To use cheat codes for Grand Theft Auto V on Xbox 360, press a specific sequence of buttons in-game to unlock the cheat. You can find a complete list of cheat codes for GTA V on Xbox 360 on GameFAQs.com.
Cheat codes for GTA V are sequences of button presses on the Xbox 360 game pad that use input from the directional pad, the face buttons, and the left and right triggers. You do not need to be in a menu to enter these codes; simply enter the sequence during normal gameplay. Keep in mind that you cannot earn Xbox Live achievements while using cheat codes.