GMC Envoy Owner's Manual page 354

2. Then go to the front of the vehicle and release the
secondary hood release.
3. Lift the hood, release the prop rod from its retainer
and put the prop rod into the slot in the hood.
Before closing the hood, be sure all the filler caps are
on properly. Then lift the hood to relieve pressure on the
prop rod. Remove the prop rod from its slot in the
hood and return the prop to its retainer. Lower the hood
6 to 8 inches (15 to 20 cm) above the vehicle and
release it to latch fully. Check to make sure the hood is
closed and repeat the process if necessary.
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