I don't think this is something you want to try to fix. One wrong move and you could set off the air bag working on the wheel and that could injure you and possible cause a fatality. The air bag is like a hand grenade if it goes off uncontrollable. Sounds like maybe something is loose? Fyi-I had a CTS V6 loaded with every option including premium red paint and it was nothing but problems from the very first day I had it. Mostly all electronic stuff but when the dealer service manager told me I needed new struts at only 23,000 miles, I traded it in on a 2009 AWD soon after. The 2009 is going on 20,000 miles and 3yrs and had not had any problems.