2013 Chevrolet Tahoe Owner Manual - Page 297

Driving and Operating 2 m (Two-Wheel Drive High): This setting is used for driving in most street and highway situations. The front axle is not engaged in two-wheel drive. This setting also provides the best fuel economy. AUTO (Automatic Four-Wheel Drive): This setting is ideal for use when road surface traction conditions are variable. When driving the vehicle in AUTO, the front axle is engaged, and the vehicle's power is sent to the front and rear wheels automatically based on driving conditions. Driving in this mode results in slightly lower fuel economy than Two-Wheel Drive High. 4 m (Four-Wheel Drive High): Use the Four-Wheel Drive High position when you need extra traction, such as on snowy or icy roads or in most off-road situations. This setting also engages the front axle to help drive the vehicle. This is the best setting to use when plowing snow. Service Four‐Wheel Drive If the SERVICE 4 WHEEL DRIVE message stays on, you should take the vehicle to your dealer for service. See "SERVICE 4 WHEEL DRIVE" message under Transmission Messages on page 5‑42. Shifting Into Four-Wheel Drive High or AUTO (Automatic Four-Wheel Drive) Turn the knob to the Four-Wheel Drive High or AUTO position. This can be done at any speed. The indicator light will flash while shifting. It will remain on when the shift is completed. Shifting Into Two-Wheel Drive High 9-39 Turn the knob to the Two-Wheel Drive High position. This can be done at any speed. The indicator light will flash while shifting. It will remain on when the shift is completed. 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.