Cadillac 2011 DTS Owner's Manual

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Black plate (55,1)Cadillac DTS Owner Manual - 2011Malfunctions often are indicated by the system beforeany problem is apparent. Being aware of the light canprevent more serious damage to the vehicle. Thissystem 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 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 system ofthe vehicle or the replacement of the original tireswith other than those of the same Tire PerformanceCriteria (TPC) can affect the vehicle's emissioncontrols and can cause this light to come on.Modifications to these systems could lead to costlyrepairs not covered by the vehicle warranty. Thiscould 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 vehicle off, wait at least 10 seconds, andrestart the engine. If the light is still flashing, follow theprevious steps and see your dealer for service as soonas possible.Light On Steady: An emission control systemmalfunction has been detected on the vehicle.Diagnosis and service might be required.An emission system malfunction might be corrected bydoing the following:. Make sure the fuel cap is fully installed. See Fillingthe Tank on page 6‑8. The diagnostic systemcan determine if the fuel cap has been left off orimproperly installed. A loose or missing fuel capallows fuel to evaporate into the atmosphere. A fewdriving trips with the cap properly installed shouldturn the light off.4-55