{"nhtsa_id":10083711,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-10-29","date":"2013-06-19","document_id":"FSB 381-048","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"CERTAIN MACK TRUCKS BUILT BETWEEN JANUARY 1, 2010 AND DECEMBER 31, 2012, MAY EXPERIENCE A POPPING SOUND IN THE SPEAKERS WHEN THE KEY IS IN THE OFF POSITION.","document":null,"url":"https://open.wenmarpro.com/bulletins/10083711","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"CHU","year_from":2011,"year_to":2013,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"CXU","year_from":2011,"year_to":2013,"match":null,"vehicle_ids":[]}],"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":[]}