RepairPal Certified shops can diagnose and repair your 2007 Cadillac CTS. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
i have 2006 cadillac cts my car is in shop for this now, it could have been gas cap, dealership says mine is purge dolenoid, charging me $95 to repair, hope this helped.