The contact owns a 2011 GMC Terrain. The contact stated that while idled, there was smoke coming from under the hood of the vehicle. The contact turned off the vehicle and the smoke dissipated. The contact took the vehicle to a certified mechanic who stated that the the timing chain had come to the head without much heat. The timing chain needed to be repaired. The vehicle had not been repaired as of yet. The contact had not contacted the manufacturer. The approximate failure mileage was 200,000.