There is no way to know without scanning the modules and diagnosing the problem. This could be any number of problems. If you would like to bring the vehicle to us we can definitely diagnose the problem. Feel free to call us, my name is Scott from Schaumburg Automedics at 503 Lunt Ave. Schaumburg 60193.
RepairPal Certified shops can diagnose and repair your 2008 Chevrolet Trailblazer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.