This just happened to me with my new 2014 Journey. "No key detected". I actually parked, turned off the engine, came out and no response with pressing the door lock. I first though that my passenger may not have locked his door properly but it was. So I got back in the car to restart it and that's when I got the "no key detected". I called my sister to bring my second key and got the same response. So I called the dealer (car is only a month old) and they had no answer since both keys were tried. I called Chrysler Roadside assistance and arranged a tow. Unfortunately I was parked on the 5th floor so it limited the size of tow truck available. After 3 hours an appropriate sized tow arrived, lifted it up from the rear (I was parked forward), pulled it out a few feet, went inside to lock the steering wheel and it just started. Yet I had tried several times over the 3 hr wait and the tow truck driver also tried on first arrival.
I drove it to the dealer and nothing found, specifically no codes found. A mystery!