KTuner.com

Hey JR, long time.... Hey I went to the website because Ktuner pop up said a newer version was available. After it downloaded and installed, My car wouldnt start. Just cranked and no start. I went back to the version I had installed previously. Started right up. Any Ideas?

Changing software versions can't alter the way the vehicle runs. Only uploading can. In either case it would be a setting preventing startup, like immobilizer for instance.