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you cannot start your vehicle with a failed PATS key
your key houses a micro chip that communicates with the vehicles computer telling it that you are the rightful owner
the battery that powers the chip has died and the chip no longer communicates time for a dealership visit
you may be right, try a spare key, that will elimanate the key chip, you will need a scan tool to diagnose this problem, also with key in crank position is there power at starter, the scan tool can tell yuo if computer is reading key chip signal and if signal if right and also you can see if starter is receiving start signal, good luck.
I had same problem when I had a plain copy of the key made.
There's a proximity chip in the factory key or something, but the plain copy would not work. Engine would crank, then immediately stop. I didn't need the extra key bad enough to spend $80+ at the dealership.