{"nhtsa_id":616387,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-02-23","date":"2000-10-17","document_id":"00141","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)","mfr_system":null,"summary":"SOME VEHICLES MAY EXHIBIT A CONDITION WHERE THE TRANSMISSION CONTROL MODULE (TCM) MAY EXHIBIT A LOGIC ERROR. THIS TCM LOGIC ERROR CAN, UNDER CERTAIN OPERATING CONDITIONS, PREVENT TRANSMISSION TORQUE CONVERTER LOCKUP AND LESSEN THE EXHAUST BRAKE EFFECTIVENESS, HOWEVER, THE EXHAUST BRAKE EFFECTIVENESS IS STILL WITHIN THE REQUIREMENTS OF FMVSS 102 FOR TRANSMISSION BRAKING. IF THE VEHICLE IS DRIVEN AT SUSTAINED HIGHWAY SPEEDS FOR PROLONGED PERIODS OF TIME WITHOUT THE TORQUE CONVERTER IN THE LOCK UP MODE, THE TRANSMISSION FLUID SUMP TEMPERATURES MAY RISE RESULTING IN DAMAGE TO THE FRONT PUMP SEAL. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/616387","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":"W3500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"W4500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"W5500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"W3500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"W4500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"W5500","year_from":1999,"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":[]}