2012 GMC Acadia Owners Manual

might not perform properly. Any resulting damage would not be covered by the vehicle warranty.

Engine Heater The engine coolant heater can provide easier starting and better fuel economy during engine warm-up in cold weather conditions at or below 0°F (−18°C). Vehicles with an engine coolant heater should be plugged in at least four hours before starting. Some models may have an internal thermostat in the cord which will prevent engine coolant heater operation at temperatures above 0°F (−18°C). To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap

the electrical cord. The cord is located on the driver side of the engine compartment. It is routed around the windshield washer fluid reservoir.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (18,1)

9-18

Driving and Operating

3. Plug the cord into a normal, grounded 110-volt AC outlet.

{ WARNING Plugging the cord into an ungrounded outlet could cause an electrical shock. Also, the wrong kind of extension cord could overheat and cause a fire. You could be seriously injured. Plug the cord into a properly grounded three-prong 110-volt AC outlet. If the cord will not reach, use a heavy-duty three-prong extension cord rated for at least 15 amps.

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.

Retained Accessory Power (RAP) These vehicle accessories can be used for up to 10 minutes after the ignition key is turned off: . Audio System . Power Windows . Sunroof (if equipped) Power to the windows and sunroof will work up to 10 minutes or until a door is opened. The radio continues to work for 10 minutes or until the driver door is opened. For an additional 10 minutes of operation, close all the doors and turn the key to ON/RUN and then back to LOCK/OFF.

All these features will work when the key is in the ON/RUN or ACC/ ACCESSORY positions.

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 injured. To be sure the vehicle will not move, even when you are on fairly level ground, use the steps that follow. If you are pulling a trailer, see Driving Characteristics and Towing Tips on page 9‑43.

1. Hold the brake pedal down and

set the parking brake. See Parking Brake on page 9‑26 for more information.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (19,1)

Driving and Operating

9-19

2. Move the shift lever into P (Park)

by holding in the button on the shift lever and pushing the shift lever all the way toward the front of the vehicle.

3. Turn the ignition key to

LOCK/OFF.

4. 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. And, if you leave the vehicle with the engine running, it could overheat and even catch

(Continued)

WARNING (Continued)

fire. You or others could be injured. Do not leave the vehicle with the engine running.

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 have moved 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 pushing the button. If you can, it means that the shift lever was not fully locked in P (Park). Torque Lock Torque lock is when the weight of the vehicle puts too much force on the parking pawl in the transmission. This happens when parking on a hill and shifting the transmission into P (Park) is not

done properly and then it is difficult to shift out of P (Park). To prevent torque lock, set the parking brake and then shift into P (Park). To find out how, see “Shifting Into Park” listed previously. If torque lock does occur, your vehicle may need to be pushed uphill by another vehicle to relieve the parking pawl pressure, so you can shift out of P (Park).

Shifting out of Park The 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) with the shift lever button fully released, and

. Prevent movement of the shift

lever out of P (Park), unless the ignition is in ON/RUN or ACC/ ACCESSORY and the regular brake pedal is applied.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (20,1)

9-20

Driving and Operating

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 on page 10‑73 for more information. To shift out of P (Park): 1. Apply the brake pedal. 2. Press the shift lever button. 3. Move the shift lever to the

desired position.

If you still are unable to shift out of P (Park): 1. Fully release the shift lever

button.

2. While holding down the brake

pedal, press the shift lever button again.

3. Move the shift lever to the

desired position.

If you still cannot move the shift lever from P (Park), see your dealer.

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.

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 Acadia/Acadia Denali Owner Manual - 2012

Black plate (21,1)

Driving and Operating

9-21

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.

Running the Vehicle While Parked It is better not to park with the engine running. But if you ever have to, here are some things to know.

{ WARNING

Idling a vehicle in an enclosed area with poor ventilation is dangerous. Engine exhaust may enter the vehicle. Engine exhaust contains Carbon Monoxide (CO) which cannot be seen or smelled. It can cause unconsciousness and even death. Never run the engine in an enclosed area that has no fresh air ventilation. For more information, see Engine Exhaust on page 9‑20.

{ WARNING

It can be dangerous to get out of the vehicle if the automatic transmission 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 unless you have to. 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).

Follow the proper steps to be sure the vehicle will not move. See Shifting Into Park on page 9‑18. If parking on a hill and pulling a trailer, see Driving Characteristics and Towing Tips on page 9‑43.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (22,1)

9-22

Driving and Operating

Automatic Transmission The automatic transmission has a shift lever located on the console between the seats.

P (Park): This position locks the front wheels. It is the best position to use when starting the engine because the vehicle cannot move easily.

{ 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 unless you have to. 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 on page 9‑18. If you are pulling a trailer, see Driving Characteristics and Towing Tips on page 9‑43.

Make sure the shift lever is fully in P (Park) before starting the engine. The vehicle has an automatic transmission shift lock control system. You must fully apply the

regular brake first and then press the shift lever button before shifting from P (Park) when the ignition key is in ON/RUN. If you cannot shift out of P (Park), ease pressure on the shift lever, then push the shift lever all the way into P (Park) as you maintain brake application. Then press the shift lever button and move the shift lever into another gear. See Shifting out of Park on page 9‑19. R (Reverse): Use this gear to back up. Notice: 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 on page 9‑9.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (23,1)

Driving and Operating

9-23

N (Neutral): In this position, the engine does not connect with the wheels. To restart the engine when the vehicle is 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.

Notice: 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 (Drive): 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 56 km/h

(35 mph), push the accelerator pedal about halfway down.

