{"nhtsa_id":10010052,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-11-04","date":"2004-01-01","document_id":"3131","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"summary":"4WD INOPERATIVE WITH POSSIBLE DIAGNOSTIC TROUBLE CODE'S B0770, B0775, B0780, B0785, OR B2725. 2005 CHEVROLET TRAILBLAZER AND TRAILBLAZER EXT. *SC","document":null,"url":"https://open.wenmarpro.com/bulletins/10010052","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":["B0770","B0775","B0780","B0785","B2725"],"topics":[],"vehicles":[{"make":"GMC","model":"ENVOY","year_from":2005,"year_to":2005,"match":"exact","vehicle_ids":["2005_gmc_envoy"]},{"make":"UNKNOWN","model":"UNKNOWN","year_from":null,"year_to":null,"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":[]}