Some cases of wind noise at about 45 mph and up have been traced to the parking and turn lamp bezel.
This may be corrected by removing the bezel and applying grey strip caulk, 3M No. 8568, or silicone sealer, 3M NO. 8661, or equivalent, around the perimeter of the bezel.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.