Jeep Grand Cherokee 2015 — technical service bulletin
Bulletin 21-045-15 · NHTSA communication 10149666 · issued Jul 3, 2015
Technical service bulletin
communication type
Power Train
component
2015
model years
1
vehicle entries
Official 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. ? W
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.