08 g8 gt with 6l80 from 2014 ppv

[08g8gtrentdgaf]

I brought a bad 6l80 from a 14 caprice (tag 4cpa) had it rebuilt installed and now it won?t shift or go into manual mode. Was wondering if hpt could help with this issue.

[5FDP]

If the TCM is different, that could be a reason why. The current calibration wouldn't be programmed for that TCM.

[Tre-Cool]

2014 tcm os is not compatible with an early 08 ecu os. your gonna need to swap the techm.

[08g8gtrentdgaf]

Is that my only option? Am I able to get it reprogrammed at the dealership or something?

[TransGo Robert]

Both the TEHCM and the valve body are different and incompatible with a 2008. You will need to swap those two to make it work.

[Alvin]

Is that my only option? Am I able to get it reprogrammed at the dealership or something?

I've been able to write entire T43's with no issue. Others have commented they've been able to do the same. This is not the case with any ECM. But the TCM's seem to work OK like that.

[08g8gtrentdgaf]

I've been able to write entire T43's with no issue. Others have commented they've been able to do the same. This is not the case with any ECM. But the TCM's seem to work OK like that.

Could you possibly walk me thru the steps? I’m new to this and still learning. Anything I need to change?

[Alvin]

It's as simple as opening a file that you want.. and flashing. You can choose to skip the ECM but choose WRITE ENTIRE for TCM

This is assuming the TCM/valve body is the same. I'm not sure about that but I'm reading a post above that makes me question that they might be different.

[08g8gtrentdgaf]

Went to have it reprogrammed and it thru 2 codes e2907 and e4398. At this point I’m a scrap the car

[5FDP]

I'll bring my trailer by.