. Going about 56 km/h (35 mph) or

more, push the accelerator all the way down.

Notice: If the vehicle seems to accelerate slowly or not shift gears when you go faster, and you continue to drive the vehicle that way, you could damage the transmission. Have the vehicle serviced right away. You can drive in L (Low) when you are driving less than 56 km/h (35 mph) and D (Drive) for higher speeds until then. If the vehicle is stopped on a hill, with your foot off the brake pedal, the vehicle may roll. This is normal and is due to the torque converter designed to improve fuel economy

and performance. Use the brake to hold the vehicle on a hill. Do not use the accelerator pedal. L (Low): This position gives you access to gear ranges. This provides more engine braking but lower fuel economy than D (Drive). You can use it on very steep hills, or in deep snow or mud.

Manual Mode

Electronic Range Select (ERS) Mode ERS mode allows you to choose the top-gear limit of the transmission and the vehicle's speed while driving downhill or towing a trailer. The vehicle has an electronic shift position indicator within the instrument panel cluster. When using the ERS mode a number will display next to the L, indicating the current gear that has been selected.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (24,1)

9-24

Driving and Operating

To use this feature: 1. Move the shift lever to L (Low). 2. Press the plus/minus button located on the shift lever, to increase or decrease the gear range available.

When you shift from D (Drive) to L (Low), the transmission will shift to a pre-determined lower gear range. The highest gear available for this pre-determined range is displayed next to the L in the DIC. See Driver Information Center (DIC) (With DIC Buttons) on page 5‑24 or Driver Information Center (DIC) (Without DIC Buttons) on page 5‑29 for more information. The number displayed in the DIC is the highest gear that the transmission will be allowed to operate in. This means that all gears below that number are available. For example, when 4 (Fourth) is shown next to the L, 1 (First) through 4 (Fourth) gears are automatically shifted by the vehicle.

The transmission will not shift into 5 (Fifth) until the + (Plus) button is used or you shift back into D (Drive). While in L (Low), the transmission will prevent shifting to a lower gear range if the engine speed is too high. You have a brief period of time to slow the vehicle. If vehicle speed is not reduced within the time allowed, the lower gear range shift will not be completed. You must further slow the vehicle, then press the − (Minus) button to the desired lower gear range. Automatic Engine Grade Braking is not available when the ERS is active. It is available in D (Drive) for both normal and Tow/Haul mode. While using the ERS, cruise control and the Tow/Haul mode can be used. See Tow/Haul Mode following.

Tow/Haul Mode _ (Tow/Haul): The vehicle may have a Tow/Haul mode. The button is located on the instrument panel under the climate controls. Push the button to activate the system. Push it again to deactivate the system. You can use this feature to assist when towing or hauling a heavy load. When Tow/Haul is activated the Tow/Haul symbol will come on the instrument panel cluster. See “Tow/Haul Mode” under Driving Characteristics and Towing Tips on page 9‑43 for more information.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (25,1)

Driving and Operating

9-25

Drive Systems

Brakes

All-Wheel Drive Vehicles with this feature always send engine power to all four wheels. It is fully automatic, and adjusts itself as needed for road conditions. When using a compact spare tire on an AWD vehicle, the system automatically detects the compact spare and disables AWD. To restore AWD operation and prevent excessive wear on the system, replace the compact spare with a full-size tire as soon as possible. See Compact Spare Tire on page 10‑72 for more information.

Antilock Brake System (ABS) This vehicle has the Antilock Brake System (ABS), an advanced electronic braking system that helps prevent a braking skid. When the engine is started and the vehicle begins to drive away, ABS checks itself. A momentary motor or clicking noise might be heard while this test is going on, and it might even be noticed that the brake pedal moves a little. This is normal.

Automatic Engine Grade Braking Automatic Engine Grade Braking assists when driving on a downhill grade. It maintains vehicle speed by automatically implementing a shift schedule that uses the engine and the transmission to slow the vehicle. The system will automatically command downshifts to reduce vehicle speed, until the brake pedal is no longer being pressed. While in the Electronic Range Select (ERS) mode, grade braking is deactivated, allowing the driver to select a range and limiting the highest gear available. Grade braking is available for normal driving and in Tow/Haul mode. See Automatic Transmission on page 9‑22.

If there is a problem with ABS, this warning light stays on. See Antilock Brake System (ABS) Warning Light on page 5‑20.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (26,1)

9-26

Driving and Operating

If driving safely on a wet road and it becomes necessary to slam on the brakes and continue braking to avoid a sudden obstacle, a computer senses that the wheels are slowing down. If one of the wheels is about to stop rolling, the computer will separately work the brakes at each wheel. ABS can change the brake pressure to each wheel, as required, faster than any driver could. This can help the driver steer around the obstacle while braking hard. As the brakes are applied, the computer keeps receiving updates on wheel speed and controls braking pressure accordingly. Remember: ABS does not change the time needed to get a foot up to the brake pedal or always decrease stopping distance. If you get too close to the vehicle in front of you,

there will not be enough time to apply the brakes if that vehicle suddenly slows or stops. Always leave enough room up ahead to stop, even with ABS. Using ABS Do not pump the brakes. Just hold the brake pedal down firmly and let ABS work. You might hear the ABS pump or motor operating and feel the brake pedal pulsate, but this is normal. Braking in Emergencies ABS allows the driver to steer and brake at the same time. In many emergencies, steering can help more than even the very best braking.

