Hi everyone. After not turning my C63 in two months I turned it on today and it did not wanted to start with the Keyless go button till I took it off and started the car with the key like any other car. I checked the battery voltage when the car is turned off and it is says it is low, it is 11 v. My question is why does the car only start starts by cranking it with the key like a normal car and not with the keyless go button when the car is on low battery like today?.

 

Low voltage can cause a myriad of odd electrical issues and general weirdness, so going to be tough to pinpoint unless someone has encountered this same scenario before.

 

Is the key battery low as well? That happened to me before, Once I changed the 2025 battery it worked fine.

My key also went through the washing machine once. The car would start if cranked but not of the buttons or keyless go worked. Fast forward many months later I tried it for the hell of it, and it everything worked fine.

 

Put your car on a trickle charger. You must have one hell of a battery for it to not die after about 3 weeks. With voltage in the low 11's and asking why things dont work is like getting 2 hours of sleep after working a 48 hour shift and someone asking why you're in a bad mood before having your morning coffee.