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. Slow down when approaching
the top of the hill.
. Use headlamps even during the
day to make the vehicle more visible.
Warning (Continued)
Warning (Continued)
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Driving and Operating
{ Warning
Driving to the top of a hill at high speed can cause an accident. There could be a drop-off, embankment, cliff, or even another vehicle. You could be seriously injured or killed. As you near the top of a hill, slow down and stay alert.
. Never go downhill forward or
backward with either the transmission or transfer case in N (Neutral). The brakes could overheat and you could lose control.
transfer case overrides the transmission. You or someone else could be injured. If leaving the vehicle, set the parking brake and shift the transmission to P (Park). Shift the transfer case to any position but N (Neutral).
. When driving down a hill, keep
the vehicle headed straight down. Use a low gear because the engine will work with the brakes to slow the vehicle and help keep the vehicle under control.
{ Warning
{ Warning
If the vehicle has the two‐speed automatic transfer case, shifting the transfer case to N (Neutral) can cause your vehicle to roll even if the transmission is in P (Park). This is because the N (Neutral) position on the
(Continued)
Heavy braking when going down a hill can cause your brakes to overheat and fade. This could cause loss of control and you or others could be injured or killed. Apply the brakes lightly when
(Continued)
descending a hill and use a low gear to keep vehicle speed under control.
If the vehicle stalls on a hill: 1. Apply the brakes to stop the vehicle, and then apply the parking brake.
2. Shift into P (Park) and then
restart the engine.
If driving uphill when the vehicle stalls, shift to R (Reverse), release the parking brake, and back straight down.
. Never try to turn the vehicle
around. If the hill is steep enough to stall the vehicle, it is steep enough to cause it to roll over. If you cannot make it up the hill, back straight down the hill.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
. Never back down a hill in N (Neutral) using only the brake. The vehicle can roll backward quickly and you could lose control. If driving downhill when the vehicle stalls, shift to a lower gear, release the parking brake, and drive straight down the hill.
If the vehicle cannot be restarted after stalling, set the parking brake, shift into P (Park), and turn the vehicle off. 3.1. Leave the vehicle and
seek help.
3.
3.2. Stay clear of the path the
vehicle would take if it rolled downhill.
. Avoid turns that take the vehicle
across the incline of the hill. A hill that can be driven straight up or down might be too steep to drive across. Driving across an incline puts more weight on the
downhill wheels, which could cause a downhill slide or a rollover.
. Surface conditions can be a
problem. Loose gravel, muddy spots, or even wet grass can cause the tires to slip sideways, downhill. If the vehicle slips sideways, it can hit something that will trip it — a rock, a rut, etc. — and roll over.
. Hidden obstacles can make the
steepness of the incline more severe. If a rock is driven across with the uphill wheels, or if the downhill wheels drop into a rut or depression, the vehicle can tilt even more. If an incline must be driven across, and the vehicle starts to slide, turn downhill. This should help straighten out the vehicle and prevent the side slipping.
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{ Warning
Getting out of the vehicle on the downhill side when stopped across an incline is dangerous. If the vehicle rolls over, you could be crushed or killed. Always get out on the uphill side of the vehicle and stay well clear of the rollover path.
Driving in Mud, Sand, Snow, or Ice Use a low gear when driving in mud — the deeper the mud, the lower the gear. Keep the vehicle moving to avoid getting stuck. Traction changes when driving on sand. On loose sand, such as on beaches or sand dunes, the tires tend to sink into the sand. This affects steering, accelerating, and braking. Drive at a reduced speed and avoid sharp turns or abrupt maneuvers.
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Traction is reduced on hard packed snow and ice and it is easy to lose control. Reduce vehicle speed when driving on hard packed snow and ice.
{ Warning
Driving on frozen lakes, ponds, or rivers can be dangerous. Ice conditions vary greatly and the vehicle could fall through the ice; you and your passengers could drown. Drive your vehicle on safe surfaces only.
Driving in Water
{ Warning
Driving through rushing water can be dangerous. Deep water can sweep your vehicle downstream and you and your passengers could drown. If it is only shallow water, it can still wash away the ground from under your tires.
(Continued)
Warning (Continued)
Traction could be lost, and the vehicle could roll over. Do not drive through rushing water.
Caution
Do not drive through standing water if it is deep enough to cover the wheel hubs, axles, or exhaust pipe. Deep water can damage the axle and other vehicle parts.
If the standing water is not too deep, drive slowly through it. At faster speeds, water splashes and the vehicle can stall. When going through water, the brakes get wet and it may take longer to stop. See “Driving on Wet Roads” later in this section.
After Off-Road Driving Remove any brush or debris that has collected on the underbody or chassis, or under the hood. These accumulations can be a fire hazard. After operation in mud or sand, have the brake linings cleaned and checked. These substances can cause glazing and uneven braking. Check the body structure, steering, suspension, wheels, tires, and exhaust system for damage and check the fuel lines and cooling system for any leakage. More frequent maintenance service is required. See the Maintenance Schedule 0 346.
Driving on Wet Roads Rain and wet roads can reduce vehicle traction and affect your ability to stop and accelerate. Always drive slower in these types of driving conditions and avoid driving through large puddles and deep-standing or flowing water.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
{ Warning
Wet brakes can cause crashes. They might not work as well in a quick stop and could cause pulling to one side. You could lose control of the vehicle. After driving through a large puddle of water or a car/vehicle wash, lightly apply the brake pedal until the brakes work normally. Flowing or rushing water creates strong forces. Driving through flowing water could cause the vehicle to be carried away. If this happens, you and other vehicle occupants could drown. Do not ignore police warnings and be very cautious about trying to drive through flowing water.
