Truck just wont start. Ive never had a problem with my truck until last Thursday when I was going to leave my buddies house and all the truck does is crank. All the fuses are good, so its not a fuel heater problem and I dont think its the cps because the tach works when it cranks. I used 2 different computer scanners and one said no codes and the other said error. The only thing I did do to the truck is put a tw chip on it 2 days before and it has never been a problem and its the first thing I removed to try to start it up. I dont think the pcm is fried because the wait to start light comes on still but is there any other way to test. Any help is appreciated because I have had no truck since Thursday night and now my truck is on my trailer it the backyard. I was wondering if it could be a the park safety switch but Im unsure were its at and how to check if its bad.