One problem related to transmission not engage has been reported for the 2015 Hyundai Santa Fe. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Hyundai Santa Fe based on all problems reported for the 2015 Santa Fe.
Transmission disengages at red-line speeds. Engine rpm's continue to rev up while vehicle forward trajectory is cut off. Intermittent problem - creates safety issue when passing at freeway speeds and transmission disengages at red-line instead of shifting up to the next gear. When going from zero to sixty (from a stop) the tachometer/transmission will disengage after first gear hits redline. This happens while in automatic mode. Engine continues to rev higher rpm's, but vehicle loses forward trajectory. This has been an intermittent problem since owning the car which was purchased brand new in 2015.