Pre-heat oven to 350F. Grease and flour 3 (9-inch) round cake pans. Combine cake mix, pumpkin, eggs and butter in large bowl; beat with electric mixer at medium speed 2 minutes. Divide batter evenly among prepared pans. Bake 20-25 minutes or until toothpicks inserted into centers come out clean. Cool 5 minutes on wire racks; remove from pans and cool completely.
Place one cake layer on serving plate; cover with frosting. Repeat layers, ending with frosting. Frost side of cake. Spread caramel topping over cake, letting some caramel drip down side. Garnish with pecan halves.