Black plate (21,1)Cadillac CTS/CTS-V Owner Manual - 2013 - CRC - 4/18/12Instruments and Controls 5-21or 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 Recommended Fuel onpage 9‑48.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 next to 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 light does not come on whenthe ignition is turned to ON/RUNwhile the engine is off. See yourdealer for assistance in verifyingproper operation of themalfunction indicator 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 IIsystem readiness, your dealercan prepare the vehicle forinspection.Brake System WarningLightThe vehicle brake system consistsof two hydraulic circuits. If onecircuit is not working, the remainingcircuit can still work to stop thevehicle. For normal brakingperformance, both circuits need tobe workingIf the warning light comes on, thereis a brake problem. Have the brakesystem inspected right away.