{"nhtsa_id":10148603,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-19","date":"2015-01-24","document_id":"21-003-15","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM; EQUIPMENT; 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 indicate that the transmission shift quality may not meet their expectations under the following conditions. These concerns are separated by vehicle. WK Vehicles ? ECO mode will not retain settings. If ECO mode is turned off, it will turn back on after the ignition is cycled. ? Less than desired upshift quality in normal drive mode under light/medium acceleration. ? Less than desired Power-on downshift quality (i.e. passing). ? Less than desired powertrain performance while driving at higher altitudes, on steep grades, or during high speed driving. ? Less than desired tip in/out acceleration during torque converter clutch operation. ? Less than desired engagement quality in 4x4 high or 4x4 low range. WD Vehicles ? ECO mode will not retain settings. If ECO mode is turned off, it will turn back on after the ignition is cycled. ? Less than desired engagement quality in 4x4 high or 4x4 low range.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10148603-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10148603-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10148603","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"DODGE","model":"DURANGO","year_from":2014,"year_to":2014,"match":"exact","vehicle_ids":["2014_dodge_durango"]},{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2014,"year_to":2014,"match":"exact","vehicle_ids":["2014_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":[]}