Jeep Grand Cherokee 2014 — technical service bulletin
Bulletin 21-026-14 · NHTSA communication 10139707 · issued Aug 27, 2014
Technical service bulletin
communication type
Electrical System
component
2014
model years
1
vehicle entries
Official summary
Flash: Transmission Shift Enhancements This bulletin involves flash reprogramming of the Transmission Control Module (TCM) with new software. Some customers may experience any or all of the following transmission shift concerns. 3-2, 2-1 Shift bump on deceleration. Shift quality during hard acceleration. Excessive shifts during cruise control operation. Intermittent delay shift condition. Engine braking improvements during downhill descent. Manual gear selection improvements at higher altitudes. Drivability improvements in 4 low. Hesitation improvements. Inconsistent and/or harsh 1-2, 2-3, 3-4
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.