Combine cake mix, pumpkin, eggs and butter in a large bowl; beat with electric mixer at medium speed for 2 minutes. Divide batter evenly among prepared pans.
Bake 20 to 25 minutes or until toothpick inserted into center comes out clean. Cool cakes for 5 minutes on wire racks. Remove to racks; cool completely.
Place on cake layer on serving plate; cover with frosting. Place second layer on top of first; cover with frosting. Top with remaining cake layer; frost top and side of cake. Spread caramel over top of cake, letting some caramel drip down side. Garnish with pecan halves.