{"nhtsa_id":10144855,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-09-24","date":"2015-03-25","document_id":"21-018-15","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM; POWER TRAIN","mfr_system":null,"summary":"Flash: 8HP70 SRT 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 or more of the following conditions. ? Less than desired gear shifts when driving on steep grades in lower altitudes. ? Less than desired gear shifts during aggressive, high speed driving. ? Erratic 1-2 upshift in cold ambient temperatures. ? Delayed engagement shifting from reverse to drive. ? Harsh or inconsistent upshift that happens intermittently. ? Harsh or inconsistent downshift that happens intermittently while coasting or during passing maneuvers. ? Intermittent delayed shift from 6th gear during aggressive high speed driving.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10144855-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10144855-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10144855","components":[{"id":"electrical","name":"Electrical system","parent":null},{"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":[]}