Parking Brake

To set the parking brake, hold the regular brake pedal down, then push the parking brake pedal down. If the ignition is on, the brake system warning light will come on. See Brake System Warning Light on page 5‑19.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (27,1)

Notice: Driving with the parking brake on can overheat the brake system and cause premature wear or damage to brake system parts. Make sure that the parking brake is fully released and the brake warning light is off before driving. To release the parking brake, hold the regular brake pedal down, then push down momentarily on the parking brake pedal until you feel the pedal release. Slowly pull your foot up off the park brake pedal. If the parking brake is not released when you begin to drive, the brake system warning light will be on and a chime will sound warning you that the parking brake is still on. If you are towing a trailer and are parking on a hill, see Driving Characteristics and Towing Tips on page 9‑43.

Driving and Operating

9-27

Hill Start Assist (HSA) This vehicle has a Hill Start Assist (HSA) feature, which may be useful when the vehicle is stopped on a grade. This feature is designed to prevent the vehicle from rolling, either forward or rearward, during vehicle drive off. After the driver completely stops and holds the vehicle in a complete standstill on a grade, HSA will be automatically activated. During the transition period between when the driver releases the brake pedal and starts to accelerate to drive off on a grade, HSA holds the braking pressure to ensure that there is no rolling. The brakes will automatically release when the accelerator pedal is applied within the two‐second window. It will not activate if the vehicle is in a drive gear and facing downhill or if the vehicle is facing uphill and in R (Reverse).

Brake Assist This vehicle has a brake assist feature designed to assist the driver in stopping or decreasing vehicle speed in emergency driving conditions. This feature uses the stability system hydraulic brake control module to supplement the power brake system under conditions where the driver has quickly and forcefully applied the brake pedal in an attempt to quickly stop or slow down the vehicle. The stability system hydraulic brake control module increases brake pressure at each corner of the vehicle until the ABS activates. Minor brake pedal pulsation or pedal movement during this time is normal and the driver should continue to apply the brake pedal as the driving situation dictates. The brake assist feature will automatically disengage when the brake pedal is released or brake pedal pressure is quickly decreased.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (28,1)

9-28

Driving and Operating

Ride Control Systems

StabiliTrak® System The vehicle has the StabiliTrak system which combines antilock brake, traction, and stability control systems and helps the driver maintain directional control of the vehicle in most driving conditions. When you first start the vehicle and begin to drive away, the system performs several diagnostic checks to ensure there are no problems. The system may be heard or felt while it is working. This is normal and does not mean there is a problem with the vehicle. The system should initialize before the vehicle reaches 32 km/h (20 mph). In some cases, it may take approximately 3.2 km (2 mi) of driving before the system initializes. If the system fails to turn on or activate, one of the following messages will be displayed on the Driver Information Center (DIC): SERVICE TRACTION CONTROL,

SERVICE STABILITRAK, the StabiliTrak light will come on and stay and four chimes are heard. If these conditions are observed, turn the vehicle off, wait 15 seconds, and then turn it back on again to reset the system. If any of these messages still appear on the Driver Information Center (DIC), the vehicle should be taken in for service. For more information on the DIC messages, see Ride Control System Messages on page 5‑40.

The StabiliTrak light will flash on the instrument panel cluster when the system is both on and activated. The system may be heard or felt while it is working; this is normal.

The traction control button is located on the instrument panel. The traction control part of StabiliTrak can be turned off by pressing and releasing the traction control button. Traction control can be turned on by pressing and releasing the traction control button and the appropriate TRACTION CONTROL ON message will be displayed, if not automatically shut off for any other reason. When the traction control system is turned off, the appropriate TRACTION CONTROL OFF message will be displayed on the DIC. The vehicle will still have brake-traction control when traction control is off, but will not be able to use the engine speed management

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (29,1)

system. See “Traction Control Operation” following for more information. When the traction control system has been turned off, system noises may be heard and felt as a result of the brake-traction control working. It is recommended to leave the system on for normal driving conditions, but it may be necessary to turn the system off if the vehicle is stuck in sand, mud, ice, or snow, and you want to “rock” the vehicle to attempt to free it. It may also be necessary to turn off the system when driving in extreme off-road conditions where high wheel spin is required. See If the Vehicle Is Stuck on page 9‑9. Traction Control Operation The traction control system is part of the StabiliTrak system. Traction control limits wheel spin by reducing engine power to the wheels (engine speed management) and by applying the brakes as necessary.

Driving and Operating

9-29

The traction control system is enabled automatically when the vehicle is started. It will activate and the StabiliTrak light will flash if it senses that any of the wheels are spinning or beginning to lose traction while driving. If traction control is turned off, only the brake-traction control portion of traction control will work. The engine speed management will be disabled. In this mode, engine power is not reduced automatically and the driven wheels can spin more freely. This can cause the brake-traction control to activate constantly. Notice: If the wheel(s) of one axle is allowed to spin excessively while the StabiliTrak®, ABS, brake warning lights, and any relevant DIC messages are displayed, the transfer case could be damaged. The repairs would not be covered by the vehicle warranty. Reduce engine power and do not spin the

wheel(s) excessively while these lights and messages are displayed. The traction control system may activate on dry or rough roads or under conditions such as heavy acceleration while turning or abrupt upshifts/downshifts of the transmission. When this happens, a reduction in acceleration may be noticed, or a noise or vibration may be heard. This is normal. If cruise control is being used when the system activates, the StabiliTrak light will flash and cruise control will automatically disengage. Cruise control may be reengaged when road conditions allow. See Cruise Control on page 9‑30. StabiliTrak may also turn off automatically if it determines that a problem exists with the system. If the problem does not clear itself after restarting the vehicle, see your dealer for service.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (30,1)

9-30

Driving and Operating

Cruise Control With cruise control, a speed of about 40 km/h (25 mph) or more can be maintained without keeping your foot on the accelerator. Cruise control does not work at speeds below about 40 km/h (25 mph). When the brakes are applied, the cruise control is disengaged. { WARNING

Cruise control can be dangerous where you cannot drive safely at a steady speed. So, do not use the cruise control on winding roads or in heavy traffic. Cruise control can be dangerous on slippery roads. On such roads, fast changes in tire traction can cause excessive wheel slip, and you could lose control. Do not use cruise control on slippery roads.

