{"nhtsa_id":10006121,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-04-19","date":"2003-06-01","document_id":"030421005","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"SERVICE 4WD LIGHT ON, 4WD INOPERATIVE, DIAGNOSTIC TROUBLE CODES C0300 AND/OR C0305 SET. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10006121","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["C0300","C0305"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SUBURBAN","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_chevrolet_suburban"]},{"make":"CHEVROLET","model":"TAHOE","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_chevrolet_tahoe"]},{"make":"CHEVROLET","model":"TRAILBLAZER","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_chevrolet_trailblazer"]},{"make":"GMC","model":"ENVOY","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_gmc_envoy"]},{"make":"GMC","model":"SIERRA","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_gmc_sierra"]},{"make":"GMC","model":"YUKON","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_gmc_yukon"]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_oldsmobile_bravada"]}],"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":[]}