hi guys. i have an 06 5.9 cummins. i just bought it new. i also bought a bully dog downloader. I used it on tow for 2 days. ran great. then i felt it was not making a power difference. i put it to stock while at work. I drove home normal. i got home and set it back on tow. after completing this i started it. it died. did this twice. now it wont run have the 2 codes. The bully dog wont let me go to stock or anything. it thinks it been used on a different car. does not recognize vin.
any way to fix this? bring it back to stock?
please help any suggestions?
thanks