{"nhtsa_id":606575,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-08-27","date":"1999-04-01","document_id":"990850004","mfr_campaign":null,"replaces":null,"component":"SEATS","mfr_system":null,"summary":"SUBJECT REGARDING SEAT NOISE / VIBRATION - CREAK IN FRONT SEAT CUSHION, RATTLE / VIBRATION IN 40% FRONT SEAT, JINGLE IN 20% FOLDING CENTER SEAT. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/606575","components":[{"id":"seats","name":"Seats","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"C1","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"K1","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SIERRA","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SILVERADO","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_chevrolet_silverado"]},{"make":"GMC","model":"C1","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"K1","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_gmc_sierra"]},{"make":"GMC","model":"SILVERADO","year_from":1999,"year_to":1999,"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":[]}