{"nhtsa_id":617645,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-03-21","date":"2000-10-18","document_id":"181000","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)","mfr_system":null,"summary":"ENGINEERING IS INVESTIGATING HARSH ONE-TWO SHIFT ON THE 4L60E AUTOMATIC TRANSMISSION. THIS INVESTIGATION IS FOCUSED ON HARSH ONE-TWO SHIFTS ON 2000 MODEL YEAR SILVERADO AND SIERRA EQUIPPED WITH 4L60E AUTOMATIC TRANSMISSION. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/617645","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"},{"id":"transmission-control-module","name":"Transmission control module","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SIERRA","year_from":2000,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SILVERADO","year_from":2000,"year_to":2000,"match":"exact","vehicle_ids":["2000_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":2000,"year_to":2000,"match":"exact","vehicle_ids":["2000_gmc_sierra"]},{"make":"GMC","model":"SILVERADO","year_from":2000,"year_to":2000,"match":null,"vehicle_ids":[]}],"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":[]}