Hydroplaning Hydroplaning is dangerous. Water can build up under the vehicle's tires so they actually ride on the water. This can happen if the road is
wet enough and you are going fast enough. When the vehicle is hydroplaning, it has little or no contact with the road. There is no hard and fast rule about hydroplaning. The best advice is to slow down when the road is wet. Other Rainy Weather Tips Besides slowing down, other wet weather driving tips include: . Allow extra following distance. . Pass with caution. . Keep windshield wiping
equipment in good shape.
. Keep the windshield washer fluid
reservoir filled.
. Have good tires with proper
tread depth. See Tires 0 292.
. Turn off cruise control.
Hill and Mountain Roads Driving on steep hills or through mountains is different than driving on flat or rolling terrain. Tips include:
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. Keep the vehicle serviced and in
good shape.
. Check all fluid levels and brakes,
tires, cooling system, and transmission.
. Shift to a lower gear when going
down steep or long hills.
{ Warning
Using the brakes to slow the vehicle on a long downhill slope can cause brake overheating, can reduce brake performance, and could result in a loss of braking. Shift the transmission to a lower gear to let the engine assist the brakes on a steep downhill slope.
{ Warning
Coasting downhill in N (Neutral) or with the ignition off is dangerous. This can cause overheating of the brakes and
(Continued)
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Warning (Continued)
loss of steering. Always have the engine running and the vehicle in gear.
. Drive at speeds that keep the vehicle in its own lane. Do not swing wide or cross the center line.
. Be alert on top of hills;
something could be in your lane (e.g., stalled car, accident).
. Pay attention to special road signs (e.g., falling rocks area, winding roads, long grades, passing or no-passing zones) and take appropriate action.
Winter Driving
Driving on Snow or Ice Snow or ice between the tires and the road creates less traction or grip, so drive carefully. Wet ice can occur at about 0 °C (32 °F) when
freezing rain begins to fall. Avoid driving on wet ice or in freezing rain until roads can be treated.
For Slippery Road Driving: . Accelerate gently. Accelerating
too quickly causes the wheels to spin and makes the surface under the tires slick.
. Turn on Traction Control. See
Traction Control/Electronic Stability Control 0 208.
. The Antilock Brake System
(ABS) improves vehicle stability during hard stops, but the brakes should be applied sooner than when on dry pavement. See Antilock Brake System (ABS) 0 206.
. Allow greater following distance and watch for slippery spots. Icy patches can occur on otherwise clear roads in shaded areas. The surface of a curve or an overpass can remain icy when the surrounding roads are clear. Avoid sudden steering maneuvers and braking while on ice.
. Turn off cruise control. Blizzard Conditions Stay with the vehicle unless there is help nearby. If possible, use Roadside Assistance. See Roadside Assistance Program 0 367. To get help and keep everyone in the vehicle safe: . Turn on the hazard warning
flashers.
. Tie a red cloth to an outside
mirror.
{ Warning
Snow can trap engine exhaust under the vehicle. This may cause exhaust gases to get inside. Engine exhaust contains carbon monoxide (CO), which cannot be seen or smelled. It can cause unconsciousness and even death.
(Continued)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Warning (Continued)
If the vehicle is stuck in snow:
. Clear snow from the base of
the vehicle, especially any blocking the exhaust pipe. . Open a window about 5 cm
(2 in) on the vehicle side that is away from the wind, to bring in fresh air.
. Fully open the air outlets on
or under the instrument panel.
. Adjust the climate control system to circulate the air inside the vehicle and set the fan speed to the highest setting. See “Climate Control Systems.”
For more information about CO, see Engine Exhaust 0 192.
To save fuel, run the engine for short periods to warm the vehicle and then shut the engine off and partially close the window. Moving about to keep warm also helps. If it takes time for help to arrive, when running the engine, push the accelerator pedal slightly so the engine runs faster than the idle speed. This keeps the battery charged to restart the vehicle and to signal for help with the headlamps. Do this as little as possible, to save fuel.
If the Vehicle Is Stuck Slowly and cautiously spin the wheels to free the vehicle when stuck in sand, mud, ice, or snow. See “Rocking the Vehicle to Get It Out” later in this section. The Traction Control System (TCS) can often help to free a stuck vehicle. See Traction Control/ Electronic Stability Control 0 208. If TCS cannot free the vehicle, see “Rocking the Vehicle to Get it Out” following.
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{ Warning
If the vehicle's tires spin at high speed, they can explode, and you or others could be injured. The vehicle can overheat, causing an engine compartment fire or other damage. Spin the wheels as little as possible and avoid going above 56 km/h (35 mph).
For information about using tire chains on the vehicle, see Tire Chains 0 314. Rocking the Vehicle to Get It Out Turn the steering wheel left and right to clear the area around the front wheels. For four-wheel-drive vehicles, shift into Four-Wheel Drive High. Turn the TCS off. Shift back and forth between R (Reverse) and a forward gear, spinning the wheels as little as possible. To prevent transmission wear, wait until the wheels stop spinning before shifting gears. Slowly spinning the wheels in the forward and reverse directions
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causes a rocking motion that could free the vehicle. If that does not get the vehicle out after a few tries, it might need to be towed out. See Towing the Vehicle 0 331. Recovery hooks can be used, if the vehicle has them. Recovery Hooks
{ Warning
Never pull on recovery hooks from the side. The hooks could break and you and others could be injured. When using recovery hooks, always pull the vehicle from the front.
