Hello, I'm Danny.
When you change out the ECM you need to "flash" or program the VIN- vehicle identification number from your truck so all the information from your trucks ECM can be transferred to the new one you purchased so they can be compatible. I've attached picture steps below on how to remove and replace the ECM on your truck. Hope this helps and thanks for using 2CarPros.
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Wednesday, August 25th, 2021 AT 10:37 PM