{"nhtsa_id":10079367,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-09-07","date":"2015-01-14","document_id":"G-208455","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"14584 - SERVICE UPDATE. REPROGRAM THE BODY CONTROL MODULE (BCM) WITH AN UPDATED TOP SPEED CALIBRATION ON CERTAIN 2015 MODEL YEAR CHEVROLET SILVERADO HD CREW CAB AND GMC SIERRA HD CREW CAB VEHICLES EQUIPPED WITH LIQUEFIED PROPANE GAS (LPG) / COMPRESSED NATURAL GAS (CNG) ENGINE (RPO LC8), 6-SPEED AUTOMATIC TRANSMISSION (RPO MYD) AND 4.10 GEAR RATIO REAR AXLE (RPO GT5). IF THIS CONDITION IS NOT CORRECTED, HIGH STRAINS MAY OCCUR IN SOME POWERTRAIN STRUCTURAL AREAS AND PROLONGED EXPOSURE COULD RESULT IN CASE FRACTURES OF THE TRANSMISSION AND/OR TRANSFER CASE, AND FLUID LOSS COULD FOLLOW.","document":null,"url":"https://open.wenmarpro.com/bulletins/10079367","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2015,"year_to":2015,"match":"base","vehicle_ids":["2015_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2015,"year_to":2015,"match":"base","vehicle_ids":["2015_gmc_sierra"]}],"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":[]}