The cruise control buttons are located on left side of the steering wheel. T (On/Off): Press to turn cruise control on and off. The indicator comes on when cruise control is on. + RES (Resume/Accelerate): Press briefly to make the vehicle resume to a previously set speed, or press and hold to accelerate. SET– : Press to set the speed and activate cruise control or to make the vehicle decelerate.

[ (Cancel): Press to disengage cruise control without erasing the set speed from memory.

Setting Cruise Control If the cruise button is on when not in use, it could get bumped and go into cruise when not desired. Keep the cruise control switch off when cruise is not being used. The cruise control light on the instrument panel cluster comes on after the cruise control has been set to the desired speed. 1. Press the I button to turn the

cruise control system on.

2. Get up to the speed desired. 3. Press and release the

SET– button located on the steering wheel.

4. Take your foot off the

accelerator.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (31,1)

Resuming a Set Speed If the cruise control is set at a desired speed and then the brakes are applied, the cruise control is disengaged without erasing the set speed from memory. Once the vehicle speed is 40 km/h (25 mph) or greater, press the +RES button on the steering wheel. The vehicle returns to the previously set speed and stays there.

Increasing Speed While Using Cruise Control If the cruise control system is already activated: . Press and hold the +RES button

on the steering wheel until the desired speed is reached, then release it. To increase vehicle speed in small increments, press the +RES button briefly. Each time this is done, the vehicle goes about 1.6 km/h (1 mph) faster.

Reducing Speed While Using Cruise Control If the cruise control system is already activated: . Press and hold the SET– button

on the steering wheel until the lower speed desired is reached, then release it. To slow down in small amounts, press the SET– button briefly. Each time this is done, the vehicle goes about 1.6 km/h (1 mph) slower.

Passing Another Vehicle While Using Cruise Control Use the accelerator pedal to increase vehicle speed. When you take your foot off the pedal, the vehicle will slow down to the previously set cruise speed.

Using Cruise Control on Hills How well the cruise control will work on hills depends upon the vehicle speed, load, and the steepness of the hills. When going up steep hills,

Driving and Operating

9-31

you might have to step on the accelerator pedal to maintain the vehicle speed. When going downhill, you might have to brake or shift to a lower gear to keep the vehicle speed down. When the brakes are applied the cruise control is disengaged.

Ending Cruise Control There are three ways to end cruise control: . Step lightly on the brake pedal.

. Press the [ button.

To turn off the cruise control, press T on the steering wheel.

Erasing Speed Memory The cruise control set speed is erased from memory by pressing T or if the ignition is turned off.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (32,1)

9-32

Driving and Operating

Object Detection Systems

Ultrasonic Parking Assist If available, the Ultrasonic Rear Parking Assist (URPA) system assists the driver with parking and avoiding objects while in R (Reverse). URPA operates at speeds less than 8 km/h (5 mph). The sensors on the rear bumper are used to detect objects up to 2.5 m (8 ft) behind the vehicle, and at least 25 cm (10 in) off the ground.

{ WARNING

The URPA system does not detect pedestrians, bicyclists, animals, or any other objects located below the bumper or that are too close or too far from the vehicle. To prevent injury, death,

(Continued)

WARNING (Continued)

or vehicle damage, even with URPA, always check behind the vehicle and check all mirrors before backing.

How the System Works URPA comes on automatically when the shift lever is moved into R (Reverse). A single tone sounds to indicate the system is working. URPA operates only at speeds less than 8 km/h (5 mph). An obstacle is indicated by audible beeps. The interval between the beeps becomes shorter as the vehicle gets closer to the obstacle. When the distance is less than 30 cm (12 in) the beeping is a continuous tone for five seconds.

To be detected, objects must be at least 25 cm (10 in) off the ground and below liftgate level. Objects must also be within 2.5 m (8 ft) from the rear bumper. This distance may be less during warmer or humid weather. Turning the System On and Off The system can be disabled through the Driver Information Center (DIC). See “Park Assist” under Vehicle Personalization (With DIC Buttons) on page 5‑44 for more information. URPA defaults to the on setting each time the vehicle is started. When the System Does Not Seem to Work Properly The following messages may be displayed on the DIC: SERVICE PARK ASSIST: message occurs, take the vehicle to your dealer to repair the system.

If this

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (33,1)

Driving and Operating

9-33

PARK ASST BLOCKED SEE OWNERS MANUAL: This message can occur under the following conditions:

The ultrasonic sensors are not clean. Keep the vehicle's rear bumper free of mud, dirt, snow, ice, and slush. For cleaning instructions, see Exterior Care on page 10‑81. The park assist sensors are covered by frost or ice. Frost or ice can form around and behind the sensors and may not always be seen; this can occur after washing the vehicle in cold weather. The message may not clear until the frost or ice has melted.

. A trailer was attached to the

vehicle, or an object was hanging out of the liftgate during the last drive cycle. Once the object is removed, URPA will return to normal operation.

. A tow bar is attached to the

vehicle. The bumper is damaged. Take the vehicle to your dealer to repair the system.

