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If the ignition normally only locks with the vehicle in park position, then check the switch on the gear lever mechanism is working. If not, then you'll have to jiggle and wiggle that key out or replace the ignition lock.
IF ITS IS A LATE MODEL VEHICLE THEY HAVE A SECURITY CHIP IN THE PLASTIC PART OF THE KEY.IF YOU DIDNT HAVE A KEY CUT WITH THE MATCHING CHIP CODE THEN THE VEHICLE WILL NOT START,VSS OR VEHICLE SECURITY SYSTEM GOES INTO "LOCK OUT" AND ENGINE LOSES IGNITION SPARK AND OR FUEL PUMP OPERATION.
This is not unusual on a diesel. What happens is there is air in the system. If this vehicle has an electric fuel pump loosen line where fuel enters injection pump then turn ignition key to the on position and watch for fuel to appear and then quickly tighten line before turning off key. Then try to start. If does not have electric fuel pump will need a second person. One will loosen line and watch while other cranks vehicle until you get fuel and tighten line before the other person releases ignition switch unless vehicle starts first. If that doesn't do the job do this where line hooks onto each injector. Probably will not have to do this to all injectors but could run rough until all the air gets out of everything. I have farmed with diesel tractor for 25 years and dad I drove the gm vehicles with the 5.7. You normally don't start a diesel without bleeding the air out of the lines although some will self bleed most won't. Hope this does the trick.
Close the doors. Lock the doors using the buttons on the key fob. Use the fob to again unlock the doors. The key should then work the ignition. If this will not work, you will have to tow your vehicle to the dealer and buy a new key and/or fob and have it programmed to the vehicle.
You may want to try to slightly push / pull your vehicle to take weight / tension off the transmission, which in turn will allow you to turn the steering wheel enough to see if the ignition switch can be turned.
You have to do a relearn procedure on the anti-theft system:
Attempt to start the vehicle. Leave the ignition on until the THEFT SYSTEM indicator turns off (about 10 minutes). Turn the ignition switch off. Leave the ignition switch off with key in for about 10 minutes. Attempt to start vehicle.
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