GMC 2009 Envoy Denali Owner's Manual page 325

Then, without shutting off the engine, follow these steps:
1. Flip the handle up and then remove the dipstick
and wipe it with a clean rag or paper towel.
See Engine Compartment Overview on page 5-12
for more information on location.
2. Reinstall it back in all the way, wait three seconds
and then pull it back out again. If the dipstick does
not go down the tube easily, turn the blade and
try again until it is fully inserted in the tube.
The automatic
transmission dipstick
handle with this symbol on
it is located in the engine
compartment on the
passenger side of the
vehicle.
3. Check both sides of the dipstick and read the lower
level. The fluid level must be in the COLD area,
below the cross-hatched area, for a cold check or
in the HOT or cross-hatched area for a hot check.
Be sure to keep the dipstick pointed down to get an
accurate reading.
4. If the fluid level is in the acceptable range, reinstall
the dipstick back in all the way; then flip the handle
down to lock the dipstick in place.
5-23