{"nhtsa_id":10089322,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-01-23","date":"2016-06-29","document_id":"15823 LETTER","mfr_campaign":null,"replaces":null,"component":"FUEL SYSTEM, GASOLINE:STORAGE:AUXILLARY TANK","mfr_system":null,"summary":"15823 - CUSTOMER ADVISORY LETTER. THIS COMMUNICATION WAS TO INFORM DEALERS THAT A CUSTOMER MAILING WAS TAKING PLACE. THE LETTER INFORMS THE CUSTOMERS TO INSPECT FOR LEAKS OR DAMAGE TO THE FUEL FILLER NECK LINE AND/OR THE CARGO TANK HIGH PRESSURE FLEX LINES. TO ADDRESS THIS POTENTIAL CONDITION, CUSTOMERS ARE INSTRUCTED TO HAVE A CERTIFIED CNG TECHNICIAN INSPECT THE FUEL FILLER NECK LINE AND THE CARGO TANK HIGH PRESSURE FLEX LINE IN ACCORDANCE WITH GM SERVICE INFORMATION PROCEDURES. IN ADDITION, TO BE SURE THE CUSTOMER’S VEHICLE DOES NOT HAVE THIS CONDITION, CUSTOMERS ARE ALSO INSTRUCTED TO CONTINUE INSPECTIONS ANNUALLY AS PART OF ROUTINE MAINTENANCE. GM HAS UPDATED THE MAINTENANCE SCHEDULE IN THE CNG VEHICLES OWNER’S MANUAL SUPPLEMENT TO INCLUDE AN ANNUAL INSPECTION OF ALL CNG FLEX LINES.","document":null,"url":"https://open.wenmarpro.com/bulletins/10089322","components":[{"id":"fuel-system","name":"Fuel system","parent":null}],"codes":[],"topics":["maintenance"],"vehicles":[{"make":"CHEVROLET","model":"EXPRESS","year_from":2011,"year_to":2014,"match":"exact","vehicle_ids":["2011_chevrolet_express","2012_chevrolet_express","2013_chevrolet_express","2014_chevrolet_express"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}