2019 yukon xl No Start

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T_Brad

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2019 yukon xl 5.3. Problem started with the occasional no start when starter button was pressed. Then it would work on the second try. Over the next two weeks it would happen more often, until we got to a point where it would not start at all. (Vid 1)
- battery tested all good.
- replaced starter. This did nothing.
- starter relay appears to be fine (See vid 2)
- starter fuse is good
- ecu module is tight and seated well. (I have not pulled it to look for corrosion or wire problems beneath it

When i try to start I get a single click. (See vid 3) Single click when trying remote start, and single click when trying to jump at starter relay (See vid 4)

Can someone help me on what my next test should be, or point me in the right direction with a similar problem they solved? Thank you in advance.
 

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