Vehicle Load Limits It is very important to know how much weight the vehicle can carry. This weight is called the vehicle capacity weight and includes the weight of all occupants, cargo, and all nonfactory-installed options. Two labels on the vehicle may show how much weight it was designed to carry: the Tire and Loading Information label and the Certification/Tire label.
{ Warning
Do not load the vehicle any heavier than the Gross Vehicle Weight Rating (GVWR), or either the maximum front or rear Gross Axle Weight Rating (GAWR). This can cause systems to break and change the way the vehicle handles. This could cause loss of control and a
(Continued)
Caution
Do not drive through standing water if it is deep enough to cover the wheel hubs, axles, or exhaust pipe. Deep water can damage the axle and other vehicle parts.
There are recovery hooks at the front of the vehicle. Use them if the vehicle is stuck off-road and needs to be pulled some place to continue driving.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Warning (Continued)
crash. Overloading can also reduce stopping distance, damage the tires, and shorten the life of the vehicle.
Tire and Loading Information Label
Label Example
A vehicle-specific Tire and Loading Information label is attached to the center pillar (B-pillar). The Tire and Loading Information label shows the
number of occupant seating positions (1), and the maximum vehicle capacity weight (2) in kilograms and pounds. The Tire and Loading Information label also shows the size of the original equipment tires (3) and the recommended cold tire inflation pressures (4). For more information on tires and inflation see Tires 0 292
and Tire Pressure 0 300. There is also important loading information on the vehicle Certification/Tire label. It may show the Gross Vehicle Weight Rating (GVWR) and the Gross Axle Weight Rating (GAWR) for the front and rear axles. See “Certification/Tire Label” later in this section. “Steps for Determining Correct Load Limit– 1. Locate the statement "Thecombined weight of occupants and cargo should
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never exceed XXX kg or XXX lbs." on your vehicle’s placard.
2. Determine the combined weight of the driver and passengers that will be riding in your vehicle.
3. Subtract the combined weight of the driver and passengers from XXX kg or XXX lbs.
4. The resulting figure equals
the available amount of cargo and luggage load capacity. For example, if the "XXX" amount equals 1400 lbs. and there will be five 150 lb passengers in your vehicle, the amount of available cargo and luggage load capacity is 650 lbs. (1400-750 (5 x 150) = 650 lbs.)
5. Determine the combined
weight of luggage and cargo being loaded on the vehicle.
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6.
That weight may not safely exceed the available cargo and luggage load capacity calculated in Step 4. If your vehicle will be towing a trailer, load from your trailer will be transferred to your vehicle. Consult this manual to determine how this reduces the available cargo and luggage load capacity of your vehicle.” See Trailer Towing 0 231 for important information on towing a trailer, towing safety rules, and trailering tips.
Example 1
Example 2
1. Vehicle Capacity Weight for
1. Vehicle Capacity Weight for
Example 1 = (453 kg) (1,000 lb)
Example 2 = 453 kg (1,000 lb)
2. Subtract Occupant Weight
2. Subtract Occupant Weight
@ 68 kg (150 lb) × 2 = 136 kg (300 lb)
3. Available Occupant and Cargo Weight = 317 kg (700 lb)
@ 68 kg (150 lb) × 5 = 340 kg (750 lb)
3. Available Cargo Weight =
113 kg (250 lb)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
of the driver, passengers, and cargo should never exceed the vehicle's capacity weight.
Certification/Tire Label
Example 3
1. Vehicle Capacity Weight for
Example 3 = 453 kg (1,000 lb)
2. Subtract Occupant Weight
@ 91 kg (200 lb) × 5 = 453 kg (1,000 lb)
3. Available Cargo Weight =
0 kg (0 lb)
Refer to the Tire and Loading Information label for specific information about the vehicle's capacity weight and seating positions. The combined weight
A vehicle-specific Certification/ Tire label is label is attached to the center pillar (B-pillar). The label may show the size of the vehicle's original tires and the inflation pressures needed to obtain the gross weight capacity of the vehicle. This is called Gross Vehicle Weight Rating (GVWR). The GVWR
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includes the weight of the vehicle, all occupants, fuel, and cargo. The Certification/Tire label also may show the maximum weights for the front and rear axles, called Gross Axle Weight Rating (GAWR). To determine the actual loads on the front and rear axles, weigh the vehicle at a weigh station. Your dealer can help with this. Be sure to spread the load equally on both sides of the centerline. The Certification/Tire label also contains important information about the Front Axle Reserve Capacity. See Adding a Snow Plow or Similar Equipment 0 247.
{ Warning
In the case of a sudden stop or collision, things carried in the bed of your truck could
(Continued)
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Warning (Continued)
shift forward and come into the passenger area, injuring you and others. If you put things in the bed of your truck, you should make sure they are properly secured.
Caution
Overloading the vehicle may cause damage. Repairs would not be covered by the vehicle warranty. Do not overload the vehicle.
Using heavier suspension components to get added durability might not change the weight ratings. Ask your dealer to help load the vehicle the right way.
{ Warning
Things you put inside the vehicle can strike and injure people in a sudden stop or turn, or in a crash.
. Put things in the cargo
area of the vehicle. Try to spread the weight evenly.
