214 DRIVING AND OPERATINGSee Tow/Haul Mode Light 0 145 andHill and Mountain Roads 0 195.Also see “Tow/Haul Mode” underDriver Mode Control 0 223.Tow/Haul Mode Grade BrakingTow/Haul Mode Grade Braking is onlyenabled while the Tow/Haul Mode isselected and the vehicle is not in theRange Selection Mode. See “Tow/HaulMode” listed previously and ManualMode 0 212. Tow/Haul Mode GradeBraking assists in maintaining desiredvehicle speeds when driving ondownhill grades by using the engineand transmission to slow the vehicle.To disable or enable Tow/Haul GradeBraking within the current ignitioncycle, press and hold the Tow/Haulbutton for five seconds. When thebutton is released, the requested modechange is made. A DIC message isdisplayed.See Towing Equipment 0 259.For other forms of grade braking, seeAutomatic Transmission 0 209 andCruise Control 0 226.Drive SystemsFour-Wheel DriveFour-wheel drive engages the frontaxle for extra traction.CautionDo not drive on clean, drypavement in 4 m and 4 n (ifequipped) for an extended period oftime. These conditions may causepremature wear on the vehicle'spowertrain.Driving on clean, dry tarmac in 4 m or4 n may:. Cause a vibration to be felt in thesteering system.. Cause tyres to wear faster.. Make the transfer case harder toshift, and cause it to run noisier.{ WarningWith four-wheel drive, the vehiclewill be free to roll if the transfercase is in N (Neutral), even whenthe gear lever is in P (Park). Be surethe transfer case is in a drive gear— 2 m, 4 m, or 4 n — not inN (Neutral). See Shifting Into Park0 205.CautionExtended high-speed operation in 4n may damage or shorten the life ofthe drivetrain.Engagement noise and bump whenshifting between 4 n and 4 m or fromN (Neutral), with the engine running,is normal.Shifting into 4 n will turn TractionControl and StabiliTrak off. SeeTraction Control/Electronic StabilityControl 0 221.