. Other conditions, such as

vibrations from a jackhammer or the compression of air brakes on a very large truck, are affecting system performance.

Rear Vision Camera (RVC) The vehicle may have a rear vision camera system. Read this entire section before using it.

{ WARNING

The RVC system does not display pedestrians, bicyclists, animals, or any other object located outside the cameras field of view, below the bumper, or under the vehicle.

(Continued)

WARNING (Continued)

Do not back the vehicle using only the RVC screen or by using the screen during longer, higher speed backing maneuvers, or where there could be cross-traffic. Perceived distances may be different from actual distances. Failure to use proper care before backing may result in injury, death, or vehicle damage. Always check before backing by checking behind and around the vehicle.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (34,1)

9-34

Driving and Operating

Vehicles without Navigation System The rear vision camera system is designed to help the driver when backing up by displaying a view of the area behind the vehicle. When the key is in the ON/RUN position and the driver shifts the vehicle into R (Reverse), the video image automatically appears on the inside rear view mirror. Once the driver shifts out of R (Reverse), the video image automatically disappears from the inside rear view mirror.

Turning the Rear Vision Camera System Off or On To turn off the rear vision camera system, press and hold z, located on the inside rearview mirror, until the left indicator light turns off. The rear vision camera display is now disabled. To turn the rear vision camera system on again, press and hold z until the left indicator light illuminates. The rear vision camera

system display is now enabled and the display will appear in the mirror normally. Vehicles with Navigation System The rear vision camera system is designed to help the driver when backing up by displaying a view of the area behind the vehicle. When the driver shifts the vehicle into R (Reverse), the video image automatically appears on the navigation screen. Once the driver shifts out of R (Reverse), the navigation screen will go back to the last screen that had been displayed, after a delay.

Turning the Rear Vision Camera System On or Off To turn the rear vision camera system on or off: 1. Shift into P (Park).

2. Press the MENU button to enter the configure menu options, then press the MENU hard key to select Display or touch the Display screen button.

3. Select the Rear Camera Options screen button. The Rear Camera Options screen displays.

4. Select the Video screen button.

When the Video screen button is highlighted the RVC system is on.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (35,1)

Driving and Operating

9-35

The delay received after shifting out of R (Reverse) is approximately 10 seconds. The delay can be canceled by performing one of the following: . Pressing a hard key on the

navigation system.

. Shifting into P (Park). . Reach a vehicle speed of

5 mph (8 km/h).

There is a message on the rear vision camera screen that states “Check Surroundings for Safety.”

Adjusting the Brightness and Contrast of the Screen To adjust the brightness and contrast of the screen, press the MENU button while the rear vision camera image is on the display. Any adjustments made will only affect the rear vision camera screen. ] (Brightness): Touch the + (plus) or – (minus) screen buttons to increase or decrease the brightness of the screen.

_ (Contrast): Touch the + (plus) or – (minus) screen buttons to increase or decrease the contrast of the screen.

Symbols The navigation system may have a feature that lets the driver view symbols on the navigation screen while using the rear vision camera. The Ultrasonic Rear Park Assist (URPA) system must not be disabled to use the caution symbols. If URPA has been disabled and the symbols have been turned on, the Rear Parking Assist Symbols Unavailable error message may display. See Ultrasonic Parking Assist on page 9‑32. The symbols appear when an object has been detected by the URPA system. The symbol may cover the object when viewing the navigation screen.

To turn the symbols on or off: 1. Make sure that URPA has not

been disabled.

2. Shift into P (Park). 3. Press the MENU hard key to

enter the configure menu options, then press the MENU hard key repeatedly until Display is selected or touch the Display screen button.

4. Select the Rear Camera Options screen button. The Rear Camera Options screen will display. 5. Touch the Symbols screen

button. The screen button will be highlighted when on.

Rear Vision Camera Error Messages Service Rear Vision Camera System: This message can display when the system is not receiving information it requires from other vehicle systems. If any other problem occurs or if a problem persists, see your dealer.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (36,1)

9-36

Driving and Operating

Rear Vision Camera Location

The area displayed by the camera is limited and does not display objects that are close to either corner or under the bumper. The area displayed can vary depending on vehicle orientation or road conditions. The distance of the image that appears on the screen differs from the actual distance. The following illustration shows the field of view that the camera provides.

The camera is located above the license plate.

A. View displayed by the camera. B. Corner of the rear bumper.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (37,1)

Driving and Operating

9-37

When the System Does Not Seem To Work Properly The rear vision camera system might not work properly or display a clear image if:

The RVC is turned off. See “Turning the Rear Camera System On or Off” earlier in this section. It is dark. The sun or the beam of headlights is shining directly into the camera lens. Ice, snow, mud, or anything else builds up on the camera lens. Clean the lens, rinse it with water, and wipe it with a soft cloth.

The back of the vehicle is in an accident. The position and mounting angle of the camera can change or the camera can be affected. Be sure to have the camera and its position and mounting angle checked at your dealer. There are extreme temperature changes.

The rear vision camera system display in the rearview mirror may turn off or not appear as expected due to one of the following conditions. If this occurs the left indicator light on the mirror will flash. . A slow flash may indicate a

loss of video signal, or no video signal present during the reverse cycle.

. A fast flash may indicate that

the display has been on for the maximum allowable time during a reverse cycle, or the display has reached an Over Temperature limit. The fast flash conditions are used to protect the video device from high temperature conditions. Once conditions return to normal the device will reset and the green indicator will stop flashing.

