when the electronic throttle control light comes on what that mean

Hello, Late-model jeeps have this happen quite a bit, and the cause can be several things. Your vehicle is currently in limp mode, because there has been an error detected, however, there may not be any trouble codes stored in the PCM. Have the truck scanned for trouble codes, and post them here. The absence of trouble codes is a good indicator of throttle motor issues, so let me know if there are no codes stored as well.