GMC 2012 Canyon Owner's Manual page 276

It is not necessary to regularly
check rear axle fluid unless there is
a leak suspected or an unusual
noise is heard. A fluid loss could
indicate a problem. Have it
inspected and repaired.
To get an accurate reading, the
vehicle should be on a level
surface.
The proper level is from 0 mm to
10 mm (0 to 3/8 in) below the bottom
of the fill plug hole, located on the
rear axle.
See
determine which kind of lubricant
to use.
When you are doing this
inspection, the vehicle could
move suddenly. If the vehicle
moves, you or others could be
injured.
1. Before starting this check, be
sure there is enough room
around the vehicle.
2. Firmly apply both the parking
brake and the regular brake.
See
Do not use the accelerator
pedal, and be ready to turn off
the engine immediately if it
to
starts.
3. Try to start the engine in each
gear. The vehicle should start
only in P (Park) or N (Neutral).
If the vehicle starts in any other
position, contact your dealer for
service.
.