Sounds to me like your account is not being activated properly. Did you call Sirius and give them your ESN to start your free one-year subscription for this vehicle (i.e. there's no confusion with a prior vehicle subscription)?
When my car was delivered, all the sat radio channels were available (and could be stored as presets). I assumed that the dealer had activated the subscription for me. A few days later, all the sat presets disappeared. Turned out that Sirius happened to offering one of those free trial periods when I took delivery. I called and activated my one-year subscription and all my presets reappeared.