2014 Chevrolet Express Owners Manual

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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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 on page 9-20
and Engine Exhaust on page 9-22. If parking on a hill and pulling a trailer, see Driving Characteristics and Towing Tips on page 9-48.

Automatic Transmission

Automatic Transmission (Six Speed) Vehicles with a 6-speed automatic transmission have a shift position indicator within the instrument cluster. There are several different positions for the shift lever.

See “Range Selection Mode” under Manual Mode on page 9-29. P (Park): 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,

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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 on page 9-20.

{ 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 on page 9-20 and Driving Characteristics and Towing Tips on page 9-48.

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Driving and Operating

R (Reverse): 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 on page 9-9. N (Neutral): 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.

{ 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 (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 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.

D (Drive) can be used when towing a trailer, carrying a heavy load, or driving on steep hills. You might want to 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 on page 9-5. The vehicle has a shift stabilization feature that adjusts the transmission shifting to the current driving

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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. The transmission uses adaptive shift controls. Adaptive shift controls continually compare 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

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adaptive shift control process, shifting might feel different as the transmission determines the best settings. The shift quality of a new vehicle may not be ideal because the adaptive shift control process may not have determined the best settings for a particular shift or condition. Shift quality will improve with continued driving. 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 (Manual Mode): This position lets drivers select the range of gears appropriate for current driving conditions. If the vehicle has this feature, see “Range Selection Mode” under Manual Mode on page 9-29.

3 (Third): This position is also used for normal driving. It reduces vehicle speed more than D (Drive) without using the brakes. You might choose 3 (Third) instead of D (Drive) when driving on hilly, winding roads; when towing a trailer, so there is less shifting between gears; and when going down a steep hill. See “Range Selection Mode” under Manual Mode on page 9-29. 2 (Second): This position reduces vehicle speed even more than 3 (Third) without using the brakes. You can use 2 (Second) on hills. It can help control vehicle speed as you go down steep mountain roads, but then you would also want to use the brakes off and on. See “Range Selection Mode” under Manual Mode on page 9-29. If you manually select 2 (Second) in an automatic transmission, the transmission will start in second gear. You can use this feature for reducing the speed of the

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Driving and Operating

rear wheels when trying to start the vehicle from a stop on slippery road surfaces. 1 (First): This position reduces vehicle speed without using the brakes. You can use it for major/ severe downgrades where the vehicle would otherwise accelerate due to steepness of grade. When you shift to 1 (First) it provides the lowest gear appropriate to current road speed and continues to downshift as the vehicle slows, eventually downshifting to 1 (First) gear. The transmission can be held in 1 (First) gear using Range Selection Mode or the shift lever. See “Range Selection Mode” under Manual Mode on page 9-29.

{ Caution

Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transmission.

(Continued)

Caution (Continued)

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 Vehicles with a 6-speed automatic transmission have Normal Mode Grade Braking that 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 activates for each ignition key cycle, a DIC message will be displayed. See Transmission Messages on page 5-38. To disable or enable Normal Mode Grade Braking within the current ignition key cycle, press and hold

the Tow/Haul button for three seconds. A DIC message displays. See Transmission Messages on page 5-38. For other forms of grade braking, see Tow/Haul Mode on page 9-30
and Cruise Control on page 9-35.

Automatic Transmission (Four Speed)

There are several different positions for the shift lever. P (Park): This position locks the rear wheels. It is the best position to use when you start the engine because the vehicle cannot move easily.

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brake pedal before you can shift from P (Park) with the ignition in ON/RUN. If you cannot shift out of P (Park), ease pressure on the shift lever and push the shift lever all the way into P (Park) as you maintain brake application. Then move the shift lever into another gear. See Shifting out of Park on page 9-21. R (Reverse): 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 on page 9-9. 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.

{ 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 on page 9-20 and Driving Characteristics and Towing Tips on page 9-48.

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 first press the

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Driving and Operating

{ 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 (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 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. You will shift down to the next gear and have more power.

