{"nhtsa_id":10000456,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2003-02-27","date":"2002-11-01","document_id":"020604026A","mfr_campaign":null,"replaces":"020604026","component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"ENGINE BACKFIRE AND RELATED DRIVEABILITY ISSUES. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10000456","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"B7","year_from":1999,"year_to":2002,"match":"exact","vehicle_ids":["1999_chevrolet_b7","2000_chevrolet_b7","2001_chevrolet_b7","2002_chevrolet_b7"]},{"make":"CHEVROLET","model":"C6500","year_from":1999,"year_to":2002,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"C7500","year_from":1999,"year_to":2002,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"B7","year_from":1999,"year_to":2002,"match":"exact","vehicle_ids":["1999_gmc_b7","2000_gmc_b7","2001_gmc_b7","2002_gmc_b7"]},{"make":"GMC","model":"C6500","year_from":1999,"year_to":2002,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C7500","year_from":1999,"year_to":2002,"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":[]}