{"nhtsa_id":10017442,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-11-08","date":"2004-12-01","document_id":"040421004","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"summary":"4WD SWITCH INDICATOR LIGHTS FLASHING, 4WD INOPERATIVE, DIAGNOSTIC TROUBLE CODES C0327, P0550 SET. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10017442","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":["C0327","P0550"],"topics":[],"vehicles":[{"make":"BUICK","model":"RAINIER","year_from":2004,"year_to":2005,"match":"exact","vehicle_ids":["2004_buick_rainier","2005_buick_rainier"]},{"make":"CHEVROLET","model":"TRAILBLAZER","year_from":2002,"year_to":2005,"match":"exact","vehicle_ids":["2002_chevrolet_trailblazer","2003_chevrolet_trailblazer","2004_chevrolet_trailblazer","2005_chevrolet_trailblazer"]},{"make":"GMC","model":"ENVOY","year_from":2002,"year_to":2005,"match":"exact","vehicle_ids":["2002_gmc_envoy","2003_gmc_envoy","2004_gmc_envoy","2005_gmc_envoy"]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":2002,"year_to":2004,"match":"exact","vehicle_ids":["2002_oldsmobile_bravada","2003_oldsmobile_bravada","2004_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":[]}