- Dec 4, 2011
- 568
My search-fu is failing badly right now. I've run across some threads mentioning that several people have successfully converted their P10 to a P12 PCM, but I can't seem to find the discussions of HOW it was done. Can anyone point me in the right direction?
The basis of this search is that I recently converted my axles to 4.10 gears. My local dealership has been calling the GM tech line, and GM is insisting that there is no info in their system to build a new PCM for my body style (2004 TB LT, SWB), even though they do agree that it was an available factory option. I've been chasing this problem for about a month now, and still have made no progress in getting it resolved.
So a couple of questions about this, that maybe someone can answer? Just HOW different is the code between each vehicle? GM makes it sound like they have to write custom software for each individual vehicle based on all the installed options, however I thought the PCM simply controlled the powertrain, and all of these vehicles (02-05) have the same I6 installed. How does someone like PCM4Less send me a generic PCM and have it "just work"? Could I actually find another PCM from the same year/body that was programmed for the 4.10 gears, change the VIN with HPTuners, and have it work?
And moving forward with my original question, if I upgraded to a P12, which does have all the options available in HPT for setting the gears and adjusting the speedometer, would I have to get any special programming done on it to work with my older vehicle, or could I simply drop it in (after changing connectors of course), update the VIN, and it would work? Considering the amount of time I've put into this already, and the lack of drivetrain support for the P10, I'm really thinking a conversion might be the preferred way to go (assuming there aren't any *gotchas* that I'm not aware of).
The basis of this search is that I recently converted my axles to 4.10 gears. My local dealership has been calling the GM tech line, and GM is insisting that there is no info in their system to build a new PCM for my body style (2004 TB LT, SWB), even though they do agree that it was an available factory option. I've been chasing this problem for about a month now, and still have made no progress in getting it resolved.
So a couple of questions about this, that maybe someone can answer? Just HOW different is the code between each vehicle? GM makes it sound like they have to write custom software for each individual vehicle based on all the installed options, however I thought the PCM simply controlled the powertrain, and all of these vehicles (02-05) have the same I6 installed. How does someone like PCM4Less send me a generic PCM and have it "just work"? Could I actually find another PCM from the same year/body that was programmed for the 4.10 gears, change the VIN with HPTuners, and have it work?
And moving forward with my original question, if I upgraded to a P12, which does have all the options available in HPT for setting the gears and adjusting the speedometer, would I have to get any special programming done on it to work with my older vehicle, or could I simply drop it in (after changing connectors of course), update the VIN, and it would work? Considering the amount of time I've put into this already, and the lack of drivetrain support for the P10, I'm really thinking a conversion might be the preferred way to go (assuming there aren't any *gotchas* that I'm not aware of).