Dusteck

whats up guys i was driving my car all day today and had no problems what so ever but as i was driving home about a mile from my house the battery light came on. i go a little further and the tranny started acting up the rpm meter stays at zero and the all the lights on the dash lit up. i stoped and turned off my car and started it again and i had to flor it and usually id be going 60 but i was going like 10 but i made it to my house pluged the car into my tourqe app and i pulled up a code that says that the powertrain voltage is low. has andbody eles had this problem if so what do i do the cars dead right now going to go out and get a new battery but am i looking at getting an altinator as well??? i basiclly work from my car for work need help on info asap thanks and btw i did search for about 1 and a half hours befor i wrote this because i know the feeling on having someone not search befor the post a thread.