Charliesimple

U0100 so I’ve replaced the starter. I replaced the relays. I replaced the ignition switch and then I replace the immobilizer but before I did all that the car wouldn’t have a hard time starting or turning over or anything unless I put it in neutral and then after a couple of weeks, it wouldn’t work in neutral and so I replaced the the battery and I also got it reprogrammed but there’s a code saying U0 100–28 and now there’s no start no crank