2016 Chevrolet Silverado Owners Manual

vehicle. See Traction Control/ Electronic Stability Control 0 303.

{ Warning

Even if the vehicle is equipped with TSC, trailer sway could result in loss of control and the vehicle could crash. If excessive trailer sway is detected, slow down to a safe speed. Check the trailer and vehicle to help correct possible causes. These could include an improperly or overloaded trailer, unrestrained cargo, improper trailer hitch configuration, excessive vehicle-trailer speed, or improperly inflated or incorrect vehicle or trailer tires. See Towing Equipment 0 339 for trailer ratings and hitch setup recommendations.

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Conversions and Add-Ons

Add-On Electrical Equipment

{ Warning

The Data Link Connector (DLC) is used for vehicle service and Emission Inspection/Maintenance testing. See Malfunction Indicator Lamp (Check Engine Light) 0 141
. A device connected to the DLC — such as an aftermarket fleet or driver-behavior tracking device — may interfere with vehicle systems. This could affect vehicle operation and cause a crash. Such devices may also access information stored in the vehicle’s systems.

Caution

Some electrical equipment can damage the vehicle or cause components to not work and would not be covered by the vehicle warranty. Always check with your dealer before adding electrical equipment.

Add-on equipment can drain the vehicle's 12-volt battery, even if the vehicle is not operating. The vehicle has an airbag system. Before attempting to add anything electrical to the vehicle, see Servicing the Airbag-Equipped Vehicle 0 84 and Adding Equipment to the Airbag-Equipped Vehicle 0 85. For information on wiring auxiliary switches, see www.gmupfitter.com or contact your dealer.

Driving and Operating

349

Adding a Snow Plow or Similar Equipment

Caution

Do not exceed 64 km/h (40 mph) with a snow plow mounted to the vehicle. The vehicle could overheat and be damaged.

Before installing a snow plow on the vehicle, here are some things you need to know:

Caution

If the vehicle does not have the snow plow prep package, adding a plow can damage the vehicle, and the repairs would not be covered by warranty. Unless the vehicle was built to carry a snow plow, do not add one to the vehicle. If the vehicle has the snow plow prep package, called RPO VYU, then the payload the vehicle can carry will be reduced

(Continued)

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Caution (Continued)

when a snow plow is installed. The vehicle can be damaged if either the front or rear axle ratings or the Gross Vehicle Weight Rating (GVWR) are exceeded.

Some vehicles are built with a special snow plow prep package, called RPO VYU. If the vehicle has this option, you can add a plow to it, provided certain weights, such as the weights on the vehicle's axles and the Gross Vehicle Weight Rating (GVWR), are not exceeded. The plow the vehicle can carry depends on many things, such as: . The options the vehicle came with, and the weight of those options.

. The weight and number of passengers intended to be carried.

. The weight of items added to the

vehicle, like a tool box or truck cap.

. The total weight of any

additional cargo intended to be carried.

Say, for example, you have a 318 kg (700 lb) snow plow. The total weight of all occupants and cargo inside the cab should not exceed 135 kg (300 lb). This means that you may only be able to carry one passenger. But, even this may be too much if there is other equipment already adding to the weight of the vehicle. Here are some guidelines for safely carrying a snow plow on the vehicle: . Make sure the weight on the front and rear axles does not exceed the axle rating for each. . For the front axle, if more cargo or passengers must be carried, appropriate counter ballast must be installed rear of the rear axle. Counter ballast must be properly secured so it will not move during driving.

. Follow the snow plow

manufacturer's recommendations regarding rear ballast. Rear ballast may be

required to ensure a proper front and rear weight distribution ratio, even though the actual weight at the front axle may be less than the front axle rating.

. The snow plow manufacturer or

installer can assist you in determining the amount of rear ballast required, to help make sure the snow plow/vehicle combination does not exceed the GVW rating, the front and rear axle ratings, and the front and rear weight distribution ratio.

. The total vehicle must not

exceed the GVW rating.

Front axle reserve capacity is the difference between the Gross Axle Weight Rating (GAWR) and the front axle weight of the vehicle with full fuel and passengers. Basically, it is the amount of weight that can be added to the front axle before reaching the front GAWR.

