VOLUNTARY EMISSIONS SERVICE CAMPAIGN: 2.4L GDI AUXILIARY CANISTER KIT INSTALLATION (SC234) - This bulletin provides the procedure for the installation of an add-on auxiliary canister on some 2016-2018MY Sorento (UMa) vehicles equipped with the 2.4L GDI engine, produced from November 4, 2014 through March 7, 2018. This is to improve the evaporative system and ensure compliance with Federal and California emission regulation standards.