Unwanted transmission downshifts on Hyundai Genesis Coupe 3.8

When the shift lever is in D3 and sport mode is selected the transmission may downshift unexpectedly when the throttle is depressed. Our technicians tell us there is a transmission control module (TCM) software update available to correct this concern.

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Average mileage: 60,000 (60,000–60,000)
1 model year affected: 2010
3 people reported this problem
2 people shared problem details
Unexpected downshifting leading to gears being unusable to no transmission at all.
the car will abruptly downshifts.