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351

United States

Canada

The front axle reserve capacity for the vehicle can be found in the lower right corner of the Certification/Tire label, as shown. In order to calculate the amount of weight any front accessory, such as a snow plow, is adding to the front axle, use the following formula:

(W x (A + W.B.)) /W.B.= Weight the accessory is adding to the front axle. Where:

W = Weight of added accessory A = Distance that the accessory is in front of the front axle W.B. = Vehicle Wheelbase For example, adding a 318 kg (700 lb) snow plow actually adds more than 318 kg (700 lb) to the front axle. Using the formula, if the snow plow is 122 cm (4 ft) in front of the front axle and the wheel base is 305 cm (10 ft), then:

W = 318 kg (700 lb) A = 122 cm (4 ft)

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W.B. = 305 cm (10 ft)

(W x (A + W.B.)/W.B. = (318 x (122 + 305))/305 = 445 kg (980 lb) So, if the front axle reserve capacity is more than 445 kg (980 lb), the snow plow could be added without exceeding the front GAWR. Heavier equipment can be added on the front of the vehicle if it is compensated for by carrying fewer passengers or less cargo, or by positioning cargo toward the rear. This has the effect of reducing the load on the front. However, the front GAWR, rear GAWR, and Gross Vehicle Weight Rating (GVWR) must never be exceeded.

{ Warning

On some vehicles that have certain front mounted equipment, such as a snow plow, it may be possible to load the front axle to the front gross axle weight rating (GAWR) but not have enough

(Continued)

Warning (Continued)

weight on the rear axle to have proper braking performance. If the brakes cannot work properly, you could have a crash. To help the brakes work properly when a snow plow is installed, always follow the snow plow manufacturer or installer's recommendation for rear ballast to ensure a proper front and rear weight distribution ratio, even though the actual front weight may be less than the front GAWR, and the total vehicle weight is less than the gross vehicle weight rating (GVWR). Maintaining a proper front and rear weight distribution ratio is necessary to provide proper braking performance.

Total vehicle reserve capacity is the difference between the GVWR and the weight of the truck with full fuel and passengers. It is the amount of weight that can be added to the

vehicle before reaching the GVWR. Keep in mind that reserve capacity numbers are intended as a guide when selecting the amount of equipment or cargo the truck can carry. If unsure of the vehicle's front, rear, or total weight, go to a weigh station and weigh the vehicle. Your dealer can also help with this. The total vehicle reserve capacity for the vehicle can be found in the lower right corner of the Certification/Tire label as shown previously. See your dealer for additional advice and information about using a snow plow on the vehicle. Also, see Vehicle Load Limits 0 267. Emergency Roof Lamp Provisions Vehicles with the RPO VYU snow plow prep package also have an emergency roof lamp provision package, RPO TRW. Wiring for the emergency roof lamp is provided above the overhead console. See Auxiliary Roof-Mounted Lamp 0 179
for switch location.

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353

Pickup Conversion to Chassis Cab We are aware that some vehicle owners might consider having the pickup box removed and a commercial or recreational body installed. Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which could affect vehicle safety. The components necessary to adapt a pickup to permit its safe use with a specialized body should be installed by the body builder.

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Vehicle Care

354
Vehicle Care

General Information

General Information . . . . . . . . . . 355
California Proposition

65 Warning . . . . . . . . . . . . . . . . . 355

California Perchlorate

Materials Requirements . . . . . 356

Accessories and

Modifications . . . . . . . . . . . . . . . . 356

Vehicle Checks Doing Your Own

Service Work . . . . . . . . . . . . . . . 356
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 357
Engine Compartment

Overview . . . . . . . . . . . . . . . . . . . . 358
Engine Oil . . . . . . . . . . . . . . . . . . . . 363
Engine Oil Life System . . . . . . . 366
Automatic Transmission Fluid

(6 Speed Transmission) . . . . . 367

Automatic Transmission Fluid

(8 Speed Transmission) . . . . . 370
Manual Transmission Fluid . . . 370
Hydraulic Clutch . . . . . . . . . . . . . . 370
Engine Air Cleaner/Filter . . . . . . 371
Cooling System . . . . . . . . . . . . . . 372
Engine Coolant . . . . . . . . . . . . . . . 373
Engine Overheating . . . . . . . . . . 376

