Yes i called XDP where i got from and they said it was the truck because i tried that bully dog try before you buy and it has corrupted my pcm. So i took it to the dealership and paid 75.00 bucks to reflash it. then i get home and try it again and it did the samething as before. heres is what the box say's on it, it is a SF PCM FLASH TOOL SF STRATEGY FLASH DEVICE and at the bottom of the front it says 1999+Vehicles only not applicable for Diesels. So the way i read it, it will not work on diesels. I called XtremeDiesel who i purchased it and they said send it back because it sounds like this unit must be blank no programs on it and they want me to pay for a the shipping back to them then back to me and i told them thats not right if this sct is blank or where is says at the bottom not for diesels thats not my fault not very good customer support in my opinion, i half to spend 20.00 to send it back and i got !!!! is there anyone out there that sells these with good support and trust. Sorry for venting but i am diabled on fixed income and 20.00 is alot to me. Thanks everyone on this site for the help here. Frank