GMC 2012 Canyon Owner's Manual page 260

Check the fluid level only when
the engine is off, the vehicle is
parked on a level place and the
transmission is cool enough to
touch the transmission case.
After this is done:
1. Remove the fill plug.
2. Check that the lubricant level is
up to the bottom of the fill
plug hole.
3. If the fluid level is good, install
the plug and be sure it is fully
seated. If the fluid level is low,
add more fluid as described in
the next steps.
Here is how to add fluid. Refer to
the Maintenance Schedule to
determine what kind of fluid to use.
See
1. Remove the fill plug.
2. Add fluid at the fill plug hole.
Add only enough fluid to bring
the fluid level up to the bottom of
the fill plug hole.
3. Install the fill plug. Be sure the
plug is fully seated.
The hydraulic clutch linkage in the
vehicle is self-adjusting. The clutch
master cylinder reservoir is filled
with hydraulic clutch fluid.
.
The hydraulic clutch fluid reservoir
cap has this symbol on it. See
It is not necessary to regularly
check clutch fluid unless a leak in
the system is suspected. Adding
fluid will not correct a leak.
A fluid loss in this system could
indicate a problem. Have the
system inspected and repaired.
for reservoir location.