Overheated Engine Protection

Operating Mode . . . . . . . . . . . . . 378
Engine Fan . . . . . . . . . . . . . . . . . . . 378
Power Steering Fluid (1500

Series) . . . . . . . . . . . . . . . . . . . . . . 379

Power Steering Fluid (2500/

3500 Series) . . . . . . . . . . . . . . . . 379
Washer Fluid . . . . . . . . . . . . . . . . . 379
Brakes . . . . . . . . . . . . . . . . . . . . . . . 380
Brake Fluid . . . . . . . . . . . . . . . . . . . 381
Battery - North America . . . . . . 382
Four-Wheel Drive . . . . . . . . . . . . . 383
Front Axle . . . . . . . . . . . . . . . . . . . . 384
Rear Axle . . . . . . . . . . . . . . . . . . . . 384
Noise Control System . . . . . . . . 386
Starter Switch Check . . . . . . . . . 387
Automatic Transmission Shift

Lock Control Function Check . . . . . . . . . . . . . . . . . . . . . . . 387

Ignition Transmission Lock

Check . . . . . . . . . . . . . . . . . . . . . . . 387

Park Brake and P (Park)

Mechanism Check . . . . . . . . . . 388
Wiper Blade Replacement . . . . 388
Glass Replacement . . . . . . . . . . 389

Headlamp Aiming

Headlamp Aiming . . . . . . . . . . . . 389

Bulb Replacement

Bulb Replacement . . . . . . . . . . . . 389

Halogen Bulbs . . . . . . . . . . . . . . . . 389
High Intensity Discharge (HID)

Lighting . . . . . . . . . . . . . . . . . . . . . 389
LED Lighting . . . . . . . . . . . . . . . . . 390
Headlamps, Front Turn Signal,

Sidemarker, and Parking Lamps . . . . . . . . . . . . . . . . . . . . . . 390
Fog Lamps . . . . . . . . . . . . . . . . . . . 390
Taillamps (Chassis Cab

Models) . . . . . . . . . . . . . . . . . . . . . 391

Taillamps, Turn Signal,

Stoplamps, and Back-Up Lamps . . . . . . . . . . . . . . . . . . . . . . 391

Center High-Mounted

Stoplamp (CHMSL) and Cargo Lamp . . . . . . . . . . . . . . . . . 392
Replacement Bulbs . . . . . . . . . . . 393

Electrical System

High Voltage Devices and

Wiring . . . . . . . . . . . . . . . . . . . . . . . 393
Electrical System Overload . . . 393
Fuses . . . . . . . . . . . . . . . . . . . . . . . . 394
Engine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . . . . 394

Instrument Panel Fuse Block

(Right) . . . . . . . . . . . . . . . . . . . . . . 397

Instrument Panel Fuse

Block (Left) . . . . . . . . . . . . . . . . . 399

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Wheels and Tires

Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 401
All-Season Tires . . . . . . . . . . . . . . 402
Winter Tires . . . . . . . . . . . . . . . . . . 402
Low-Profile Tires . . . . . . . . . . . . . 403
All-Terrain Tires . . . . . . . . . . . . . . . 403
Tire Sidewall Labeling . . . . . . . . 403
Tire Designations . . . . . . . . . . . . . 406
Tire Terminology and

Definitions . . . . . . . . . . . . . . . . . . 407
Tire Pressure . . . . . . . . . . . . . . . . . 410
Tire Pressure for High-Speed

Operation . . . . . . . . . . . . . . . . . . . 411

Tire Pressure Monitor

System . . . . . . . . . . . . . . . . . . . . . . 411

Tire Pressure Monitor

Operation . . . . . . . . . . . . . . . . . . . 412
Tire Inspection . . . . . . . . . . . . . . . . 416
Tire Rotation . . . . . . . . . . . . . . . . . 416
When It Is Time for New

Tires . . . . . . . . . . . . . . . . . . . . . . . . 418
Buying New Tires . . . . . . . . . . . . . 419
Different Size Tires and

