I recently had an accident with the car. I was driving in a gated subdivision under very low speed, when I put the shifter in reverse in order to back up the car, the car failed to go into reverse and gave no warning, I assumed that the car was in reserve mode and tried to accelerate , the car lurched forward instead, hit some rocks and stopped. We requested BMW engineering team to inspect the car. they failed to identify any issue with the shifter or explain why the shifter did not go into reverse and gave no warning when it happened