GMC Envoy Owner's Manual page 367

Then, without shutting off the engine, follow these steps:
See Engine Compartment Overview on page 5-12 for
more information on location.
1. Flip the handle up and then pull out the dipstick
and wipe it with a clean rag or paper towel.
2. Push it back in all the way, wait three seconds and
then pull it back out again. Check both sides of the
dipstick, and read the lower level.
5-24
The automatic transmission
dipstick handle with the
transmission and lock
symbol is located in the
engine compartment on
the passenger's side
of the vehicle.
3. If the fluid level is in the acceptable range, push the
dipstick back in all the way; then flip the handle
down to lock the dipstick in place.