I had an issue w/ a car where it wouldnt start unless it was at a fll 14volts (on a jumpbox, being jumped from a running car, etc) and it turned out to be frayed wires at the starter connection. Other suggestions are to try reprogramming the key, wiggling the key in the ignition (do you have a heavy keyring w/ lots of keys?), try using another key. I've had issues where the trans failsafe wasn't allowing the car to crank....is the P highlighted on the dash when you first turn the key on? When I get the TFS code popping up that none of the letters on the dash lit up. Lastly, try neutral. Hopefully one of these work.

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