Jeep Grand Cherokee 2015 — technical service bulletin
Bulletin 21-040-14 · NHTSA communication 10218232 · issued Nov 26, 2014
Technical service bulletin
communication type
Wheels
component
2015
model years
1
vehicle entries
Official summary
Flash: 8HP70 Transmission Shift Enhancements This bulletin involves reprogramming of the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience one of more of the following conditions. 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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.