2010 GMC Canyon Extended Cab Owner's Manual - Page 259

3. Turn the engine off and firmly set the parking brake. See Parking Brake on page 3-30. 4. Securely attach the vehicle being towed to the tow vehicle. 5. Shift the transfer case to N (Neutral). See "Shifting into N (Neutral)" under Four-Wheel Drive on page 3-25. 6. Turn the ignition to LOCK/OFF and remove the key - the front wheels will still turn. 7. Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle. After towing see "Shifting Out of N (Neutral)" under Four-Wheel Drive on page 3-25. 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. { WARNING: 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). 5-43