I can't tune mine and bill at hptuners claim they are working on a fix but I don't see it being a priority for them. I also tried tuning another 07 and it would not work either. I don't have any aftermarket item to effect it working. Wish I had not purchased it now since it will not work.I don't know if anyone has had issues but I can not tune my truck with HPtuners. The 07 Colorado, canyons, and hummers have bugs. Does anyone know a solution to this problem????