During any of these fault conditions, the display will be blank and the indicator will continue to flash as long as the vehicle is in R (Reverse) or until the conditions return to normal. Pressing and holding z when the left indicator light is flashing will turn off the video display along with the left indicator light.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (38,1)

9-38

Driving and Operating

Gasoline Specifications (U.S. and Canada Only) At a minimum, gasoline should meet ASTM specification D 4814 in the United States or CAN/CGSB‐3.5 or 3.511 in Canada. Some gasolines contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT). We recommend against the use of gasolines containing MMT. See Fuel Additives on page 9‑39 for additional information.

Fuel Use of the recommended fuel is an important part of the proper maintenance of this vehicle. To help keep the engine clean and maintain optimum vehicle performance, we recommend the use of gasoline advertised as TOP TIER Detergent Gasoline. Look for the TOP TIER label on the fuel pump to ensure gasoline meets enhanced detergency standards developed by auto companies. A list of marketers providing TOP TIER Detergent Gasoline can be found at www.toptiergas.com.

Recommended Fuel Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (39,1)

Fuels in Foreign Countries Never use leaded gasoline or any other fuel not recommended in the previous text on fuel. Costly repairs caused by use of improper fuel would not be covered by the vehicle warranty. To check the fuel availability, ask an auto club, or contact a major oil company that does business in the country where you will be driving.

California Fuel Requirements If the vehicle is certified to meet California Emissions Standards, it is designed to operate on fuels that meet California specifications. See the underhood emission control label. If this fuel is not available in states adopting California Emissions Standards, the vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system performance might be affected. The malfunction indicator lamp could turn on and the vehicle might fail a smog‐check test. See Malfunction Indicator Lamp on page 5‑17. If this occurs, return to your authorized dealer for diagnosis. If it is determined that the condition is caused by the type of fuel used, repairs might not be covered by the vehicle warranty.

Driving and Operating

9-39

Fuel Additives To provide cleaner air, all gasolines in the United States are now required to contain additives that help prevent engine and fuel system deposits from forming, allowing the emission control system to work properly. In most cases, nothing should have to be added to the fuel. However, some gasolines contain only the minimum amount of additive required to meet U.S. Environmental Protection Agency regulations. To help keep fuel injectors and intake valves clean and avoid problems due to dirty injectors or valves, look for gasoline that is advertised as TOP TIER Detergent Gasoline. Look for the TOP TIER label on the fuel pump to ensure gasoline meets enhanced detergency standards developed by the auto companies. A list of marketers providing TOP TIER Detergent Gasoline can be found at www.toptiergas.com.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (40,1)

9-40

Driving and Operating

For customers who do not use TOP TIER Detergent Gasoline regularly, one bottle of GM Fuel System Treatment PLUS, added to the fuel tank at every engine oil change, can help clean deposits from fuel injectors and intake valves. GM Fuel System Treatment PLUS is the only gasoline additive recommended by General Motors. It is available at your dealer. Gasolines containing oxygenates, such as ethers and ethanol, and reformulated gasolines might be available in your area. We recommend that you use these gasolines, if they comply with the specifications described earlier. However, E85 (85% ethanol) and other fuels containing more than 15% ethanol must not be used in vehicles that were not designed for those fuels.

Notice: This vehicle was not designed for fuel that contains methanol. Do not use fuel containing methanol. It can corrode metal parts in the fuel system and also damage plastic and rubber parts. That damage would not be covered under the vehicle warranty. Some gasolines that are not reformulated for low emissions can contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask the attendant where you buy gasoline whether the fuel contains MMT. We recommend against the use of such gasolines. Fuels containing MMT can reduce spark plug life and affect emission control system performance. The malfunction indicator lamp might turn on. If this occurs, return to your dealer for service.

Filling the Tank

{ WARNING

Fuel vapor burns violently and a fuel fire can cause bad injuries. To help avoid injuries to you and others, read and follow all the instructions on the fuel pump island. Turn off the engine when refueling. Do not smoke near fuel or when refueling the vehicle. Do not use cellular phones. Keep sparks, flames, and smoking materials away from fuel. Do not leave the fuel pump unattended when refueling the vehicle. This is against the law in some places. Do not re-enter the vehicle while pumping fuel. Keep children away from the fuel pump; never let children pump fuel.

The tethered fuel cap is located behind a hinged fuel door on the driver side of the vehicle.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (41,1)

To open the fuel door, push the rearward center edge in and release and it will open.

To remove the fuel cap, turn it slowly counterclockwise. The fuel cap has a spring in it; if the cap is released too soon, it will spring back to the right. While refueling, hang the tethered fuel cap from the hook on the fuel door.

Driving and Operating

9-41

{ WARNING

Fuel can spray out on you if you open the fuel cap too quickly. If you spill fuel and then something ignites it, you could be badly burned. This spray can happen if the tank is nearly full, and is more likely in hot weather. Open the fuel cap slowly and wait for any hiss noise to stop. Then unscrew the cap all the way.

Be careful not to spill fuel. Do not top off or overfill the tank and wait a few seconds after you have finished pumping before removing the nozzle. Clean fuel from painted surfaces as soon as possible. See Exterior Care on page 10‑81. When replacing the fuel cap, turn it clockwise until it clicks. Make sure the cap is fully installed. The

diagnostic system can determine if the fuel cap has been left off or improperly installed. This would allow fuel to evaporate into the atmosphere. See Malfunction Indicator Lamp on page 5‑17.

{ WARNING If a fire starts while you are refueling, do not remove the nozzle. Shut off the flow of fuel by shutting off the pump or by notifying the station attendant. Leave the area immediately.