Downshifting the transmission in slippery road conditions could result in skidding. See “Skidding” under Loss of Control on page 9-5. 3 (Third): This position is also used for normal driving. However it reduces vehicle speed more than D (Drive) without using the brakes. You might choose 3 (Third) instead of D (Drive) when driving on hilly, winding roads; when towing a trailer, so there is less shifting between gears; and when going down a steep hill. You should use 3 (Third) (or a lower gear as needed) when towing a trailer to minimize heat build-up and extend the life of the transmission. 2 (Second): This position reduces vehicle speed even more than 3 (Third) without using the brakes. You can use 2 (Second) on hills. It can help control vehicle speed as you go down steep mountain roads, but then you would also want to use the brakes off and on.

You may use this feature for reducing torque to the rear wheels when trying to start the vehicle from a stop on slippery road surfaces. 1 (First): This position reduces vehicle speed even more than 2 (Second) without using the brakes. You can use it on very steep hills, or in deep snow or mud. If the shift lever is put in 1 (First) while the vehicle is moving forward, the transmission will not shift into first gear until the vehicle is going slowly enough.

{ 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.

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Driving and Operating

9-29

Caution (Continued)

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.

Low Traction Mode Low Traction Mode can assist in vehicle acceleration when road conditions are slippery. While the vehicle is at a stop, select the second gear range using Range Selection Mode. This will limit torque to the wheels after it detects wheel slip, preventing the tires from spinning.

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. To use this feature: 1. Move the shift lever to

M (Manual Mode).

2. Press the +/− buttons on the

shift lever, to select the desired range of gears for current driving conditions.

When M (Manual Mode) is selected a number displays in the DIC next to the M indicating the current gear.

This number is the highest gear that can be used. However, the vehicle can automatically shift to lower gears as it adjusts to driving conditions. This means that all gears below that number are available. When 5 (Fifth) is selected, 1 (First) through 5 (Fifth) gears are automatically shifted by the vehicle, but 6 (Sixth) cannot be used until the +/− button on the steering column lever is used to change to the gear. Grade Braking is not available when Range Selection Mode is active. See Tow/Haul Mode on page 9-30. While using Range Selection Mode, cruise control and the Tow/Haul Mode can be used.

{ Caution

Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transmission.

(Continued)

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Driving and Operating

Tow/Haul Mode

If equipped, Tow/Haul Mode adjusts the transmission shift pattern to reduce shift cycling, providing increased performance, vehicle control, and transmission cooling when towing or hauling heavy loads.

To disable or enable Tow/Haul Mode Grade Braking within the current ignition key cycle, press and hold the Tow/Haul button for three seconds. A DIC message will be displayed. See Transmission Messages on page 5-38. See Towing Equipment on page 9-56. For other forms of grade braking, see Automatic Transmission (Six Speed) on page 9-23 or Automatic Transmission (Four Speed) on page 9-26 and Cruise Control on page 9-35.

Turn the Tow/Haul Mode on and off by pressing the button on the instrument panel. When Tow/Haul is on, a light on the instrument cluster will come on. See Tow/Haul Mode Light on page 5-22. Also see “Tow/Haul Mode” under Towing Equipment on page 9-56. Tow/Haul Mode Grade Braking (6-Speed Automatic Transmission) Tow/Haul Mode Grade Braking is only enabled while the Tow/Haul Mode is selected and the vehicle is not in the Range Selection Mode. See “Tow/Haul Mode” listed previously and Manual Mode on page 9-29. Tow/Haul Mode Grade Braking assists in maintaining desired vehicle speeds when driving on downhill grades by using the engine and transmission to slow the vehicle.

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Drive Systems

Brakes

All-Wheel Drive If the vehicle has this feature, engine power is sent to all four wheels when extra traction is needed. This is like four-wheel drive, but there is no separate lever or switch to engage or disengage the front axle. It is fully automatic, and adjusts itself as needed for road conditions.

Antilock Brake System (ABS) This vehicle has ABS, an advanced electronic braking system that helps prevent a braking skid. When 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.

