The transmission drive selector module may fail resulting in the loss of gear selection capability. In most cases this condition will leave the vehicle stranded and require replacement of the drive selector module.Google+
Car Problem Reports
Mercedes-Benz GL320 CDI The Transmission Drive Selector Module May Fail
Mercedes-Benz GL320 CDI Problem
Average Mileage: 105,000 mi (75,000 mi - 135,000 mi)
Visitor, 2007 Mercedes-Benz GL320 CDI, 75,000 mi
The car won't shift into drive when the car is cold. I have to turn the car off and back on then it goes into drive.