. Never stack heavier
things, like suitcases, inside the vehicle so that some of them are above the tops of the seats.
. Do not leave an
unsecured child restraint in the vehicle.
. When you carry
something inside the vehicle, secure it whenever you can. . Do not leave a seat
folded down unless you need to.
There is also important loading information for off-road driving in this manual. See “Loading the Vehicle for Off-Road Driving“ under Off-Road Driving 0 168.
Two-Tiered Loading Depending on the model of the pickup, an upper load platform can be created by positioning three or four 5 cm (2 in) by 15 cm (6 in) wooden planks across the width of the pickup box. The planks must be inserted in the pickup box depressions. When using this upper load platform, be sure the load is securely tied down to prevent it from shifting. The load's center of gravity should be positioned in a zone over the rear axle. The zone is located in the area between the front of each wheel well and the rear of each wheel
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Remember not to exceed the Gross Axle Weight Rating (GAWR) of the front or rear axle.
* Equipment Ladder Rack and Cargo Cross Toolbox and Cargo Side Boxes and Cargo
Maximum Weight 340 kg (750 lb)
181 kg (400 lb)
113 kg per side (250 lb per side)
* The combined weight for all rail-mounted equipment should not exceed 454 kg (1,000 lb).
well. The center of gravity height must not extend above the top of the pickup box flareboard. Any load that extends beyond the vehicle's taillamp area must be properly marked according to local laws and regulations. Remember not to exceed the Gross Axle Weight Rating (GAWR) of the front or rear axle.
Add-On Equipment When carrying removable items, a limit on how many people carried inside the vehicle may be necessary. Be sure to weigh the vehicle before buying and installing the new equipment.
Caution
Overloading the vehicle may cause damage. Repairs would not be covered by the vehicle warranty. Do not overload the vehicle.
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Loading Points
1. Primary Load Points 2. Secondary Load Areas 3. GM Approved Accessory
Mounting Points
Structural members (1) and (2) are included in the pickup box design. Additional accessories should use these load points. Depending on the accessory design, use a spacer under the accessory at the load points to remove gap. The holes for GM approved accessories (3) are not intended for aftermarket
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equipment. See www.gmupfitter.com for additional pickup box load bearing structural information.
Truck-Camper Loading Information A vehicle-specific Truck-Camper Loading Information label is attached to the inside of the vehicle's glove box. This label indicates if a slide-in camper can be carried, how much of a load the vehicle can carry, and how to correctly spread out the load. It will help to match the right slide-in camper to the vehicle. Your dealer can help make a good vehicle-camper match and help determine the Cargo Weight Rating (CWR). When installing and loading a slide-in camper, check the manufacturer's instructions.
When carrying a slide-in camper, the total cargo load of the vehicle is the weight of the camper plus: . Everything added to the
camper after it left the factory.
. Everything in the camper. . All the people inside. The CWR is the maximum weight of the load the vehicle can carry. It does not include the weight of the people inside. But, use about 68 kg (150 lb) for each seat. The total cargo load must not be more than the vehicle's CWR. Refer to the Truck-Camper Loading Information label in the glove box for dimensions A and B as shown in the following illustration.
Use the rear edge of the load floor for measurement purposes. The recommended location for the cargo center of gravity is at point C for the CWR. It is the point where the mass of a body is concentrated and, if suspended at that point, would balance the front and rear.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Here is an example of proper truck and camper match:
1. Camper Center of
Gravity
2. Recommended Center of
Gravity Location Zone
When the truck is used to carry a slide-in camper, the total cargo load of the truck consists of the manufacturer's camper weight figure, the weight of installed additional camper equipment not included in the manufacturer's camper weight figure, the weight of camper cargo, and the weight
of passengers in the camper. The total cargo load should not exceed the truck's cargo weight rating, and the camper's center of gravity (1) should fall within the truck's recommended center of gravity zone (2) when installed. Any accessories or other equipment that are added to the vehicle must be weighed. Then, subtract this extra weight from the CWR. This extra weight may shorten the center of gravity zone of the vehicle. If the slide-in camper and its load weighs less than the CWR, the center of gravity zone for the vehicle may be larger. Secure loose items to prevent weight shifts that could affect the balance of the vehicle. When the truck-camper is loaded, drive to a scale and weigh on the front and on the rear wheels separately to determine axle loads. Individual axle loads
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should not exceed either of the gross axle weight ratings (GAWR). The total axle loads should not exceed the vehicle's gross vehicle weight rating (GVWR). These ratings are given on the Certification/Tire label attached to the B-pillar. See “Certification/Tire Label” under Vehicle Load Limits 0 176
. If weight ratings are exceeded, move or remove items to bring all weights below the ratings. See your dealer for more information on curb weights, cargo weights, Cargo Weight Rating, and the correct center of gravity zone.GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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Starting and Operating
New Vehicle Break-In
Caution
The vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines:
. Keep the vehicle speed at
88 km/h (55 mph) or less for the first 805 km (500 mi). . Do not drive at any one
constant speed, fast or slow, for the first 805 km (500 mi). Do not make full-throttle starts. Avoid downshifting to brake or slow the vehicle.
. Avoid making hard stops for
the first 322 km (200 mi) or so. During this time the new brake linings are not yet broken in. Hard stops with new linings can mean
(Continued)
Caution (Continued)
premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings.
. Do not tow a trailer during
break-in. See Trailer Towing 0 231 for the trailer towing capabilities of the vehicle and more information.
