[Mikkel_Pedersen]

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (strcmp("/up", cmdtext, true, 10) == 0)
    {
            MoveObject(elevator, 2898,-2657.30175781, 45.42610168,0.97);//elevator goes up
            SendClientMessage(playerid, 0xFF8000FF, "<Elevator> The elevator is going up!");
            return 1;
    }
    if (strcmp("/down", cmdtext, true, 10) == 0)
    {
        MoveObject(elevator, 2898,-2657.30175781, 6.04528284,0.97);//Elevator goes back down.
        SendClientMessage(playerid, 0xFF8000FF, "<Elevator> The elevator is going down!");
        return 1;
    }
    return 1;
}

I assume you already defined the elevator.