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This often isn't something you can fix at home. The common problem for this code is a failed Sentry Key Immobilizer Module which needs to be done at dealership and is about a $400 job. You can try a different key and if that doesn't work disconnect battery and touch cables together with battery disconnected for 2 minutes to reset system. Beyond that there isn't much you can do at home because new module needs to be reprogrammed with dealer scantool. Let me know if you have more questions, thanks.