Wheels . . . . . . . . . . . . . . . . . . . . . . 421

Uniform Tire Quality

Grading . . . . . . . . . . . . . . . . . . . . . 421

Wheel Alignment and Tire

Balance . . . . . . . . . . . . . . . . . . . . . 423
Wheel Replacement . . . . . . . . . . 423
Tire Chains . . . . . . . . . . . . . . . . . . . 424
If a Tire Goes Flat . . . . . . . . . . . . 425

Vehicle Care

355

General Information For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people. Genuine GM parts have one of these marks:

Tire Changing . . . . . . . . . . . . . . . . 426
Full-Size Spare Tire . . . . . . . . . . 435

Jump Starting

Jump Starting - North

America . . . . . . . . . . . . . . . . . . . . . 436

Towing the Vehicle

Towing the Vehicle . . . . . . . . . . . 441
Recreational Vehicle

Towing . . . . . . . . . . . . . . . . . . . . . . 441

Appearance Care

Exterior Care . . . . . . . . . . . . . . . . . 446
Interior Care . . . . . . . . . . . . . . . . . . 451
Floor Mats . . . . . . . . . . . . . . . . . . . . 453

California Proposition 65 Warning WARNING: Most motor vehicles, including this one, contain and/or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive

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harm. Engine exhaust, many parts and systems, many fluids, and some component wear by-products contain and/or emit these chemicals. See Battery - North America 0 382
and Jump Starting - North America 0 436.

California Perchlorate Materials Requirements Certain types of automotive applications, such as airbag initiators, safety belt pretensioners, and lithium batteries contained in Remote Keyless Entry transmitters, may contain perchlorate materials. Special handling may be necessary. For additional information, see www.dtsc.ca.gov/hazardouswaste/ perchlorate.

Accessories and Modifications Adding non-dealer accessories or making modifications to the vehicle can affect vehicle performance and safety, including such things as

airbags, braking, stability, ride and handling, emissions systems, aerodynamics, durability, and electronic systems like antilock brakes, traction control, and stability control. These accessories or modifications could even cause malfunction or damage not covered by the vehicle warranty. Damage to vehicle components resulting from modifications or the installation or use of non-GM certified parts, including control module or software modifications, is not covered under the terms of the vehicle warranty and may affect remaining warranty coverage for affected parts. GM Accessories are designed to complement and function with other systems on the vehicle. See your dealer to accessorize the vehicle using genuine GM Accessories installed by a dealer technician. Also, see Adding Equipment to the Airbag-Equipped Vehicle 0 85.

Vehicle Checks

Doing Your Own Service Work

{ Warning

It can be dangerous to work on your vehicle if you do not have the proper knowledge, service manual, tools, or parts. Always follow owner manual procedures and consult the service manual for your vehicle before doing any service work.

If doing some of your own service work, use the proper service manual. It tells you much more about how to service the vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information 0 485. This vehicle has an airbag system. Before attempting to do your own service work, see Servicing the Airbag-Equipped Vehicle 0 84.

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357

Keep a record with all parts receipts and list the mileage and the date of any service work performed. See Maintenance Records 0 470.

Caution

Even small amounts of contamination can cause damage to vehicle systems. Do not allow contaminants to contact the fluids, reservoir caps, or dipsticks.

Hood To open the hood:

1. Pull the handle with this symbol

on it. It is inside the vehicle under the steering wheel.

2. Go to the front of the vehicle to

find the secondary hood release. The handle is under the front edge of the hood near the center. Push the handle to the right and at the same time raise the hood.

Before closing the hood, be sure all the filler caps are on properly. Then bring the hood from full open to within 15 cm (6 in) from the closed position, pause, and push the front center of the hood with a swift, firm motion to fully close the hood.

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Vehicle Care

Engine Compartment Overview

4.3L V6 Engine

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359

9. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil 0 363.

10. Brake Fluid Reservoir. See

Brake Fluid 0 381.

11. Windshield Washer Fluid

Reservoir. See “Adding Washer Fluid” under Washer Fluid 0 379.

12. Clutch Fluid Reservoir (If Equipped). See Hydraulic Clutch 0 370.

13. Engine Compartment Fuse

Block 0 394.

