Hello GTPprix...I bought a 2009 CTS DI about two months ago..after about a week of driving it the ticking sound appreared, and hasn't stopped since. I have a panic disorder and the thought of owning this car for another 3 years and dealing with this sound, causes my problem to flare up each time I drive this ticking time bomb. Can you offer any solution or advise to get this fixed? I love this car, but can't take the stress it causes me to even sit in it. I did take it take to the dealer and was told it was normal, and there wasn't anything they could do. Please help!