What causes transmission not to shift out of park

Hey, my name is Dusty, and I'm one of the auto experts on RepairPal's Car Genius team. I'm here to help! If your Mercedes-Benz is experiencing difficulty shifting out of park, it may be caused by a malfunctioning brake light switch or a faulty shift interlock solenoid. To diagnose the issue, start by checking the functionality of the brake lights and listening for clicking sounds when you press the brake pedal. If the brake lights are not working, then the brake light switch has failed and needs replacement. If you've confirmed that the brake lights are functioning properly and you don't hear any clicking sounds when the brake pedal is depressed, there may be an issue with the shifter interlock. At that point, it's advisable to seek assistance from a professional technician. They can conduct a thorough inspection and accurately diagnose the problem. You can also reach out to us for further assistance or to locate a certified repair shop in your area. 877-913-1554