{"nhtsa_id":10149666,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-12-03","date":"2015-07-03","document_id":"21-045-15","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"Flash: 8HP70 Transmission Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience one of more of the following conditions. ? Bump sensation during low speed tip-in acceleration. ? Downshift engine flare during coast down deceleration at higher altitudes. ? Bump sensation during 6-5 downshift. ? Bump sensation during 1-2 upshift. ? Intermittent delayed upshifts in 1st or 2nd gear. ? Less than desired shift quality when operating the vehicle in Four Wheel Drive (4WD) Low mode. ? With the vehicle stationary and the Selec-Terrain system set to Snow Mode, the transmission will perform a 2-1 downshift when pressing the (+) steering wheel mounted shift paddle instead of remaining in 2nd gear.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10149666-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10149666-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10149666","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2015,"year_to":2015,"match":"exact","vehicle_ids":["2015_jeep_grand-cherokee"]}],"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":[]}