{"nhtsa_id":10000943,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2003-04-05","date":"2005-03-01","document_id":"030730001","mfr_campaign":null,"replaces":"030730001A","component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"TRANSMISSION SLIPPING OR TORQUE CONVERTER CLUTCH (TCC) INOPERATIVE WITH NO SERVICE ENGINE SOON (SES) LIGHT DISPLAYED AND NO DIAGNOSTIC TROUBLE CODE (DTC) P1870. *TT UPDATE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10000943","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":["P1870"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"TRAILBLAZER","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_chevrolet_trailblazer"]},{"make":"GMC","model":"ENVOY","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_gmc_envoy"]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_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":[]}