I had the same issue on my 15 Denali. Dealer replaced the strut (under warranty/no charge) and the sound went away. Now I had the 'thunk' sound when driving at slower speeds as I hit bumps, but, going slow over speed bumps made a loud creaky noise.
I have the same issue at 40k miles. Diagnosed at the dealer yesterday, going back in on Friday once the parts come in. Lucky for me, I'm still under warranty. My service manager said it is a known service bulletin caused by a stuck thermostat. Requires thermostat and radiator replacement.
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