I had the same problem, I had to get towed to the dealer, they discovered my instrument cluster had gone bad. Sorry. Oh it does not matter what code you put in, if you were to activate the code, you put it in then shut the X off. Also if you want to play with it, it is easy to disconnect the siren, one loosened bolt and one disconnect. I spent hours on this and went through all of the 4 digit numbers. Still towed to the dealer.

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08 GMC Acadia
08 328i Titanium Silver