Jeep Grand Cherokee 2014 — technical service bulletin
Bulletin 21-036-14 · NHTSA communication 10139723 · issued Nov 8, 2014
Technical service bulletin
communication type
Electrical System
component
2014
model years
1
vehicle entries
Official summary
Flash: Drivetrain Control Module (DTCM), Driveline Bump Sensation During Low Speed Transmission Downshifts This bulletin involves selectively erasing and reprogramming the Drivetrain Control Module (DTCM). A small number of customers may experience a driveline bump sensation during low speed transmission downshifts. This condition typically occurs in speeds less than 15 mph (24 kph) during a 2-1 downshift.
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.