Ok not to sound dumb, but I am a female here, how do I know if my car is ULF or TCU?

I have no idea what that is.

ps- the PK code on my card is 4 digits but no luck. I am hoping that it is something simple like the code is wrong.

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Denise

2005 X5 3.0 Alpine White/Truffle Leather
2006 Porsche Cayenne S/Black