2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 186

7. If the engine is running, verify that the transfer case is in N (Neutral) by shifting the transmission to R (Reverse) for one second, then shift the transmission to D (Drive) for one second. 8. Turn the ignition to ACC/ACCESSORY, which will turn the engine off. 9. Place the transmission shift lever in P (Park). 10. Release the parking brake prior to moving the vehicle. 11. Turn the ignition to LOCK/OFF. 3. Turn the transfer case dial to Two-Wheel-Drive High. After the transfer case has shifted out of N (Neutral), the N (Neutral) light will go out. 4. Release the parking brake prior to moving the vehicle. Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear. 5. Start the engine and shift the transmission to the desired position. Excessively shifting the transfer case into or out of the different modes may cause the transfer case to enter the shift protection mode. This will protect the transfer case from possible damage and will only allow the transfer case to respond to one shift per 10 seconds. The transfer case may stay in this mode for up to three minutes. Shifting Out of Neutral To shift the transfer case out of N (Neutral) do the following: 1. Set the parking brake and apply the regular brake pedal. 2. Turn the ignition to ON/RUN with the engine off, and shift the transmission to N (Neutral). 3-48