Following break-in, engine speed and load can be gradually increased.
Adjustable Throttle and Brake Pedal If equipped, the position of the throttle and brake pedals can be changed. The pedals can only be adjusted when the vehicle is in P (Park).
The switch used to adjust the pedals is on the center stack, below the climate controls. Lift the switch up to move the pedals closer to your body. Press the switch down to move the pedals away. Before you start driving, fully press the brake pedal to confirm the adjustment is right for you. The vehicle may have a memory function, which lets pedal settings be saved and recalled. See Memory Seats 0 51.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Ignition Positions
Vehicles with Key Access have an ignition switch with four different positions. To shift out of P (Park), the ignition must be in ON/RUN or ACC/ ACCESSORY and the regular brake pedal must be applied. 0 (STOPPING THE ENGINE/LOCK/ OFF) : When the vehicle is stopped, turn the ignition switch to LOCK/ OFF to turn the engine off. Retained Accessory Power (RAP) will remain active. See Retained Accessory Power (RAP) 0 189.
This position locks the ignition and steering wheel. It also locks the transmission on automatic transmission vehicles. The key can be removed in LOCK/OFF. The steering can bind with the wheels turned off center. If this happens, move the steering wheel from right to left while turning the key to ACC/ACCESSORY. If this does not work, then the vehicle needs service. Do not turn the engine off when the vehicle is moving. This will cause a loss of power assist in the brake and steering systems and disable the airbags. If the vehicle must be shut off in an emergency: 1. Brake using a firm and steady
pressure. Do not pump the brakes repeatedly. This may deplete power assist, requiring increased brake pedal force.
2. Shift the vehicle to N (Neutral).
This can be done while the vehicle is moving. After shifting
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to N (Neutral), firmly apply the brakes and steer the vehicle to a safe location.
3. Come to a complete stop, shift
to P (Park), and turn the ignition to LOCK/OFF. On vehicles with an automatic transmission, the shift lever must be in P (Park) to turn the ignition switch to the LOCK/ OFF position.
4. Set the parking brake. See
Parking Brake 0 207. { Warning
Turning off the vehicle while moving may cause loss of power assist in the brake and steering systems and disable the airbags. While driving, only shut the vehicle off in an emergency.
If the vehicle cannot be pulled over, and must be shut off while driving, turn the ignition to ACC/ ACCESSORY.
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Caution
Using a tool to force the key to turn in the ignition could cause damage to the switch or break the key. Use the correct key, make sure it is all the way in, and turn it only with your hand. If the key cannot be turned by hand, see your dealer.
1 (ACC/ACCESSORY) : This position lets things like the radio and the windshield wipers operate while the engine is off. It also unlocks the steering wheel. Use this position if the vehicle must be pushed or towed. 2 (ON/RUN) : This position can be used to operate the electrical accessories and to display some instrument cluster warning and indicator lights. This position can also be used for service and diagnostics, and to verify the proper operation of the malfunction indicator lamp as may be required for emission inspection purposes. The switch stays in this position
when the engine is running. The transmission is also unlocked in this position on automatic transmission vehicles. If the key is left in the ACC/ ACCESSORY or ON/RUN position with the engine off, the battery could be drained. The vehicle may not start if the battery is allowed to drain for an extended period of time. 3 (START) : This is the position that starts the engine. When the engine starts, release the key. The ignition switch returns to ON/RUN for driving. A warning tone will sound when the driver door is opened and the ignition is in ACC/ACCESSORY or LOCK/OFF, and the key is in the ignition.
Starting the Engine If the vehicle has a diesel engine, see the Duramax diesel supplement.
Caution
If you add electrical parts or accessories, you could change the way the engine operates. Any resulting damage would not be covered by the vehicle warranty. See Add-On Electrical Equipment 0 247.
Caution
If the steering wheel is turned until it reaches the end of its travel, and is held in that position while starting the vehicle, damage may occur to the hydraulic power steering system and there may be loss of power steering assist.
Move the shift lever to P (Park) or N (Neutral). To restart the engine when the vehicle is already moving, use N (Neutral) only.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Caution
Caution
Do not try to shift to P (Park) if the vehicle is moving. If you do, you could damage the transmission. Shift to P (Park) only when the vehicle is stopped.
Starting Procedure 1. Turn the ignition key to START. When the engine starts, let go of the key. The idle speed will go down as the engine gets warm. Do not race the engine immediately after starting it. Operate the engine and transmission gently to allow the oil to warm up and lubricate all moving parts. When the low fuel warning light is on and the FUEL LEVEL LOW message is displayed in the Driver Information Center (DIC), hold the ignition switch in the START position to continue engine cranking.
Cranking the engine for long periods of time, by returning the ignition to the START position immediately after cranking has ended, can overheat and damage the cranking motor, and drain the battery. Wait at least 15 seconds between each try, to let the cranking motor cool down.
2.
If the engine does not start after five to 10 seconds, especially in very cold weather (below −18 °C or 0 °F), it could be flooded with too much gasoline. Try pushing the accelerator pedal all the way to the floor and holding it there while holding the key in START for up to 15 seconds. Wait at least 15 seconds between each try, to allow the cranking motor to cool down. When the engine starts, let go of the key and
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accelerator. If the vehicle starts briefly but then stops again, do the same thing. This clears the extra gasoline from the engine. Do not race the engine immediately after starting it. Operate the engine and transmission gently until the oil warms up and lubricates all moving parts.
