I have a Mercedes Benz 2015 C300. I get a message “Stop car, put in P, Leave Engine Running”
A battery symbol appears above the message. I had the battery tested by two places and both said the batter was fine. I heard that my model also has an alternate battery. It seems to happen when the weather is cold (35 degrees or below). The message stays on the display but if I turn off the engine and restart the car it disappears, although it may appear again.