Thread: 05 Pontiac gtp comp g tune will read file but not tune???

Originally Posted by Scottydoggs

in the drop box is a pcm compatibility list, may sure the part number will work on a 04 and 05, they might not cross over.

I don't know about the comp g because of the transmission, but the 04 gtp file works fine for the 05. Also 05 isn't technically supported in DHP. I've been finding a Lot of things different from the 04 vs the 05. BTW, I bricked 3 PCMs before building my offboard adapter.