My 2015 Rubicon does this as well. Cruising down the highway and you hit a hill, automatic trans downshifts and around 4000 RPM for more than a couple of seconds causes a chime and the CEL to flash. Once you slow down and let the trany shift the light goes out. My question is will there be a code to read after the light goes out? Also, this happened with stock wheels and tires and it just happened again after installing my 35" tires and re-program with FlashCal if that helps??