Fast Idle System If equipped, this feature is available only with cruise control. The manual fast idle switch is operated using the cruise control buttons on the left side of the steering wheel. This system can be used to increase engine idle speed whenever the following conditions are met: . The parking brake is set. . The brake pedal is not pressed. . The vehicle must not be moving and the accelerator must not be pressed.
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To control the fast idle: . To enable the Fast Idle System,
press and release the cruise control on/off button and ensure that the switch indicator light is lit.
. Press and release the cruise control SET- button. Engine speed will be held at approximately 1200 rpm.
One of the following actions will turn off the fast idle: . Pressing the brake. . Selecting the cruise control
cancel button.
. Releasing the parking brake. . Moving the transmission shift
lever out of P (Park) or N (Neutral).
. Selecting the cruise control on/
off button when it was previously on.
. Pressing the cruise control SET-
button a second time.
. Pressing the accelerator more
2. Open the hood and unwrap the
than one-quarter of the way down.
. Turning the ignition switch to the
LOCK/OFF position.
Engine Heater The engine heater can provide easier starting and better fuel economy during engine warm-up in cold weather conditions at or below −18 °C (0 °F). Vehicles with an engine heater should be plugged in at least four hours before starting. An internal thermostat in the plug-end of the cord may exist, which will prevent engine coolant heater operation at temperatures above −18 °C (0 °F). If the vehicle has a diesel engine, see the Duramax diesel supplement. To Use the Engine Coolant Heater 1. Turn off the engine.
electrical cord. The cord is secured to the driver side fender with a clip, next to the engine compartment fuse block. Carefully remove the wire tie that bundles the electrical plug. Do not cut the electrical cord. Check the heater cord for damage. If it is damaged, do not use it. See your dealer for a replacement. Inspect the cord for damage yearly.
3. Plug the cord into a normal, grounded 110-volt AC outlet.
{ Warning
Improper use of the heater cord or an extension cord can damage the cord and may result in overheating and fire.
. Plug the cord into a
three-prong electrical utility receptacle that is protected by a ground fault detection
(Continued)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Warning (Continued)
Warning (Continued)
function. An ungrounded outlet could cause an electric shock.
. Use a weatherproof,
heavy-duty, 15 amp-rated extension cord if needed. Failure to use the recommended extension cord in good operating condition, or using a damaged heater or extension cord, could make it overheat and cause a fire, property damage, electric shock, and injury.
. Do not operate the vehicle
with the heater cord permanently attached to the (Continued)
vehicle. Possible heater cord and thermostat damage could occur.
. While in use, do not let the
heater cord touch vehicle parts or sharp edges. Never close the hood on the heater cord.
. Before starting the vehicle,
unplug the cord, reattach the cover to the plug, and securely fasten the cord. Keep the cord away from any moving parts.
4. Before starting the engine, be
sure to unplug and store the cord as it was before to keep it away from moving engine parts. If you do not, it could be damaged.
The length of time the heater should remain plugged in depends on several factors. Ask a dealer in the area where you will be parking the vehicle for the best advice on this.
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Retained Accessory Power (RAP) The following vehicle accessories can be used for up to 10 minutes after the engine is turned off: . Audio System . Power Windows . OnStar System (if equipped) . Sunroof (if equipped) These features work when the key is in ON/RUN or ACC/ ACCESSORY. Once the key is turned from ON/RUN to LOCK/OFF, the windows and sunroof continue to work up to 10 minutes or until any door is opened. The radio continues to work for up to 10 minutes or until the driver door is opened.
Accessory Power Outlets (APOs) The vehicle may have APOs in several locations. See Power Outlets 0 102. The APOs in the console or center seat position are powered by RAP. They will continue to work for up to
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Driving and Operating
10 minutes after the key is turned from ON/RUN to LOCK/OFF, or until the driver door is opened. The APOs on the center stack come from the factory powered directly from the vehicle battery, and supply accessory power at all times, regardless of ignition key position. If electronic items are left plugged into these APOs for long periods of time with the vehicle off, the vehicle battery could be drained. The vehicle may not start if the battery is allowed to drain for an extended period of time.
Shifting Into Park { Warning
It can be dangerous to get out of the vehicle if the shift lever is not fully in P (Park) with the parking brake firmly set. The vehicle can roll. If you have left the engine running, the vehicle can move suddenly. You or others could be
(Continued)
Warning (Continued)
injured. To be sure the vehicle will not move, even when you are on fairly level ground, use the steps that follow. If the vehicle has a four-wheel drive transfer case with a N (Neutral) position, and the transfer case is in N (Neutral), the vehicle will be free to roll, even if the shift lever is in P (Park). Be sure the transfer case is in a drive gear. If towing a trailer, see Driving Characteristics and Towing Tips 0 228.
1. Hold the brake pedal down, then set the parking brake. See Parking Brake 0 207.
2. Move the shift lever into the
P (Park) position by pulling the shift lever toward you and moving it up as far as it will go. 3. Be sure the transfer case is in
a drive gear — not in N (Neutral).
4. Turn the ignition key to
LOCK/OFF.
5. Remove the key and take it
with you. If you can leave the vehicle with the ignition key in your hand, the vehicle is in P (Park).
Leaving the Vehicle with the Engine Running
{ Warning
It can be dangerous to leave the vehicle with the engine running. The vehicle could move suddenly if the shift lever is not fully in P (Park) with the parking brake firmly set. If you have four-wheel drive and the transfer case is in N (Neutral), the vehicle will be free to roll, even if the shift lever is in P (Park). So be sure the transfer case is in a drive gear — not in N (Neutral).
