Jeep Grand Cherokee 2015 — technical service bulletin
Bulletin 21-038-14 · NHTSA communication 10139854 · issued Nov 25, 2014
Technical service bulletin
communication type
Electrical System
component
2015
model years
1
vehicle entries
Official 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 of more of the following conditions. 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.
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.