I called my nearest MB Dealer (which is 60 mi away) and he suggested a switch that is in the console where the gear selector moves to the right to go into low. Said they were bad about sticking. I have looked and do not see anything except the plastic cover that slide over as you move the gear selector. Is this a possiblity and if so how do I see the switch. Thanks for all your help. I will try the additional items and report back.