{"nhtsa_id":628547,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-03-13","date":"2001-10-31","document_id":"01065","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"summary":"ON SOME VEHICLES, THE CALIBRATION OF THE ACTIVE TRANSFER CASE CONTROL MODULE MAY CAUSE INSUFFICIENT HIGH SPEED ENGAGEMENT. *TT.","document":null,"url":"https://open.wenmarpro.com/bulletins/628547","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"TRAILBLAZER","year_from":2002,"year_to":2002,"match":"exact","vehicle_ids":["2002_chevrolet_trailblazer"]},{"make":"GMC","model":"ENVOY","year_from":2002,"year_to":2002,"match":"exact","vehicle_ids":["2002_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":[]}