{"nhtsa_id":10001144,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2003-04-17","date":"2003-02-01","document_id":"020421002A","mfr_campaign":null,"replaces":"020421002","component":"POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"summary":"SERVICE 4WD INDICATOR ILLUMINATED, DIAGNOSTIC TROUBLE CODE (DTC) B2725 SET, TRANSFER CASE SELECTOR SWITCH IS IN ONE POSITION - INDICATOR LAMP INDICATES ANOTHER RANGE IS SELECTED. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10001144","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":["B2725"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"TRAILBLAZER","year_from":2002,"year_to":2003,"match":"exact","vehicle_ids":["2002_chevrolet_trailblazer","2003_chevrolet_trailblazer"]},{"make":"GMC","model":"ENVOY","year_from":2002,"year_to":2003,"match":"exact","vehicle_ids":["2002_gmc_envoy","2003_gmc_envoy"]}],"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":[]}