I was pulling the car in to a parking lot in a mall. I was driving very slow to bring the car to a halt. All of a sudden the car just accelerated and went and hit a pillar right in front of the parking lot. I don't know what caused the vehicle to suddenly accelerate. I am pretty sure I did not step of the gas pedal. I checked the dashcam for recordings but couldn't find any. We have experienced this sudden unintended acceleration before on the road as well. I think I must have engaged auto-pilot or auto-steer by mistake which caused this.