Bruce, a code scanner is indispensible with anything that new. You can try the good suggestions that others have already mentioned here...but after that, it would just be guessing if you don't scan it and see what kind of codes it was throwing.
On these newer vehicles it could be something really stupid too- it might not even be broken- for example: I had a vehicle I bought from a friend....ran fine when he dropped it off. He left...and then the darn thing wouldn't start. I call him to see if he had any ideas. "Try the other key". VOILA! It started right up! Turns out, one of the keys had been cut, but never programmed, so when that key was used, the vehicle would crank and do everything else, except start.
That's the kind of insanity ya get to deal with, with these stupid new contraptions. Me? I will not buy anything newer than 2000. I'm trying to get back to 70's vehicles for daily drivers....these newer cars are just too much of a hassle...and for what? They don't do anything special, but they feel like plastic toys.
