Investigating a potential class action lawsuit against GMC for a manufacturing defect in its 2014 GMC Sierra light-duty truck (1500 only) or 2015 GMC Sierra truck (1500, 2500 or 3500).  It is alleged that the headlights in these vehicles are too dim for safe night driving.  Some GMC vehicle owners have taken their vehicles to GMC service garages to fix the problem only to learn that GMC has no fix for it.  They also report that driving in treacherous weather (snow or rain) and in different terrains (mountains) is dangerous.  If you own or lease a 2014 GMC Sierra light-duty truck (1500 only) or 2015 GMC Sierra truck (1500, 2500 or 3500), please submit your information below.