What is the minimum battery voltage necessary for Start/Stop to work? I measure mine with the engine off and it's 12.42v. Bought the car a few days ago and even after driving around with the longest trip about 45 miles, it still doesn't work. At first I figured its been sitting at the dealership and the battery was run down but now I'm beginning to wonder. 2018 Lincoln MKC Reserve with 10,700 miles on the odometer.