Why is my Acura RDX making a chattering sound when I make a turn?

Either an axle shaft is making noise, or the rear differential is making noise due to fluid that needs to be replaced. Have you ever serviced this fluid when the "6" indicator has come on? Typically the differential fluid is replaced first around 15,000 miles, and then every 30,000 or so miles thereafter, when the minder "6" indicator comes on.

Is your car front wheel drive or all wheel drive. Only all wheel drive have differential and transfer case Check with your VIN I will suggest you take it back to the shop who did the work. If you need anything else done you may look into mobile mechanic network Check them out here and get an instant quote https://bit.ly/3jPqGmH