Notice: If a new fuel cap is needed, be sure to get the right type of cap from your dealer. The wrong type of fuel cap might not fit properly, might cause the malfunction indicator lamp to light, and could damage the fuel tank and emissions system. See Malfunction Indicator Lamp on page 5‑17.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (42,1)

9-42

Driving and Operating

Filling a Portable Fuel Container

{ WARNING

Never fill a portable fuel container while it is in the vehicle. Static electricity discharge from the container can ignite the fuel vapor. You can be badly burned and the vehicle damaged if this occurs. To help avoid injury to you and others:

. Dispense fuel only into

approved containers.

. Do not fill a container while it

is inside a vehicle, in a vehicle's trunk, pickup bed, or on any surface other than the ground.

(Continued)

WARNING (Continued)

Towing

. Bring the fill nozzle in contact

with the inside of the fill opening before operating the nozzle. Contact should be maintained until the filling is complete.

. Do not smoke while

pumping fuel.

. Do not use a cellular phone

while pumping fuel.

General Towing Information Only use towing equipment that has been designed for the vehicle. Contact your dealer or trailering dealer for assistance with preparing the vehicle for towing a trailer. See the following trailer towing information in this section:

For information on driving while towing a trailer, see “Driving Characteristics and Towing Tips.” For maximum vehicle and trailer weights, see “Trailer Towing.” For information on equipment to tow a trailer, see “Towing Equipment.”

For information on towing a disabled vehicle, see Towing the Vehicle on page 10‑77. For information on towing the vehicle behind another

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (43,1)

vehicle such as a motor home, see Recreational Vehicle Towing on page 10‑78.

Driving Characteristics and Towing Tips

{ WARNING

The driver can lose control when pulling a trailer if the correct equipment is not used or the vehicle is not driven properly. For example, if the trailer is too heavy, the brakes may not work well — or even at all. The driver and passengers could be seriously injured. The vehicle may also be damaged; the resulting repairs would not be covered by the vehicle warranty. Pull a trailer only if all the steps in this section have been followed. Ask your dealer for advice and information about towing a trailer with the vehicle.

Driving and Operating

9-43

The vehicle can tow a trailer when equipped with the proper trailer towing equipment. For trailering capacity, see Trailer Towing on page 9‑47. Trailering changes handling, acceleration, braking, durability and fuel economy. With the added weight, the engine, transmission, wheel assemblies and tires are forced to work harder and under greater loads. The trailer also adds wind resistance, increasing the pulling requirements. For safe trailering, correctly use the proper trailering equipment. The following information has important trailering tips and rules for your safety and that of your passengers. Read this section carefully before pulling a trailer. Pulling a Trailer Here are some important points:

There are many laws, including speed limit restrictions that apply to trailering. Check for legal requirements.

. Consider using sway control.

See Towing Equipment on page 9‑49.

. Do not tow a trailer at all during the first 800 km (500 miles) the new vehicle is driven. The engine, axle, or other parts could be damaged.

. During the first 800 km

(500 miles) that a trailer is towed, do not drive over 80 km/h (50 mph) and do not make starts at full throttle. This reduces wear on the vehicle. The vehicle can tow in D (Drive). Use a lower gear if the transmission shifts too often. See “Tow/Haul Mode” later in this section.

. Obey speed limit restrictions

when towing a trailer. The vehicle is designed primarily as a passenger and load carrying vehicle. If a trailer is towed, the vehicle will require more frequent maintenance due to the additional load.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (44,1)

9-44

Driving and Operating

Driving with a Trailer Towing a trailer requires experience. Get familiar with handling and braking with the added trailer weight. The vehicle is now longer and not as responsive as the vehicle is by itself. Check all trailer hitch parts and attachments, safety chains, electrical connectors, lamps, tires and mirror adjustments. If the trailer has electric brakes, start the vehicle and trailer moving and then apply the trailer brake controller by hand to be sure the brakes are working. During the trip, check regularly to be sure that the load is secure, and the lamps and trailer brakes are working properly.

Towing with a Stability Control System When towing, the sound of the stability control system might be heard. The system is reacting to the vehicle movement caused by the trailer, which mainly occurs during cornering. This is normal when towing heavier trailers. Tow/Haul Mode Tow/Haul assists when pulling a heavy trailer or a large or heavy load. The purpose of the Tow/Haul mode is to: . Reduce the frequency and improve the predictability of transmission shifts.

. Provide the same solid shift feel as when the vehicle is unloaded. Improve control of vehicle speed while requiring less throttle pedal activity.

Increase the charging system voltage to assist in recharging a battery installed in a trailer.

Press this button located on the console to turn on and turn off the Tow/Haul mode. See Tow/Haul Mode on page 9‑24. The Tow/Haul light on the instrument panel comes on to indicate that Tow/Haul mode has been selected. Tow/Haul may be turned off by pressing the button again, at which time the indicator light on the instrument panel will turn off. The vehicle will automatically turn off Tow/Haul every time it is started.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (45,1)

Driving and Operating

9-45

Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle's Gross Combined Weight Rating (GCWR). See Trailer Towing on page 9‑47. Tow/Haul is most useful when pulling a heavy trailer or a large or heavy load under the following driving conditions:

Traveling through rolling terrain. Traveling in stop and go traffic. Traveling in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul when lightly loaded or with no trailer will not cause damage but there is no benefit. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy.

Following Distance Stay at least twice as far behind the vehicle ahead as you would when driving the vehicle without a trailer. This can help to avoid situations that require heavy braking and sudden turns. Passing More passing distance is needed when towing a trailer. Because the rig is longer, it is necessary to go farther beyond the passed vehicle before returning to the lane. Backing Up Hold the bottom of the steering wheel with one hand. To move the trailer to the left, move that hand to the left. To move the trailer to the right, move your hand to the right. Always back up slowly and, if possible, have someone guide you.

