What is wrong with my vehicle?

Hello, This sounds like a traction control issue where the vehicle has determined that one or more wheels is slipping. Just like if the tires were slipping, the traction control system will prevent acceleration until traction is regained. Have the vehicle scanned to determine what is causing this condition, and diagnostics can begin from there. Being the vehicle is a 2015 model, you may still have a factory warranty to use at the Jeep dealer, even if you did not buy it new.