{"nhtsa_id":10005146,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-02-09","date":"2004-05-01","document_id":"010604052A","mfr_campaign":null,"replaces":"010604052B","component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"ON-BOARD DIAGNOSTIC (OBD) SYSTEM IMPROVEMENTS - SERVICE ENGINE SOON LIGHT ON, DIAGNOSTIC TROUBLE CODE (DTC) P0014, P0116, OR P1683 SET, DELAYED TRANSMISSION DOWNSHIFT AND/OR EXCESSIVE FAN NOISE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10005146","components":[{"id":"engine","name":"Engine","parent":null}],"codes":["P0014","P0116","P1683"],"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"]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":2002,"year_to":2002,"match":"exact","vehicle_ids":["2002_oldsmobile_bravada"]}],"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":[]}