Black plate (19,1)Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-7707485) -2015 - CRC - 10/31/14Instruments and Controls 5-19{ CautionIf the vehicle is continually drivenwith this light on, the emissioncontrols might not work as well,the vehicle fuel economy mightnot be as good, and the enginemight not run as smoothly. Thiscould lead to costly repairs thatmight not be covered by thevehicle warranty.{ CautionModifications made to the engine,transmission, exhaust, intake,or fuel system of the vehicle orthe replacement of the originaltires with other than those of thesame Tire Performance Criteria(TPC) can affect the vehicle'semission controls and can causethis light to come on.Modifications to these systems(Continued)Caution (Continued)could lead to costly repairs notcovered by the vehicle warranty.This could also result in a failureto pass a required EmissionInspection/Maintenance test. SeeAccessories and Modifications onpage 10-3.This light comes on during amalfunction in one of two ways:Light Flashing: A misfire conditionhas been detected. A misfireincreases vehicle emissions andcould damage the emission controlsystem on the vehicle. Diagnosisand service might be required.To prevent more serious damage tothe vehicle:. Reduce vehicle speed.. Avoid hard accelerations.. Avoid steep uphill grades.. If towing a trailer, reduce theamount of cargo being hauled assoon as it is possible.If the light continues to flash, stopand park the vehicle. Turn thevehicle off, wait at least 10 seconds,and restart the engine. If the light isstill flashing, follow the previoussteps and see your dealer forservice as soon as possible.Light On Steady: An emissioncontrol system malfunction hasbeen detected on the vehicle.Diagnosis and service might berequired.The following may correct anemission control systemmalfunction:. Make sure the capless funneladapter is removed, if fuel hasbeen added to the vehicle usingthe capless funnel adapter. See“Filling the Tank with a PortableGas Can” under Filling the Tankon page 9-61. The diagnosticsystem can detect if the adapterhas been left installed in the
