I been having an issue with my 2013 528i, my engine went bad so i dropped a Used engine, everytime i drive it for more than 20 min or go on the highway the car send out this message ***8220;DRIVETRAIN MALFUCTION***8221; and the car loses power, also if i turn it off it wont turn back on, i have to let it cool off for about 30 min. No check engine light comes on. I been with out a car for 3 months now and i am in need of some help please. I change spark plugs, and high pressure fuel pump since the mechanics computer was giving him a default message. PLEASE HELP!!!