Looks some electrical or computer problem. better get proper diagnose first and then DIY.
it could be govenor sensor, immobilser freaking, ABS or TC sensor gone bad.
my m 56 has Intelligent Brake Assist (IBS), which uses the radar cruise control system to detect an obstacle in front of the car this has stopped working.
do i have to get it repaired by the agency or is there anybody else to do the job