Cadillac 2010 DTS Owner's Manual

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If the check engine light comes on and stays on, whilethe engine is running, this indicates that there is anOBD II problem and service is required.Malfunctions often are indicated by the system beforeany problem is apparent. Being aware of the lightcan prevent more serious damage to the vehicle.This system assists the service technician in correctlydiagnosing any malfunction.Notice: If the vehicle is continually driven with thislight on, after a while, the emission controls mightnot work as well, the vehicle's fuel economy mightnot be as good, and the engine might not run assmoothly. This could lead to costly repairs thatmight not be covered by the vehicle warranty.Notice: Modifications made to the engine,transmission, exhaust, intake, or fuel systemof the vehicle or the replacement of the originaltires with other than those of the same TirePerformance Criteria (TPC) can affect the vehicle'semission controls and can cause this light to comeon. Modifications to these systems could lead tocostly repairs not covered by the vehicle warranty.This could also result in a failure to pass a requiredEmission Inspection/Maintenance test. SeeAccessories and Modifications on page 6‑3.This light comes on during a malfunction in one oftwo ways:Light Flashing: A misfire condition has been detected.A misfire increases vehicle emissions and coulddamage the emission control system on the vehicle.Diagnosis and service might be required.To prevent more serious damage to the vehicle:. Reduce vehicle speed.. Avoid hard accelerations.. Avoid steep uphill grades.. If towing a trailer, reduce the amount of cargobeing hauled as soon as it is possible.If the light continues to flash, when it is safe to do so,stop the vehicle. Find a safe place to park the vehicle.Turn the key off, wait at least 10 seconds, and restartthe engine. If the light is still flashing, follow theprevious steps and see your dealer for service assoon as possible.4-56