Im pretty sure it hasn't been added in yet, but i think the code has something to do with the temperature thing at death valley
Thx for answering:)
Hey Sparks! I FOUND AN ANSWER. if you complete all the side quests at the end, and go to the beach, defeat the gaurdians and follow the car<ahem shooting star , you can go in
WOW TYSM!!!
No problem:3!