2014 Chevrolet Silverado 1500 Extended Cab Owner Manual - Page 291

Driving and Operating M (Manual Mode): This position allows selection of a range of gears appropriate for current driving conditions. If equipped, see "Range Selection Mode" under Manual Mode on page 9-38. 9-37 Normal Mode Grade Braking If equipped with a gasoline engine and an automatic transmission, Normal Mode Grade Braking is enabled when the vehicle is started, but is not enabled in Range Selection Mode. It assists in maintaining desired vehicle speeds when driving on downhill grades by using the engine and transmission to slow the vehicle. The first time the system engages for each ignition key cycle, a DIC message will be displayed. See Transmission Messages on page 5-41. { Caution Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transmission. The repair will not be covered by the vehicle warranty. If you are stuck, do not spin the tires. When stopping on a hill, use the brakes to hold the vehicle in place. To disable or enable Normal Mode Grade Braking within the current ignition key cycle, press and hold the Tow/Haul button for five seconds. When the button is released, the requested mode change is made. A DIC message displays. See Transmission Messages on page 5-41. For other forms of grade braking, see Tow/Haul Mode on page 9-39 and Cruise Control on page 9-61.