GMC 2012 Canyon Owner's Manual page 338

Use the following procedure to dolly
tow a four-wheel-drive vehicle from
the front:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Drive the front wheels onto
the dolly.
3. Put an automatic transmission in
P (Park) or a manual
transmission in 1 (First).
4. Turn the engine off and firmly set
the parking brake. See
Shifting a full time four wheel
drive vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the automatic
transmission is in P (Park) or the
manual transmission is in any
gear. You or others could be
injured. Make sure the parking
brake is firmly set before the
transfer case is shifted to
N (Neutral).
5. Secure the vehicle to the dolly
following the manufacturer's
instructions.
6. Shift the transfer case to
N (Neutral). See Shifting into
N (Neutral) under
7. Release the parking brake only
after the vehicle being towed is
. firmly attached to the towing
vehicle.
8. Turn the ignition to LOCK/OFF.
After towing, see Shifting Out of
N (Neutral) under
If the vehicle being towed will not be
started or driven for six weeks or
more, remove the battery cable from
the negative terminal (post) of the
battery to prevent the battery from
draining.
.
.