The player's collar will continue to beep and explode. This must be done before reaching the top of the stairs in the bunker. If using the PC version, a fix would be to use the 'tcl' command and clip into the footlocker (to get your belongings) and then clip into the ladder to leave. A fix for this would be to save before going up the stairs of the bunker and keep loading the save until it works.
If you do not know the load order of Dead Money, attempt '01' through '09' until it does not return an error. To fix this with console, enter 'ResetQuest xx00C543' and 'ResetQuest xx00E882' replacing the 'xx' with the load order number of 'DeadMoney.esm'.PC Xbox 360 If the player saves the game while inside of a toxic cloud, it is possible to continue taking damage from the cloud even after leaving it, and even after completing the DLC and returning to the Mojave.PC Xbox 360 If Dead Money has been completed on one save file and a new game has been started with Dead Money on the new save, it is possible that after waking up and speaking to Elijah, the player can can pass through the gate that leads back to the Mojave Wasteland and return to the bunker.