2015 CHEVROLET TAHOE WAS PARKED ON MODERATELY SLOPED DRIVEWAY. ENGINE WAS NOT RUNNING. VEHICLE TRANSMISSION SHIFTER WAS IN "PARK" POSITION. VEHICLE SPONTANEOUSLY ROLLED BACK SEVERAL FEET, AND CRASHED INTO ANOTHER PARKED VEHICLE. OTHER VEHICLE ALSO OWNED BY ME. SUBSTANTIAL DAMAGE TO BOTH VEHICLES. NOT INFLUENCED BY DRIVER. AFTER SOME RESEARCH IT IS MY BELIEF THE APPARENT PROBLEM WITH THE TRANSMISSION/SOFTWARE. I DID FIND WHERE THERE WAS A RECALL #14192 FOR THIS ISSUE.