(Continued)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Warning (Continued)
And, if you leave the vehicle with the engine running, it could overheat and even catch fire. You or others could be injured. Do not leave the vehicle with the engine running unless you have to.
If you have to leave the vehicle with the engine running, be sure the vehicle is in P (Park) and the parking brake is firmly set before you leave it. After you move the shift lever into P (Park), hold the regular brake pedal down. Then, see if you can move the shift lever away from P (Park) without first pulling it toward you. If you can, it means that the shift lever was not fully locked into P (Park). Torque Lock If you are parking on a hill and you do not shift the transmission into P (Park) properly, the weight of the vehicle may put too much force on the parking pawl in the transmission. You may find it difficult
to pull the shift lever out of P (Park). This is called torque lock. To prevent torque lock, set the parking brake and then shift into P (Park) properly before you leave the driver seat. To find out how, see Shifting Into Park 0 190. When you are ready to drive, move the shift lever out of P (Park) before you release the parking brake. If torque lock does occur, you may need to have another vehicle push yours a little uphill to take some of the pressure from the parking pawl in the transmission. You will then be able to pull the shift lever out of P (Park).
Shifting out of Park This vehicle is equipped with an electronic shift lock release system. The shift lock release is designed to: . Prevent ignition key removal
unless the shift lever is in P (Park).
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191
. Prevent movement of the shift
lever out of P (Park), unless the ignition is in ON/RUN and the regular brake pedal is applied.
The shift lock release is always functional except in the case of an uncharged or low voltage (less than 9 volt) battery. If the vehicle has an uncharged battery or a battery with low voltage, try charging or jump starting the battery. See Jump Starting - North America 0 326. To shift out of P (Park): 1. Apply the brake pedal. 2. Move the shift lever to the
desired position.
If you still are unable to shift out of P (Park): 1. Ease the pressure on the shift
lever.
2. While holding down the brake pedal, press the shift lever all the way into P (Park).
3. Move the shift lever to the
desired position.
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If you are still having a problem shifting, then have the vehicle serviced soon. This vehicle may have the Safety Belt Assurance System, which may prevent the vehicle from shifting out of P (Park). See Safety Belt Messages 0 132.
Parking over Things That Burn
{ Warning
Things that can burn could touch hot exhaust parts under the vehicle and ignite. Do not park over papers, leaves, dry grass, or other things that can burn.
Active Fuel Management® Vehicles with V8 engines may have Active Fuel Management. This system allows the engine to operate on either all or half of its cylinders, depending on the driving conditions. When less power is required, such as cruising at a constant vehicle speed, the system will operate in the half cylinder mode, allowing the vehicle to achieve better fuel economy. When greater power demands are required, such as accelerating from a stop, passing, or merging onto a freeway, the system will maintain full-cylinder operation. If the vehicle has an Active Fuel Management indicator, see Driver Information Center (DIC) 0 123 for more information on using this display.
Engine Exhaust { Warning
Engine exhaust contains carbon monoxide (CO) which cannot be seen or smelled. Exposure to CO can cause unconsciousness and even death. Exhaust may enter the vehicle if:
. The vehicle idles in areas
with poor ventilation (parking garages, tunnels, deep snow that may block underbody airflow or tail pipes).
. The exhaust smells or
sounds strange or different. . The exhaust system leaks
due to corrosion or damage. . The vehicle exhaust system
has been modified, damaged, or improperly repaired.
(Continued)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Running the Vehicle While Parked It is better not to park with the engine running. If the vehicle is left with the engine running, follow the proper steps to be sure the vehicle will not move. See Shifting Into Park 0 190 and Engine Exhaust 0 192. If parking on a hill and pulling a trailer, see Driving Characteristics and Towing Tips 0 228.
Warning (Continued)
. There are holes or openings
in the vehicle body from damage or aftermarket modifications that are not completely sealed.
If unusual fumes are detected or if it is suspected that exhaust is coming into the vehicle:
. Drive it only with the
windows completely down. . Have the vehicle repaired
immediately.
Never park the vehicle with the engine running in an enclosed area such as a garage or a building that has no fresh air ventilation.
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193
Automatic Transmission If equipped, there is an electronic shift lever position indicator within the instrument cluster. This display comes on when the ignition key is turned to the ON/RUN position. There are several different positions for the shift lever.
Heavy-Duty 6-Speed Automatic Transmission Shown, Others
Similar
See “Range Selection Mode” under Manual Mode 0 196.
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P : This position locks the rear wheels. It is the best position to use when starting the engine because the vehicle cannot move easily. When parked on a hill, especially when the vehicle has a heavy load, you might notice an increase in the effort to shift out of P (Park). See “Torque Lock” under Shifting Into Park 0 190.
{ Warning
It is dangerous to get out of the vehicle if the shift lever is not fully in P (Park) with the parking brake firmly set. The vehicle can roll. Do not leave the vehicle when the engine is running. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure the vehicle will not move, even when you are on fairly level ground, always set the parking brake and move the shift lever to P (Park). See Shifting Into Park 0 190 and Driving Characteristics and Towing Tips 0 228.
{ Warning
If you have four-wheel drive, the vehicle will be free to roll — even if the shift lever is in P (Park) — if the transfer case is in N (Neutral). So, be sure the transfer case is in a drive gear, Two-Wheel Drive High or Four-Wheel Drive High or Four-Wheel Drive Low — not in N (Neutral). See Shifting Into Park 0 190.
