DavidZhu

so on my 2019 gtc coupe I hear this rattling/ticking sound from the back of the car when im off the throttle and the cars around 2k rpm. once I tap the gas the sound goes away. its not a very loud sound, my friend in the passenger cant hear it and you can only hear if you have the radio turned off. any one else experience this in their car? Car was bought brand new and im wondering if this is common or should I have the dealer check it out.

rt7085

Might be exhaust related or something like that. When you get on the gas you create high pressure and hold something that might be loose in place and once you let of it is allowed to be more loose and rattle. I had such an issue on my M5 back in the day, it was the return spring on one of the exhaust flap pneumatic actuator, Just had to tighten it a bit more. Manufacturing tolerance I guess. Bring it to MB. They will take the bottom panels off and can listen better while standing under the car with somebody revving it.