Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-9235592) -2016 - crc - 11/6/15132 Instruments and ControlsIf a short distance must be drivenwith the light on, be sure to turn offall accessories, such as the radioand air conditioner.Malfunction IndicatorLamp (Check EngineLight)This light is part of the vehicle’semission control on-boarddiagnostic system. If this light is onwhile the engine is running, amalfunction has been detected andthe vehicle may require service. Thelight should come on to show that itis working when the ignition is inService Only Mode. See IgnitionPositions 0 202.Malfunctions are often indicated bythe system before any problem isnoticeable. Being aware of the lightand seeking service promptly whenit comes on may prevent damage.CautionIf the vehicle is driven continuallywith this light on, the emissioncontrol system may not work aswell, the fuel economy may belower, and the vehicle may notrun smoothly. This could lead tocostly repairs that might not becovered by the vehicle warranty.CautionModifications to the engine,transmission, exhaust, intake,or fuel system, or the use ofreplacement tires that do notmeet the original tirespecifications, can cause this lightto come on. This could lead tocostly repairs not covered by the(Continued)Caution (Continued)vehicle warranty. This could alsoaffect the vehicle’s ability to passan Emissions Inspection/Maintenance test. SeeAccessories andModifications 0 262.If the light is flashing : Amalfunction has been detected thatcould damage the emission controlsystem and increase vehicleemissions. Diagnosis and servicemay be required.To help prevent damage, reducevehicle speed and avoid hardaccelerations and uphill grades.If towing a trailer, reduce theamount of cargo being hauled assoon as possible.If the light continues to flash, find asafe place to park. Turn the vehicleoff and wait at least 10 secondsbefore restarting the engine. If thelight is still flashing, follow the
