
Today's GM automobiles use many sensors, switches, solenoids, and other electric components to regulate or monitor every part of the engine. From controlling the ignition systems and fuel to monitoring the emissions. A difficulty in any of these systems, or subsystems, could cause the check engine light to come on. If the engine light is flashing, this is an indication of an engine misfire that's bad enough to imply damage the the catalytic converter. This could be looked into as quickly as possible since replacing of this element can be really costly.