Making Turns Notice: Making very sharp turns while trailering could cause the trailer to come in contact with the vehicle. The vehicle could be damaged. Avoid making very sharp turns while trailering. When turning with a trailer, make wider turns than normal so the trailer will not strike soft shoulders, curbs, road signs, trees or other objects. Use the turn signal well in advance and avoid jerky or sudden maneuvers. Turn Signals When Towing a Trailer The turn signal indicators on the instrument panel flash whenever signaling a turn or lane change. Properly hooked up, the trailer lamps also flash, telling other drivers the vehicle is turning, changing lanes or stopping.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (46,1)

9-46

Driving and Operating

When towing a trailer, the arrows on the instrument panel flash for turns even if the bulbs on the trailer are burned out. Check occasionally to be sure the trailer bulbs are still working. Driving on Grades Reduce speed and shift to a lower gear before starting down a long or steep downgrade. If the transmission is not shifted down, the brakes might have to be used so much that they would get hot and no longer work well. See “Automatic Engine Grade Braking” within Tow/Haul Mode on page 9‑24. The vehicle can tow in D (Drive). Use a lower gear if the transmission shifts too often.

When towing at high altitude on steep uphill grades, engine coolant will boil at a lower temperature than at normal altitudes. If the engine is turned off immediately after towing at high altitude on steep uphill grades, the vehicle may show signs similar to engine overheating. To avoid this, let the engine run while parked, preferably on level ground, with the transmission in P (Park) for a few minutes before turning the engine off. If the overheat warning comes on, see Engine Overheating on page 10‑18. On a long uphill grade, shift down and reduce the vehicle speed to around 88 km/h (55 mph) to reduce the possibility of the engine and the transmission overheating.

Parking on Hills

{ WARNING

Parking the vehicle on a hill with the trailer attached can be dangerous. If something goes wrong, the rig could start to move. People can be injured, and both the vehicle and the trailer can be damaged. When possible, always park the rig on a flat surface.

If parking the rig on a hill: 1. Press the brake pedal, but do not shift into P (Park) yet. Turn the wheels into the curb if facing downhill or into traffic if facing uphill.

2. Have someone place chocks

under the trailer wheels.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (47,1)

3. When the wheel chocks are in place, release the brake pedal until the chocks absorb the load.

4. Reapply the brake pedal. Then

apply the parking brake and shift into P (Park).

5. Release the brake pedal. Leaving After Parking on a Hill 1. Apply and hold the brake pedal

while you: 1.1. Start the engine. 1.2. Shift into a gear. 1.3. Release the parking brake.

2. Let up on the brake pedal. 3. Drive slowly until the trailer is

clear of the chocks.

4. Stop and have someone pick up

and store the chocks.

Maintenance When Trailer Towing The vehicle needs service more often when pulling a trailer. See Maintenance Schedule on page 11‑2. Things that are especially important in trailer operation are automatic transmission fluid, engine oil, axle lubricant, belts, cooling system and brake system. Inspect these before and during the trip. Check periodically to see that all hitch nuts and bolts are tight. Engine Cooling When Trailer Towing The cooling system may temporarily overheat during severe operating conditions. See Engine Overheating on page 10‑18.

Driving and Operating

9-47

Trailer Towing Three important considerations have to do with weight:

The weight of the trailer The weight of the trailer tongue The total weight on the vehicle's tires

Weight of the Trailer How heavy can a trailer safely be? Speed, altitude, road grades, outside temperature, special equipment, and the amount of tongue weight the vehicle can carry must be considered. See “Weight of the Trailer Tongue” later in this section for more information. Maximum trailer weight is calculated assuming only the driver is in the tow vehicle and it has all the required trailering equipment. The weight of additional optional equipment, passengers and cargo in the tow vehicle must be subtracted from the maximum trailer weight.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (48,1)

9-48

Driving and Operating

Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options.

Vehicle

Maximum Trailer Weight

*GCWR

Front‐Wheel Drive Front‐Wheel Drive, V92 Trailer Towing Package All‐Wheel Drive All‐Wheel Drive, V92 Trailer Towing Package *The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment and conversions. The GCWR for the vehicle should not be exceeded.

7,500 lbs (3 402 kg) 10,250 lbs (4 649 kg) 7,700 lbs (3 493 kg) 10,450 lbs (4 740 kg)

2,000 lbs (907 kg) 5,200 lbs (2 359 kg) 2,000 lbs (907 kg) 5,200 lbs (2 359 kg)

Ask your dealer for our trailering information or advice. See Customer Assistance Offices (U.S. and Canada) on page 13‑4 or Customer Assistance Offices (Mexico) on page 13‑5 for more information.

Weight of the Trailer Tongue The tongue load (A) of any trailer is an important weight to measure because it affects the total gross weight of the vehicle. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo carried in it, and the people who will be riding in the vehicle.

If there are a lot of options, equipment, passengers or cargo in the vehicle, it will reduce the tongue weight the vehicle can carry, which will also reduce the trailer weight the vehicle can tow. If towing a trailer, the tongue load must be added to the GVW because the vehicle will be carrying that weight, too. See Vehicle Load Limits on page 9‑10.

GMC Acadia/Acadia Denali Owner Manual - 2012

Black plate (49,1)

Driving and Operating

9-49

(Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Axle Weight Rating). The effect of additional weight may reduce the trailering capacity more than the total of the additional weight. It is important that the vehicle does not exceed any of its ratings — GCWR, GVWR, RGAWR,