If you have time on a weekend, it's likely still worth the effort to pull all of the grounds and power leads to clean up the connectors and studs. Use some dielectric grease or Fluid Film to keep the gremlins away in the future.
Did you ever figure out what you need? I just bought a 2019 Tahoe PPV myself and it included factory start. I can give you the info from mine if needed.
Another oddity, I am also in N.H.
J
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