Black plate (20,1)Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-7707485) -2015 - CRC - 10/31/145-20 Instruments and Controlsvehicle, allowing fuel toevaporate into the atmosphere.A few driving trips with theadapter removed should turn offthe light.. Check that good quality fuel isused. Poor fuel quality causesthe engine not to run asefficiently as designed and maycause stalling after start-up,stalling when the vehicle ischanged into gear, misfiring,hesitation on acceleration,or stumbling on acceleration.These conditions might go awayonce the engine is warmed up.If one or more of these conditionsoccurs, change the fuel brand used.It may require at least one full tankof the proper fuel to turn the light off.See Fuel on page 9-59.If none of the above have made thelight turn off, your dealer can checkthe vehicle. The dealer has theproper test equipment anddiagnostic tools to fix anymechanical or electrical problemsthat might have developed.Emissions Inspection andMaintenance ProgramsDepending on where you live, yourvehicle may be required toparticipate in an emission controlsystem inspection and maintenanceprogram. For the inspection, theemission system test equipment willlikely connect to the vehicle's DataLink Connector (DLC).The DLC is under the instrumentpanel to the left of the steeringwheel. See your dealer if assistanceis needed.The vehicle may not passinspection if:. The malfunction indicator lamp ison with the engine running, or ifthe vehicle is placed in ServiceOnly Mode and the malfunctionindicator lamp does not comeon. See your dealer forassistance in verifying properoperation of the malfunctionindicator lamp.. The OBD II (On-BoardDiagnostics) system determinesthat critical emission controlsystems have not beencompletely diagnosed. Thevehicle would be considered notready for inspection. This canhappen if the 12-volt battery hasrecently been replaced or rundown. The diagnostic system isdesigned to evaluate criticalemission control systems duringnormal driving. This can takeseveral days of routine driving.If this has been done and thevehicle still does not pass theinspection for lack of OBD II
