{"nhtsa_id":10159908,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-05-20","date":"2015-11-05","document_id":"21-058-15","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE","mfr_system":null,"summary":"Flash: Transmission Diagnostic And Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience the following: ? Whine coming from the transmission during gear change. ? Transmission lamp on the Instrument Panel Cluster (IPC) is illuminated. ? Harsh shifting during low speed driving. The following enhancements are included in this software update: ? Improved torque management during gear shifts. ? Better clutch thermal management to improve shift quality. ? Improved low speed driving behavior.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10159908-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10159908-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10159908","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"software","name":"Software","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"ALFA","model":"ROMEO 4C","year_from":2014,"year_to":2015,"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":[]}