IS their a certain part on ignition switch that could be faulty ????? Rather then looking to replace parts that may not fix the problem ,take an have a scan tool hooked up an have code's in the BCM - body control module .Qualified repair shop. The BCM controls the anti-theft . Not to auto zone or pep boy's or advance etc. They can not read BCM code's .
Passlock?"¢ System
The Passlock?"¢ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock?"¢ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock?"¢ System are as follows:
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The ignition lock cylinder and key

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The ignition lock cylinder case, including the Passlock?"¢ sensor

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The ignition switch

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The body control module (BCM)

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The security indicator on the instrument cluster

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The powertrain control module (PCM)

Do you know what DTC'S - diagnostic trouble code's are
DTC B2947 DTC B2948 DTC B2957 DTC B2958 DTC B2960 DTC B3031 DTC B3033 DTC P1626 DTC P1630 DTC P1631 DTC P1632