If there is a problem with ABS, this warning light stays on. See Antilock Brake System (ABS) Warning Light on page 5-22.

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 you 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

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Driving and Operating

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 you to steer and brake at the same time. In many emergencies, steering can help more than even the very best braking.

If the ignition is on when the parking brake is released, the brake system warning light will go off. { Caution

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.

If you are towing a trailer and are parking on a hill, see Driving Characteristics and Towing Tips on page 9-48.

Parking Brake

To set the parking brake, hold the regular brake pedal, then push down the parking brake pedal. If the ignition is on, the brake system warning light will come on. To release the parking brake, hold the regular brake pedal down. Pull the handle, located just above the parking brake pedal, with the parking brake symbol, to release the parking brake.

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Ride Control Systems

Traction Control/ Electronic Stability Control The vehicle may have a vehicle stability enhancement system called StabiliTrak. It is an advanced computer controlled system that assists the driver with directional control of the vehicle in difficult driving conditions. StabiliTrak activates when the computer senses a discrepancy between the intended path and the direction the vehicle is actually traveling. StabiliTrak selectively applies braking pressure at any one of the vehicle's brakes to assist the driver with keeping the vehicle on the intended path. When the vehicle is started and begins to move, the system performs several diagnostic checks to ensure there are no problems. The system may be heard or felt

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For your safety, the system can only be disabled when the vehicle speed is less than 40 km/h (25 mph).

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 40 km/h (25 mph). In some cases, it may take approximately 3.2 km (2 mi) of driving before the system initializes.

The Traction Control System (TCS)/ StabiliTrak indicator light comes on in the instrument cluster when the system requires service. When StabiliTrak activates, the TCS/StabiliTrak indicator light flashes in the instrument cluster. This also occurs when TCS is activated. See Traction Control System (TCS)/ StabiliTrak® Light on page 5-23.

Press the StabiliTrak button on the instrument panel once to turn off the TCS. The appropriate message is displayed in the DIC. See Ride Control System Messages on page 5-35.

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Driving and Operating

and you want to “rock” the vehicle to attempt to free it. See If the Vehicle Is Stuck on page 9-9. StabiliTrak System Operation The StabiliTrak system is normally on, except when the system is initializing or has been disabled with the StabiliTrak button. The StabiliTrak system will automatically activate to assist the driver in maintaining vehicle directional control in most driving conditions. When activated, the StabiliTrak system may reduce engine power to the wheels and apply braking to individual wheels as necessary to assist the driver with vehicle directional control. If cruise control is being used when StabiliTrak activates, the cruise control automatically disengages. The cruise control can be re-engaged when road conditions allow. See Cruise Control on page 9-35. The StabiliTrak system 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. Traction Control Operation TCS is part of the StabiliTrak system. TCS limits wheel spin by reducing engine power to the wheels and by applying brakes to each individual wheel as necessary. If the brake-traction control system activates constantly or if the brakes have heated up due to high speed braking, the brake-traction control will be automatically disabled. The system will come back on after the brakes have cooled. This can take up to two minutes or longer depending on brake usage. TCS 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 reduction in acceleration occurs, it may be noticed, or a noise or vibration may be heard. This is normal.

Press and hold the StabiliTrak button to turn off StabiliTrak and TCS. The StabiliTrak OFF light illuminates and the appropriate messages will be displayed in the DIC. See Ride Control System Messages on page 5-35. To turn StabiliTrak and TCS back on, press the StabiliTrak button again. StabiliTrak will automatically turn back on when the vehicle speed exceeds 40 km/h (25 mph). When the StabiliTrak system has been turned off, system noises may still be heard as a result of the brake-traction control coming on. 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,

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Driving and Operating

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Adding non-dealer accessories can affect the vehicle's performance. See Accessories and Modifications on page 10-3.

Locking Rear Axle Vehicles with a locking rear axle can give more traction on snow, mud, ice, sand, or gravel. It works like a standard axle most of the time, but when traction is low, this feature will allow the rear wheel with the most traction to move the vehicle.

