Heat oven to 350°. *Spray a 9x9 pan with non-stick spray.
In large bowl, beat cake mix, pumpkin, and pumpkin pie spice with electric mixer on low speed until moistened and forms a batter, scraping bowl occasionally.
Spread batter into pan. (Batter will be thick and it won't seem like you will have enough batter, but it does raise.)
Bake 30-40 minutes until a toothpick inserted comes out clean.
Let cool for about 10 minutes after baking. Using the bottom of a wooden spoon, poke holes all over on the top of the cake.
Pour the sweetened condensed milk over the cake, filling in all the holes until gone.
Take the caramel sauce and pour or squirt some caramel into each of the holes on the cake. Don't go overboard, a little goes a long way.
Pour the instant pumpkin pudding into a bowl and add your milk of choice and whisk together well.
Pour pudding over sweetenened condensed milk and caramel layer of cake spreading evenly on top of the cake.and refrigerate for 30 minutes.
Spread the Cool Whip over the top of cake.
Sprinkle the Heath bits and pecans over the Cool Whip, then drizzle some caramel on top of that.
Refrigerate for 4 hours, or overnight.
Store cake loosely covered in refrigerator.