R : Use this gear to back up.
Caution
Shifting to R (Reverse) while the vehicle is moving forward could damage the transmission. The repairs would not be covered by the vehicle warranty. Shift to R (Reverse) only after the vehicle is stopped.
To rock the vehicle back and forth to get out of snow, ice, or sand without damaging the transmission, see If the Vehicle Is Stuck 0 175. N : In this position, the engine does not connect with the wheels. To restart when you are already moving, use N (Neutral) only. Also, use N (Neutral) when the vehicle is being towed.
{ Warning
Shifting into a drive gear while the engine is running at high speed is dangerous. Unless your foot is firmly on the brake pedal, the vehicle could move very rapidly. You could lose control and hit people or objects. Do not shift into a drive gear while the engine is running at high speed.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Caution
Shifting out of P (Park) or N (Neutral) with the engine running at high speed may damage the transmission. The repairs would not be covered by the vehicle warranty. Be sure the engine is not running at high speed when shifting the vehicle.
D : This position is for normal driving. It provides the best fuel economy. If you need more power for passing, and you are: . Going less than about 55 km/h (35 mph), push the accelerator pedal about halfway down.
. Going about 55 km/h (35 mph) or
more, push the accelerator all the way down. By doing this, the vehicle shifts down to the next gear and has more power.
Use D (Drive) and Tow/Haul Mode when towing a trailer, carrying a heavy load, driving on steep hills,
or driving off-road. Shift the transmission to a lower gear selection if the transmission shifts too often. Downshifting the transmission in slippery road conditions could result in skidding. See “Skidding” under Loss of Control 0 167. The vehicle has a shift stabilization feature that adjusts the transmission shifting to the current driving conditions in order to reduce rapid upshifts and downshifts. This shift stabilization feature is designed to determine, before making an upshift, if the engine is able to maintain vehicle speed by analyzing things such as vehicle speed, throttle position, and vehicle load. If the shift stabilization feature determines that a current vehicle speed cannot be maintained, the transmission does not upshift and instead holds the current gear. In some cases, this could appear to be a delayed shift, however the transmission is operating normally.
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The transmission uses adaptive shift controls. The adaptive shift control process continually compares key shift parameters to pre-programmed ideal shifts stored in the transmission’s computer. The transmission constantly makes adjustments to improve vehicle performance according to how the vehicle is being used, such as with a heavy load or when the temperature changes. During this adaptive shift control process, shifting might feel different as the transmission determines the best settings. When temperatures are very cold, the transmission's gear shifting could be delayed providing more stable shifts until the engine warms up. Shifts could be more noticeable with a cold transmission. This difference in shifting is normal. M : This position allows selection of a range of gears appropriate for current driving conditions. If equipped, see “Range Selection Mode” under Manual Mode 0 196.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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 0 133. For other forms of grade braking, see Tow/Haul Mode 0 199 and Cruise Control 0 211. Kickdown Mode The accelerator pedal provides an additional downshift after pressing through the kickdown feature. It requires extra pedal pressure near the end of its travel to engage.
Manual Mode
Range Selection Mode
If equipped, Range Selection Mode helps control the vehicle's transmission and vehicle speed while driving downhill or towing a trailer by letting you select a desired range of gears.
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Driving and Operating
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.
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 0 133.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
This number is the highest gear that the transmission will command while operating in M (Manual Mode). All gears below that number are available. As driving conditions change, the transmission can automatically shift to lower gears. For example, when M5 is selected, 1 (First) through 5 (Fifth) gears are automatically shifted by the transmission, but 6 (Sixth) cannot be used until the plus/minus button on the shift lever is used to change to the range.
To use this feature: 1. Move the shift lever to
M (Manual Mode).
2. Tap the plus/minus buttons on
the shift lever to select the desired range of gears for current driving conditions.
With an 8–speed automatic transmission, hold the plus/minus buttons on the shift lever to select the highest or lowest range available for the current vehicle speed. When the shift lever is moved from D (Drive) to M (Manual Mode), a number displays next to the M, indicating the current transmission range.
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In vehicles with gasoline engines, when the shift lever is moved from D (Drive) to M (Manual Mode), a downshift may occur. The gear that the transmission is operating in when the shift lever is moved from D (Drive) to M (Manual Mode) determines if a downshift occurs. See the following chart.
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6-Speed Automatic Transmission Gear before shifting from D (Drive) to M (Manual Mode) Range after shifting from D (Drive) to M (Manual Mode)
6th
5th
4th
3rd
2nd
1st
M4
M4
M3
M2
M2
M1
7th
8th
8-Speed Automatic Transmission Gear before shifting from D (Drive) to M (Manual Mode) Range after shifting from D (Drive) to M (Manual Mode) – Tow/Haul not engaged Range after shifting from D (Drive) to M (Manual Mode) – Tow/Haul engaged
M6
M6
M6
M5
6th
5th
4th
3rd
2nd
1st
M5
M4
M3
M3
M2
M1
M4
M3
M3
M3
M2
M1
Grade Braking is not available when Range Selection Mode is active. See Tow/Haul Mode 0 199. While using Range Selection Mode, cruise control and the Tow/Haul Mode can be used. If the vehicle has an exhaust brake, it can also be used, but will not automatically downshift the transmission. See “Exhaust Brake” in the Duramax diesel supplement.
Caution
