My early 2018 M3 LR RWD is now charging at 32 A on 48 A wall connectors. I tried two wall connectors at a Tesla service center, both with the same result, including a PCS_a019 "Power grid or vehicle issue limiting AC charging."
My car was born on 2/1/2018 and definitely has a 48 A charger, which I have used a few times at hotels on road trips. At home I charged at 16 A for several years, but I dropped that to 15 A one or two years ago. My goal was to extend the PCS life, after I realized it had three 16 A circuits and I was running one at its full rating. I do believe that running less than max rating can extend the life of power electronics, by keeping the heat, and the effects of thermal expansion and contraction, down.
Now I have to decide: Replace the PCS when I take the car in for its 6 year service in February, or eke out more life from my original PCS until a second module fails. I don't need more than 32 A charging, but I don't want a sudden failure to disable AC charging completely or shut the car down for some reason.
GSP