{"nhtsa_id":629356,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-04-02","date":"2002-02-01","document_id":"020421002","mfr_campaign":null,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"summary":"SOME OWNERS MAY COMMENT ON THE SERVICE 4WD INDICATOR ILLUMINATING, IN ADDITION TO DIAGNOSTIC TROUBLE CODE B2725. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/629356","components":[],"codes":["B2725"],"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":[]}