Yes. It's a common item to check that the bolts are tight every 'C' Service.
If your truck is still under warranty, have the dealer fix it. If it's not, it's an easy fix to replace the bolt if it hasn't sheared off in such a way that the threads are destroyed.
It would also help if you provided a tad bit more info on the truck. Year, engine (NA/TD/Gas), etc.
-Steve
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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