{"nhtsa_id":10017464,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-11-09","date":"2008-01-01","document_id":"05-04-21-003","mfr_campaign":null,"replaces":"050421003C","component":"POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"summary":"SERVICE 4WD LIGHT ILLUMINATED, DIAGNOSTIC TROUBLE CODE (DTC) C0374 SET. *TT UPDATED 10/05/07. *NJ INSPECT WIRING HARNESS TO TRANSFER CASE SPEED SENSORS, REPLACE WIRING HARNESS. UPDATED 7/18/08 *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10017464","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":["C0374"],"topics":[],"vehicles":[{"make":"BUICK","model":"RAINIER","year_from":2004,"year_to":2006,"match":"exact","vehicle_ids":["2004_buick_rainier","2005_buick_rainier","2006_buick_rainier"]},{"make":"CADILLAC","model":"ESCALADE","year_from":2003,"year_to":2006,"match":"exact","vehicle_ids":["2003_cadillac_escalade","2004_cadillac_escalade","2005_cadillac_escalade","2006_cadillac_escalade"]},{"make":"CHEVROLET","model":"AVALANCHE","year_from":2003,"year_to":2005,"match":"exact","vehicle_ids":["2003_chevrolet_avalanche","2004_chevrolet_avalanche","2005_chevrolet_avalanche"]},{"make":"CHEVROLET","model":"AVALANCHE 1500","year_from":2006,"year_to":2007,"match":"base","vehicle_ids":["2006_chevrolet_avalanche","2007_chevrolet_avalanche"]},{"make":"CHEVROLET","model":"AVALANCHE 2500","year_from":2006,"year_to":2007,"match":"base","vehicle_ids":["2006_chevrolet_avalanche","2007_chevrolet_avalanche"]},{"make":"CHEVROLET","model":"SILVERADO","year_from":2003,"year_to":2007,"match":"exact","vehicle_ids":["2003_chevrolet_silverado","2004_chevrolet_silverado","2005_chevrolet_silverado","2006_chevrolet_silverado","2007_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SUBURBAN","year_from":2003,"year_to":2005,"match":"exact","vehicle_ids":["2003_chevrolet_suburban","2004_chevrolet_suburban","2005_chevrolet_suburban"]},{"make":"CHEVROLET","model":"SUBURBAN 1500","year_from":2006,"year_to":2007,"match":"base","vehicle_ids":["2006_chevrolet_suburban","2007_chevrolet_suburban"]},{"make":"CHEVROLET","model":"SUBURBAN 2500","year_from":2006,"year_to":2006,"match":"base","vehicle_ids":["2006_chevrolet_suburban"]},{"make":"CHEVROLET","model":"TAHOE","year_from":2003,"year_to":2007,"match":"exact","vehicle_ids":["2003_chevrolet_tahoe","2004_chevrolet_tahoe","2005_chevrolet_tahoe","2006_chevrolet_tahoe","2007_chevrolet_tahoe"]},{"make":"CHEVROLET","model":"TRAILBLAZER","year_from":2003,"year_to":2006,"match":"exact","vehicle_ids":["2003_chevrolet_trailblazer","2004_chevrolet_trailblazer","2005_chevrolet_trailblazer","2006_chevrolet_trailblazer"]},{"make":"CHEVROLET","model":"TRAILBLAZER 360","year_from":2007,"year_to":2007,"match":"base","vehicle_ids":["2007_chevrolet_trailblazer"]},{"make":"GMC","model":"ENVOY","year_from":2003,"year_to":2006,"match":"exact","vehicle_ids":["2003_gmc_envoy","2004_gmc_envoy","2005_gmc_envoy","2006_gmc_envoy"]},{"make":"GMC","model":"ENVOY 360","year_from":2007,"year_to":2007,"match":"base","vehicle_ids":["2007_gmc_envoy"]},{"make":"GMC","model":"SIERRA","year_from":2003,"year_to":2006,"match":"exact","vehicle_ids":["2003_gmc_sierra","2004_gmc_sierra","2005_gmc_sierra","2006_gmc_sierra"]},{"make":"GMC","model":"SIERRA 1500","year_from":2007,"year_to":2007,"match":"base","vehicle_ids":["2007_gmc_sierra"]},{"make":"GMC","model":"SIERRA 2500","year_from":2007,"year_to":2007,"match":"base","vehicle_ids":["2007_gmc_sierra"]},{"make":"GMC","model":"SIERRA 3500","year_from":2007,"year_to":2007,"match":"base","vehicle_ids":["2007_gmc_sierra"]},{"make":"GMC","model":"SIERRA CLASSIC","year_from":2007,"year_to":2007,"match":"base","vehicle_ids":["2007_gmc_sierra"]},{"make":"GMC","model":"YUKON","year_from":2003,"year_to":2007,"match":"exact","vehicle_ids":["2003_gmc_yukon","2004_gmc_yukon","2005_gmc_yukon","2006_gmc_yukon","2007_gmc_yukon"]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":2003,"year_to":2004,"match":"exact","vehicle_ids":["2003_oldsmobile_bravada","2004_oldsmobile_bravada"]},{"make":"SAAB","model":"9-7X","year_from":2005,"year_to":2007,"match":"exact","vehicle_ids":["2005_saab_9-7x","2006_saab_9-7x","2007_saab_9-7x"]}],"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":[]}