GMC Canyon Owner's Manual page 295

3. Put an automatic transmission in PARK (P)
or a manual transmission in FIRST (1).
4. Securely attach the vehicle being towed to the
tow vehicle.
CAUTION:
{
Shifting a four-wheel-drive vehicle's
transfer case into NEUTRAL can cause
your vehicle to roll even if the
transmission is in PARK (P) for an
automatic transmission, or if your
vehicle is in gear, for a manual
transmission. You or others could be
injured. Make sure the parking brake is
firmly set before you shift the transfer
case to NEUTRAL.
5. Shift the transfer case to NEUTRAL.
See Four-Wheel Drive on page 126 for
more information.
6. Release the parking brake only after the
vehicle being towed is firmly attached to
the tow vehicle.
7. Turn the ignition to LOCK.
If the tow vehicle 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 your battery from draining
while towing.
After towing see "Shifting Out of NEUTRAL" under
Four-Wheel Drive on page 126.
295