

 

I have no idea what’s happening on the computer level. I just plugged it in, went to the procedure on a warm trans, shifted to neutral, foot on the brake, and about 5 minutes later voila. If anybody in phoenix has a 510 I’d be willing to plug it in to my car and see if the program is now stored to my car.

 

I would assume that as well. Considering they shipped this thing to me for free, I’m assuming they gave me the cheapest one that would do what I wanted.

 

I believe the program is lost after use (don't know when) and has to be loaded every time if, in fact, that is the issue with using aftermarket scan tools to perform the HSF on the early cars.

 

2020, 2021 and 2022 model years do not have the software preloaded on the vehicle in order to perform this procedure.

 

Based on what he is saying the 710 must have that program onboard then if it worked on his car. If what he is saying is accurate it’s a way cheaper option than buying an MDI2 and having to purchase a 3 day subscription every time you need to run the flush.

 

As I have a NT510, I can confirm that it works on a 24, it will also perform the leak test. And for anyone wondering you do have to keep your foot on the brake the whole eight minutes.

 

If it is writing the procedure to the ECU, isn't that a potential warranty blocking offense?

 

I if it did something that permanently corrupted the programming then I suppose it could. Perhaps that is the reason (faulty programming) the transmission had to be at 160 vs 140 degrees. But since the programming is lost after the flush I doubt it would be a problem. The OEM tool also writes the program to the ECU (if our understanding of how it works is correct).

 

I would think that even if the programming is lost after the procedure, if the ECU history shows having been modified, even temporarily, then that could be a reason to void warranty.

 

But that is also what the OEM programming does if our understanding is correct.

 

This raises lots of interesting questions, with few answers (not profound, I know). Even the assumption the the ECM would keep a history of everything that happened to it can be questioned. I think that while changed or corrupted code could be detected, if code is temporarily written into it, then deleted execution, there may not be a record that it was ever there. In order to maintain a history, the ECM would need extra software to capture and store that info - date, what was done, etc. In another thread it was explained (and I do not know if it was correct) that the reason that earlier models did not include on-board code for the HSF is because the storage capacity of the ECM was limited. Later models purportedly received a different module with more storage space, so the software was included. My point is that if all that is true, then the original ECM was limited, and might not have room for software to record and store history.

Ironic too that folks worry about warranty issues when not running the HSF, but now worry about being discovered that it was run with an aftermarket tool. Go figure.

I have another thought. In the earliest manuals there was no HSF procedure. But there were seven or so individual transmission service cleaning procedures. I wonder if those individual procedures were on board, or could be executed with an aftermarket tool without loading code into the ECM? Its been speculated, but never validated, that the HSF performs those individual procedures in a certain sequence. If that is true, perhaps the tool that works on the earlier models is doing that, rather than downloading code to the ECM. Just speculation.

 

PandorasBack, I would enjoy seeing a video of the procedure using the NT510. What is the text on the scanner that flushes the system thru the filter?

Ron

 

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.

 

Sorry, I meant the NT710. I would like to see the menus and instructions given on the scanner.
I have a Foxwell NT630 Elite that is 10 years old and is no longer supported/updated.

 

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