2021 GLC... Simple, remote start does not work, bring it to the dealer and it worked, Monday thru Friday it doesn't work and I get error messages... this along with the MBUX system issues, it just plain sucks!!! What a waste of my time and it's just aggravating, I have deleted the app... Back to old school, just drive it till a light comes on then they can check something otherwise the MB Techs suck!