When the truck dies, does it run rough before it dies, or does the engine shut off as if the key was turned off?
you may try to relearn the pass-key system by the following procedure:
30 Minute Re-Learn Procedure
Important: The vehicle learns the PasslockTM Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Let me know if this helps.You may need a new pass lock sensor if this procedure does not work