One problem related to transmission fluid leaking has been reported for the 2015 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Sierra 1500 based on all problems reported for the 2015 Sierra 1500.
Vehicle has roughly 52,000 miles on it. Noticed leak on passenger side, front. Opened hood, noticed fluid dripping down radiator. Took to garage, dealer identified radiator and ac system had leaks. Not covered under warranty.