same here, my dad loaded the tow tune in his OBS dually before a trip to florida. Got there, and he decided to switch it around to see what kinda mpg he got on the way back home. And, it was vin locked :hehe:I've got one of those 1705 POS tuners, I only trust it as a code reader now. IT ACTUALLY VIN LOCKED ME OUT OF TUNING ON MY OWN TRUCK!!!!! Only used it on the OBS, never the other truck. Sent it back twice in a year to be fixed under warranty, still had to pay shipping....crap. Now I'm not even sure if my trucks stock tuning is really stock anymore.