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I actually had the same (not exactly sure) error trying to do mine and made a post here, but figured it out lol. The DSC programming never took because my IGN wasn't "ON". Make sure your ign is ON while you read or write that module, it should read and write without any COAPI error. May sound stupid but coding the DSC module last according to the instructions, there had elapsed enough time for the car to turn off power.
Hopefully you figure it out!
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IG @cchen9_
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