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Hello, my name is***** am an ASE master tech, and I can help you with this.
You might have a bad switch for the truck ajar. This sends the open and close signal to the bcm and then this message will be displayed. The switch for the trunk is built into the latch. You would need to check the voltage at the latch and see if the switch is open or closed. Also check for loose connections, and broken wirings.
Let me know if you have any more questions.
Dan again, hoping you are satisfied with my service.Could you please rate the answer, it would be greatly appreciated. Thanks!