Cruise Control { Warning

Cruise control can be dangerous where you cannot drive safely at a steady speed. 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.

If equipped 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, cruise control is turned off.

If the vehicle has StabiliTrak and the system begins to limit wheel spin, cruise control will automatically disengage. See Traction Control/ Electronic Stability Control on page 9-33. When road conditions allow the cruise control to be safely used again, it can be turned back on.

I (On/Off): Press to turn the system on or off. The indicator light on the button turns on when cruise control is turned on and goes off when cruise is turned off.

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Driving and Operating

+RES (Resume/Accelerate): Press briefly to make the vehicle resume to a previously set speed, or press and hold to accelerate. If cruise control is already active, use to increase vehicle speed. SET− (Set/Coast): Press briefly to set the speed and activate cruise control, or press and hold to decelerate. If cruise control is already active, use to decrease vehicle speed. [ (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 cluster comes on after the cruise control has been set to the desired speed. 1. Press the I button. 2. Get up to the desired speed. 3. Press the SET− button on the steering wheel and release it.

4. Remove foot from the

accelerator.

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 reaches about 40 km/h (25 mph) or more, briefly press the +RES button on the steering wheel. The vehicle returns to the previous set speed.

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, briefly press the +RES button. 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 desired lower speed is reached, then release it. To slow down in small increments, briefly press the SET– button on the steering

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When the brakes are manually applied the cruise control is disengaged.

Ending Cruise Control There are three ways to end cruise control:

To disengage cruise control, step lightly on the brake pedal.

. Press the [ on the steering

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

Erasing Speed Memory The cruise control set speed is erased from memory if I is pressed or if the vehicle is turned off.

wheel 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 the vehicle speed. When you take your foot off the pedal, the vehicle will slow down to the previous set cruise speed. While pressing the accelerator pedal or shortly following the release to override cruise control, briefly applying the SET– button will result in cruise control set to the current vehicle speed.

Using Cruise Control on Hills How well the cruise control works on hills depends on the vehicle speed, the load, and the steepness of the hills. When going up steep hills, pushing the accelerator pedal may be necessary to maintain vehicle speed.

While going downhill: . Vehicles with a 4-speed

automatic transmission may need to have the brakes applied or the transmission shifted to a lower gear to help maintain driver selected speed.

. Vehicles with a 6-speed

automatic transmission have Cruise Grade Braking to help maintain driver selected speed.

Cruise Grade Braking is enabled when the vehicle is started and Cruise Control is active. It is not enabled in Range Selection Mode. It assists in maintaining driver selected speed when driving on downhill grades by using the engine and transmission to slow the vehicle. To disable and enable Cruise Grade Braking for the current ignition key cycle, press and hold the Tow/Haul button for three seconds. A DIC message displays. See Transmission Messages on page 5-38.

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Driving and Operating

Driver Assistance Systems

Ultrasonic Parking Assist If available, the Ultrasonic Rear Parking Assist (URPA) system uses sensors on the rear bumper to assist with parking and avoiding objects while in R (Reverse).

{ Warning

The URPA system does not detect children, pedestrians, bicyclists, animals, or objects below the bumper or that are too close or too far from the vehicle. It is not available at speeds greater than 8 km/h (5 mph). To prevent injury, death, or vehicle damage, even with URPA, always check the area around 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 beep sounds to indicate the system is working. URPA operates only at speeds less than 8 km/h (5 mph). An obstacle detection is indicated by beeps. The time between beeps gets shorter as the vehicle approaches the obstacle. Repeated beeps are heard when the distance is less than 30 cm (12 in). To be detected, objects must be at least 25 cm (10 in) off the ground and below rear door 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 Driver Information Center (DIC) on page 5-25. URPA defaults to the on setting each time the vehicle is started. Turn URPA off when towing a trailer. 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 for repair. PARK ASSIST OFF: This message occurs if the driver disables the system or if the vehicle is driven above 8 km/h (5 mph) in R (Reverse).

