Can brake light switch keep transmission from shifting

Hello, the brake light switch can only prevent movement of the shift lever out of the locked park position. The shift lever interlock looks for the signal from the brake light switch to indicate your foot is on the brake and it's ok to place the transmission shift lever into gear. Other than that, you have some kind of internal or possibly electrical transmission issue that requires testing to resolve. Hello, this forum can't really help with specific instructions on how to remove and install components. You'll need to reference a workshop manual with repair instructions to get details, but I'm even going to guess here that specifics aren't even published on this. Seek the guidance of a local Mercedes-Benz technician near you for further details. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops