Below is a list of all unlock codes. Some of these could be provided in game by completing challenges, others were provided online during the course of a contest.

Rubicon Trail: BUNK OCCUR LION Jeep Willys MB: BAND OF BROTHERS Light Bar: A GELABLE THRIPS Skid Plates: SNAKE SLIDE I'D PET Moab Trail: COLA NUMB OK Grand Cherokee: A DOCK REFER GENE HER Winch: CAVEMEN WHIG I No Brush Damage: MANA HERB DUG SO Silverton Pass: NOVICE SUNK TROLL Wrangler Rubicon: GUM BORIC EVEN Liberty: A REPTILE BE SLY Electronic Control Module: ECLECTIC DELL MORTON ON OUR Bikini: BAIL IKE SPINE