What is the elite pass code for warhammer 4000 space marines

I am assuming you bought it used because it would have come with it if you had bought it new. Its essentially an online pass, a way for game makers to get some money from used games because they don't see any money from used game sales. If you go on the xbox market place or Playstation network store and search elite pass or something than you should find it, buy it for like 5 dollars i think and than you can play online multiplayer and swarm mode.