If this

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

The ultrasonic sensors are not clean. Keep the rear bumper free of mud, dirt, snow, ice, slush, and frost. The message may not clear until frost or ice has melted all around and inside the sensor.

. A trailer is attached to the

vehicle, or a bicycle or an object hanging out of the rear door during the current or last drive cycle. URPA will return to normal operation after it is determined the object is removed. This could take a few drive cycles.

. A tow bar is attached to the

vehicle.

Other conditions may affect system performance, such as vibrations from a jackhammer or the compression of air brakes on a very large truck.

Rear Vision Camera (RVC) If available, the Rear Vision Camera (RVC) system is designed to help the driver when backing up by displaying a view of the area behind the vehicle.

{ Warning

The RVC system does not display children, pedestrians, bicyclists, animals, or any other object located outside the camera's field of view, below the bumper, or under the vehicle. Perceived distances may be different from actual distances. Do not back the vehicle using only the RVC screen, during longer, higher speed backing maneuvers, or where there could be cross traffic. Failure to use proper care before backing may result in

(Continued)

Warning (Continued)

injury, death, or vehicle damage. Always check behind and around the vehicle before backing.

Vehicles without Navigation System When the vehicle is on and shifted into R (Reverse), the video image appears on the inside rearview mirror. The video image disappears after the vehicle is shifted out of R (Reverse). Vehicles with Navigation System When the vehicle is shifted into R (Reverse), the video image appears on the navigation screen. After a delay, the navigation screen displays the previous screen after the vehicle is shifted out of R (Reverse).

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Driving and Operating

Turning the RVC System On or Off The navigation system may allow the RVC to be turned on or off. To turn the RVC system on or off: 1. Shift into P (Park). 2. Press MENU to enter the

configure menu options. Turn the Multifunction knob until the Display feature is highlighted and press the Multifunction knob; or press 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.

The delay that is received after shifting out of R (Reverse) is approximately 10 seconds. Return to the previous screen sooner by performing one of the following: . Press a hard key on the

navigation system.

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

8 km/h (5 mph).

Symbols and Guidelines The navigation system may have a feature that allows for viewing parking assist symbols and/or guidelines on the navigation screen while using the RVC. 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 9-38. The symbols appear near objects detected by the URPA system. The symbol may cover the object when viewing the navigation screen. The guideline overlay can help the driver align the vehicle when backing into a parking spot.

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

been disabled.

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

configure menu options. Turn the Multifunction knob until the Display feature is highlighted and press the Multifunction knob; or press the Display screen button.

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

5. Touch the Symbols or

Guidelines screen button. The screen button will be highlighted when the feature is on.

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RVC Location

1. View displayed by the camera

The camera is above the license plate. This shows the field of view that the camera provides.

1. View displayed by the camera 2. Corners of the rear bumper

Driving and Operating

9-41

Displayed images may be further or closer than they appear. The area displayed is limited and objects that are close to either corner of the bumper or under the bumper do not display. When the System Does Not Seem To Work Properly The RVC system might not work properly or display a clear image if:

The RVC is turned off. See “Turning the RVC System On or Off” earlier in this section. It is dark. The sun or the beam of headlamps 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.

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Driving and Operating

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 indicator will stop flashing.

During any of these fault conditions, the display will be blank and the indicator will flash while the vehicle is in R (Reverse) or until the conditions return to normal.

Fuel For diesel engine vehicles, see “Fuel for Diesel Engines” in the Duramax diesel supplement. For gasoline engine vehicles, use of the recommended fuel is an important part of the proper maintenance of this vehicle. When driving in the U.S., to help keep the engine clean and maintain optimum vehicle performance, we recommend using TOP TIER Detergent Gasolines. See www.toptiergas.com for a list of TOP TIER Detergent Gasolines.

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.

The RVC 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.

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Driving and Operating

9-43

knocking is heard when using gasoline with a higher octane rating, the engine needs service.

