General Motors (GM) is warning customer’s of certain 2013 Chevrolet Sonic vehicles about a problem that could leave drivers unaware that their turn signals are not functioning. When a turn signal lamp fails to operate, the Body Control Module (BCM) is suppose to detect the condition and warn the driver of the problem. A programing error in the BCM system may fail to warn the driver and if the problem goes unfixed, other drivers will not know that the vehicle is turning. This could increase the risk of an accident. Owners wanting more information can contact the Chevrolet owner center at 1-866-694-6546.