Service Theft System Message on 2003 Cadillac DeVille

My vehicle is telling me to service theft system and is weak starting. Can I repair at a local shop or at a Cadillac dealer only. Est cost of repair?

Asked by for the 2003 Cadillac DeVille
A 2003 car is old enough that any independent repair shop that specializes in Cadillac or GM will have the appropriate tools to diagnose and fix your car's problem.