Use of Seasonal Fuels Use summer and winter fuels in the appropriate season. Driving or starting could be affected if the incorrect fuel is used. Drive the vehicle with the engine running until the fuel is a half tank or less, then refuel with the current seasonal fuel.

Prohibited Fuels Gasolines containing oxygenates, such as ethers and ethanol, as well as reformulated gasolines are available in some cities. If these gasolines comply with the previously described specification, then they are acceptable to use. However, E85 and other fuels containing more than 15% ethanol must be used only in FlexFuel vehicles.

{ Caution

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). Do not use gasolines with MMT as they can reduce spark plug life and affect emission control system performance. The malfunction indicator lamp may turn on. If this occurs, see your dealer for service.

If the vehicle has a yellow fuel cap, E85 or flex fuel can be used in the vehicle. See E85 or FlexFuel on page 9-44.

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 may be heard. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy

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Driving and Operating

Gasoline Specifications At a minimum, gasoline should meet ASTM specification D 4814. Some gasolines contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT). We recommend against the use of gasolines containing MMT. See “Prohibited Fuels" in Recommended Fuel on page 9-43.

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 may not pass a smog-check test. See Malfunction Indicator Lamp on page 5-19. 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 may not be covered by the vehicle warranty.

Fuels in Foreign Countries If planning to drive in countries outside the U.S. or Canada, the proper fuel might be hard to find. Check regional auto club or fuel retail brand websites for availability in the country where driving. Never use leaded gasoline, fuel containing methanol, or any other fuel not recommended. Costly repairs caused by use of improper fuel would not be covered by the vehicle warranty.

Fuel Additives To keep fuel systems clean, TOP TIER Detergent Gasoline is recommended. See Fuel on page 9-42. If TOP TIER Detergent Gasoline is not available, one bottle of Fuel System Treatment PLUS, part number 88861013, added to the fuel tank at every engine oil change, can help. Fuel System Treatment PLUS is the only gasoline additive recommended by General Motors. It is available at your dealer. Do not use additives with E85 or FlexFuel.

E85 or FlexFuel Vehicles with a yellow fuel cap can use either unleaded gasoline or fuel containing up to 85% ethanol (E85). All other vehicles should use only the unleaded gasoline as described in Fuel on page 9-42.

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Driving and Operating

9-45

The use of E85 or FlexFuel is encouraged when the vehicle is designed to use it. E85 or FlexFuel is made from renewable sources. To help locate fuel stations that carry E85 or FlexFuel, the U.S. Department of Energy has an alternative fuels website. See www.afdc.energy.gov/afdc/locator/ stations. E85 or FlexFuel should meet ASTM Specification D 5798 or CAN/ CGSB–3.512 in Canada. Do not use the fuel if the ethanol content is greater than 85%. Fuel mixtures that do not meet ASTM or CGSB specifications can affect driveability and could cause the malfunction indicator lamp to come on. After refueling, the vehicle calculates the composition of the fuel. It is not recommended to repeatedly switch between fuels. If fuels are switched frequently, add as much fuel as possible and do not add less than 11 L (3 gal) when refueling. Drive at least 11 km (7 mi)

immediately after refueling to allow the vehicle to adapt to the change in ethanol concentration. Because E85 or FlexFuel has less energy per liter (gallon) than gasoline, the vehicle will need to be refilled more often. See Filling the Tank on page 9-45.

{ Caution Some additives are not compatible with E85 or FlexFuel and can harm the vehicle's fuel system. Do not add anything to E85 or FlexFuel. Damage caused by additives would not be covered by the vehicle warranty.

{ Caution

Do not use fuel containing methanol. It can corrode metal parts in the fuel system and also

(Continued)

Caution (Continued)

damage plastic and rubber parts. That damage would not be covered under the vehicle warranty.

Filling the Tank

{ Warning

Fuel vapors and fuel fires burn violently and can cause injury or death.

. 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.

. Keep sparks, flames, and

smoking materials away from fuel.

