{"nhtsa_id":600283,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1998-05-05","date":"1998-05-05","document_id":"9802676121B","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"COMMENTS ON ENGINE EXHAUST NOISE WHICH IS NORMALLY LOUDEST DURING COLD ENGINE OPERATION. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/600283","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"MEDIUM DUTY","year_from":1991,"year_to":1993,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"B7","year_from":1993,"year_to":1993,"match":"exact","vehicle_ids":["1993_gmc_b7"]},{"make":"GMC","model":"B7","year_from":1995,"year_to":1995,"match":"exact","vehicle_ids":["1995_gmc_b7"]},{"make":"GMC","model":"C6","year_from":1991,"year_to":1993,"match":"exact","vehicle_ids":["1991_gmc_c6","1992_gmc_c6","1993_gmc_c6"]},{"make":"GMC","model":"C6","year_from":1995,"year_to":1995,"match":"exact","vehicle_ids":["1995_gmc_c6"]},{"make":"GMC","model":"C7","year_from":1991,"year_to":1993,"match":"exact","vehicle_ids":["1991_gmc_c7","1992_gmc_c7","1993_gmc_c7"]},{"make":"GMC","model":"C7","year_from":1995,"year_to":1995,"match":"exact","vehicle_ids":["1995_gmc_c7"]},{"make":"GMC","model":"P SERIES","year_from":1991,"year_to":1995,"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":[]}