Don't know what year Buick were talking about so about all I can say is most likely your GM PassLock system has issues.
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2006 Toyota Tundra, 2007 Corvette, 2009 Scion TC,
2001 KTM 380EXC, 2005 Yamaha FZ1, 2006 Honda 919, 2013 Honda CRF250L, 2013 Yamaha FZ6R