(Continued)

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Driving and Operating

Warning (Continued)

. Do not leave the fuel pump

unattended.

. Do not reenter the vehicle

while pumping fuel.

. Keep children away from the

fuel pump and never let children pump fuel.

. Fuel can spray out if the fuel

cap is opened too quickly. 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 10-86. 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 5-19.

{ 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.

The fuel cap is behind a hinged fuel door on the driver side of the vehicle. If the vehicle has E85 fuel capability, the fuel cap will be yellow and state that E85 or gasoline can be used. See E85 or FlexFuel on page 9-44. To remove the fuel cap, turn it slowly counterclockwise. While refueling, hang the tethered fuel cap from the hook on the fuel door.

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{ Caution

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 5-19.

Driving and Operating

9-47

Warning (Continued)

keep it in contact with the fill opening until filling is complete.

. Fill the container no more than 95% full to allow for expansion.

. Do not smoke, light matches,

or use lighters while pumping fuel.

. Avoid using cell phones or

other electronic devices.

Filling a Portable Fuel Container

{ Warning

Filling a portable fuel container while it is in the vehicle can cause fuel vapors that can ignite either by static electricity or other means. You or others could be badly burned and the vehicle could be damaged. Always:

. Use approved fuel

containers.

. Remove the container from the vehicle, trunk, or pickup bed before filling.

. Place the container on the

ground.

. Place the nozzle inside the fill

opening of the container before dispensing fuel, and

(Continued)

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Driving and Operating

Trailer Towing

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. Read the entire section before towing a trailer. For towing a disabled vehicle, see Towing the Vehicle on page 10-83. For towing the vehicle behind another vehicle such as a motor home, see Recreational Vehicle Towing on page 10-83.

Driving Characteristics and Towing Tips

Driving with a Trailer When towing a trailer: . Become familiar with the state

and local laws that apply to trailer towing.

. Do not tow a trailer during the first 800 km (500 mi) to prevent damage to the engine, axle, or other parts. Then during the first 800 km (500 mi) of trailer towing, do not drive over 80 km/h (50 mph) and do not make starts at full throttle.

. Vehicles can tow in D (Drive).

Shift the transmission to a lower gear if the transmission shifts too often under heavy loads and/ or hilly conditions. Turn off Park Assist when towing.

{ Warning

When towing a trailer, exhaust gases may collect at the rear of the vehicle and enter if the liftgate, trunk/hatch, or rear-most window is open. When towing a trailer:

. Do not drive with the liftgate,

trunk/hatch, or rear-most window open.

. Fully open the air outlets on

or under the instrument panel.

. Also adjust the climate

control system to a setting that brings in only outside air. See “Climate Control Systems” in the Index. For more information about Carbon Monoxide, see Engine Exhaust on page 9-22.

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Towing a trailer requires a certain amount of experience. The combination you are driving is longer and not as responsive as the vehicle itself. Get acquainted with the handling and braking of the rig before setting out for the open road. Before starting, check all trailer hitch parts and attachments, safety chains, electrical connectors, lamps, tires, and mirrors. If the trailer has electric brakes, start the combination moving and then apply the trailer brake controller by hand to be sure the brakes work. During the trip, check occasionally to be sure that the load is secure and the lamps and any trailer brakes still work. 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 heavy braking and sudden turns.

Passing More passing distance is needed when towing a trailer. The combination will not accelerate as quickly and is longer so it is necessary to go much 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.

Driving and Operating

9-49

Making Turns

{ Caution

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. Do this so the trailer will not strike soft shoulders, curbs, road signs, trees, or other objects. Avoid jerky or sudden maneuvers. Signal well in advance. If the trailer turn signal bulbs burn out, the arrows on the instrument cluster will still flash for turns. It is important to check occasionally to be sure the trailer bulbs are still working.

