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Mix the Coke, Heinz chili sauce (you can find it in the condiment aisle of the grocery store) and dry onion soup mix in a bowl.
You'll want to trim the fat on the brisket, leaving only about 1/4 inch on top.
Put the brisket into a large baking pan and pour the Coke-chili sauce mixture over top. (If you use a larger piece of brisket, or the whole brisket you may need to double the sauce mixture.)
Tightly cover the pan with aluminum foil.
Start the Traeger on Smoke with the lid open until the fire is established, 4 to 5 minutes. Close the lid and preheat the Traeger to 300 degrees F for about 10 to 15 minutes.
Put the pan of brisket on the grill and cook for 3 to 4 hours or until the brisket is tender. (Stick a fork in it and when it twists with little effort, it's ready!)
Let the brisket rest, covered in its juices for 30 minutes to an hour before you slice her up and serve.