No accident has occurred yet as a result of the following deficiency. Headlights on my 2014 GMC Sierra 1500 slt are totally inadequate on high or low beam. The lighting distance is inadequate and is so directional that there is no side flair lighting for turning like you have with conventional headlights. This is a serious safety issue and needs to be addressed immediately by the NHTSA. I have had this vehicle for 1 1/2 years and the problem is ongoing since I bought it. The dealer has no solution.

- Poway, CA, USA

Vehicle has shudder, wobble and vibration when being driven at speeds 40-80. GMC has diagnosed as a tire issue but vehicle has been seen 14+ times and tires have all been road force balanced, numerous times. GMC refuses to diagnose further and has not identified the cause of the problem. Vibration has affected other components. Commonly reported problem affecting 2014 GMC Sierra trucks based on internet search.

- Brandon, FL, USA

The backseat headrests do not remain in the upright position. They slide down with the slightest contact from the person's head. The maintenance/service person at the dealership indicated that there has been numerous complaints from owners. He indicated that at this time it is a "no fix" problem. This is unacceptable and does not meet the national highway traffic boards regulations on headrest equipment. This is a real safety concern. The service department indicated that a latch needs to be installed to hold the headrest in place. If this is not corrected, people will at some point in time sustain serious injury. I feel like contacting 60 minutes with the problem and your response.

- St George , UT, USA

Truck vibrated new with 8 miles when we first drove it home. Pinpointed specific speeds and returned 9+ times to dealership over 7 months. Tires (twice), shocks and rear end were all replaced but did not stop vibration. 5 months from purchase we were followed by a neighbor and they saw my truck "dog tracking" (traveling sideways down the road). Dealer noted but would not follow at distance and speed required to witness the "dog tracking". dealer told me they were clueless and come get the truck. Local auto repair shop followed me and said there is definitely a problem. Front center of wheel to back center of wheel measures 1/2 inch less on driver side than passenger side but dealer says that is not a good measurement because their computer says everything is fine. This truck vibrates and "dog tracks" and dealership refuses to make proper offer and has given up on repair attempts. I am presently seeking help from a different dealer.

- Kirby, AR, USA