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Driving and Operating

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 get hot and no longer work well. Vehicles can tow in D (Drive). Shift the transmission to a lower gear if the transmission shifts too often under heavy loads and/or hilly conditions. The Tow/Haul Mode may be used if the transmission shifts too often. See Tow/Haul Mode on page 9-30. When towing at high altitude on steep uphill grades, consider the following: 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 10-22. 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.

3. When the wheel chocks are in

place, release the regular brakes 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. 2. Start the engine. 3. Shift into a gear. 4. Release the parking brake. 5. Let up on the brake pedal. 6. Drive slowly until the trailer is

clear of the chocks.

7. Stop and have someone pick up

and store the chocks.

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Maintenance when Trailer Towing The vehicle needs service more often when pulling a trailer. See Maintenance Schedule on page 11-3. Things that are especially important in trailer operation are automatic transmission fluid, engine oil, axle lubricant, belts, cooling system, and brake system. It is a good idea to inspect these before and during the trip. Check periodically to see that all hitch nuts and bolts are tight.

Trailer Towing If the vehicle has a diesel engine, see the Duramax diesel supplement.

Driving and Operating

9-51

{ Warning

{ Caution

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.

Pulling a trailer improperly can damage the vehicle and result in costly repairs not covered by the vehicle warranty. To pull a trailer correctly, follow the advice in this section and see your dealer for important information about towing a trailer with the vehicle.

To identify the trailering capacity of the vehicle, read the information in “Weight of the Trailer” following. Trailering is different than just driving the vehicle by itself. Trailering means changes in handling, acceleration, braking, durability, and fuel economy. Successful, safe trailering takes correct equipment, and it has to be used properly. The following information has many time-tested, important trailering tips and safety rules. Many of these are important for your safety and that of

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Driving and Operating

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

your passengers. So please read this section carefully before pulling a trailer. Weight of the Trailer How heavy can a trailer safely be? It depends on how the rig is used. For example, speed, altitude, road grades, outside temperature, and how much the vehicle is used to pull a trailer are all important. It can depend on any special equipment on the vehicle, and the amount of tongue weight the vehicle can carry. See “Weight of the Trailer Tongue” later in this section. 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.

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Vehicle G1500 Cargo Van 2WD

4.3L V6
5.3L V8

H1500 Cargo Van AWD

5.3L V8

G1500 Passenger Van 2WD

5.3L V8

H1500 Passenger Van AWD

5.3L V8

G2500 Cargo Van 2WD Short Wheelbase

4.8L V8
6.0L V8

Driving and Operating

9-53

Axle Ratio

Maximum Trailer Weight

GCWR*

3.42
3.42
3.73

3.42

3.42
3.73

3.42
3.73

3.42
3.42

1 950 kg (4,300 lb) 3 039 kg (6,700 lb)

4 309 kg (9,500 lb) 5 443 kg (12,000 lb)

2 948 kg (6,500 lb)

5 443 kg (12,000 lb)

2 812 kg (6,200 lb)

5 443 kg (12,000 lb)

2 722 kg (6,000 lb)

5 443 kg (12,000 lb)

3 357 kg (7,400 lb) 4 536 kg (10,000 lb)

5 897 kg (13,000 lb) 7 257 kg (16,000 lb)

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Driving and Operating

Vehicle G2500 Cargo Van 2WD Long Wheelbase

Axle Ratio

Maximum Trailer Weight

GCWR*

4.8L V8
6.0L V8

G2500 Passenger Van 2WD Short Wheelbase

4.8L V8
6.0L V8

G3500 Cargo Van 2WD Short Wheelbase

4.8L V8
6.0L V8

G3500 Cargo Van 2WD Long Wheelbase

4.8L V8
6.0L V8

G3500 Passenger Van 2WD Short Wheelbase

6.0L V8

3.42
3.42

3.42
3.42

3.42
3.42

3.42
3.42

3.42

3 266 kg (7,200 lb) 4 536 kg (10,000 lb)

5 897 kg (13,000 lb) 7 257 kg (16,000 lb)

3 039 kg (6,700 lb) 4 445 kg (9,800 lb)

5 897 kg (13,000 lb)