On a long road trip — about halfway on [XXX] — received an error message on 48v system malfunction — immediately called nearest Mercedes dealership (Richmond Va) to schedule a service — while on the line received an engine overheating pull over and shut it off message — at this point vehicle deaccelerated over riding my control of vehicle speed. Had to navigate from far left lane to right hand emergency lane at 40 mph — very dangerous maneuver as losing power. Vehicle was towed and received a 48v software update — software that deaccelerates the vehicle with no override for safety is a real problem INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)