pcmhacking.net

I tried poking around to see, didn't find one. I know HPT has this stuff layed out but EFILive does not, was hoping to find it here but have not yet. I'm looking to keep the TCC locked in a 4L80 application when you lift off the throttle, helps a lot with maintaining speed going downhill when DFCO kicks in. I pulled the tune in my 12212156 based COS5 P01 PCM in my dually, same OS I'm using in another truck. I was able to get someone to enable that for me eons ago, but I would like to be able to have that control myself if there's an XDF floating around out there.

I hope this is helpful; I found in some fairly lengthy forum posts in the HPT forum archives where there were a large number of requests for this to be supported in HPT. Apparently the requests were numerous enough to get it moved to the front burner and they did add it for a very limited number of PCM's (I think the P01 'may' have been one but I'm not certain). Support for P04's (which are the PCMs that I use) were never added. Take a look at the attached document that they apparently published for supporting the few PCMs which support was added for TCC to remain on when coasting. I think that posts in the archived forum indicated that the folks who benefitted from it said it worked for them.

Yep HPT has this shown (general release parameters not related to gears but TPS and speed) and I don't see these parameters in Tunerpro and UP

If you have the a read of a bin where it is changed and stock you should be able to compare them side by side to narrow down where the changes are. If you can see the data that changed in HPT as well you should be most the way to figuring out where the change is by looking for larger or smaller numbers and think about the equations you are going to need, then it needs to go in the 12212156 XDF.

It sounds a little bit odd if its only in a couple of OSs, it could be a code patch rather than a calibration item, so if that is the case then it would be harder, but not impossible to port to other operating systems and keeping operating system checksums (and plugins for tunerpro) in mind.