1. Positive (+) Terminal. See

Jump Starting - North America 0 436.

2. Battery - North America 0 382. 3. Coolant Surge Tank and

Pressure Cap. See Cooling System 0 372.

4. Engine Air Cleaner/Filter 0 371. 5. Automatic Transmission

Dipstick (If Equipped). See “How to Check Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) 0 367
or Automatic Transmission Fluid (8 Speed Transmission) 0 370.

6. Remote Negative (–) Location.

See Jump Starting - North America 0 436.

7. Engine Cooling Fans (Out of View). See Cooling System 0 372.

8. Engine Oil Fill Cap. See “When

to Add Engine Oil” under Engine Oil 0 363.

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5.3L V8 Engine Shown, 6.2L V8 Engine Similar

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361

9. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil 0 363.

10. Windshield Washer Fluid

Reservoir. See “Adding Washer Fluid” under Washer Fluid 0 379.

11. Brake Fluid Reservoir. See

Brake Fluid 0 381.

12. Engine Compartment Fuse

Block 0 394.

1. Positive (+) Terminal. See

Jump Starting - North America 0 436.

2. Battery - North America 0 382. 3. Coolant Surge Tank and

Pressure Cap. See Cooling System 0 372.

4. Engine Air Cleaner/Filter 0 371. 5. Automatic Transmission

Dipstick (If Equipped). See “How to Check Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) 0 367
or Automatic Transmission Fluid (8 Speed Transmission) 0 370.

6. Remote Negative (–) Location

(Out of View). See Jump Starting - North America 0 436.

7. Engine Cooling Fans (Out of View). See Cooling System 0 372.

8. Engine Oil Fill Cap. See “When

to Add Engine Oil” under Engine Oil 0 363.

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6.0L V8 Engine

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1. Positive (+) Terminal. See

Jump Starting - North America 0 436.

2. Battery - North America 0 382. 3. Coolant Surge Tank and

Pressure Cap. See Cooling System 0 372.

4. Engine Air Cleaner/Filter 0 371. 5. Automatic Transmission

Dipstick (If Equipped). See “How to Check Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) 0 367
or Automatic Transmission Fluid (8 Speed Transmission) 0 370.

6. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil 0 363.

7. Engine Oil Fill Cap. See “When

to Add Engine Oil” under Engine Oil 0 363.

8. Engine Cooling Fan (Out of View). See Cooling System 0 372.

9. Remote Negative (–) Location.

See Jump Starting - North America 0 436.

10. Power Steering Fluid

Reservoir. See Power Steering Fluid (1500 Series) 0 379 or Power Steering Fluid (2500/ 3500 Series) 0 379.

11. Windshield Washer Fluid

Reservoir. See “Adding Washer Fluid” under Washer Fluid 0 379.

12. Brake Fluid Reservoir. See

Brake Fluid 0 381.

13. Auxiliary Battery (If Equipped).

See Battery - North America 0 382.

14. Engine Compartment Fuse

Block 0 394.

If the vehicle has a diesel engine and/or an Allison Transmission, see the Duramax diesel supplement. For an eAssist vehicle, see the Silverado/Sierra eAssist supplement.

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363

Engine Oil For diesel engine vehicles, see “Engine Oil” in the Duramax diesel supplement. To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these simple, but important steps will help protect your investment: . Use engine oil approved to the proper specification and of the proper viscosity grade. See “Selecting the Right Engine Oil” in this section.

. Check the engine oil level regularly and maintain the proper oil level. See “Checking Engine Oil” and “When to Add Engine Oil” in this section.

. Change the engine oil at the

appropriate time. See Engine Oil Life System 0 366.

. Always dispose of engine oil

properly. See “What to Do with Used Oil” in this section.

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Checking Engine Oil It is a good idea to check the engine oil level at each fuel fill. In order to get an accurate reading, the vehicle must be on level ground. The engine oil dipstick handle is a loop. See Engine Compartment Overview 0 358 for the location of the engine oil dipstick. If a low oil message displays on the DIC, it is important to park on level ground to accurately measure the oil level on the dipstick. Idling the vehicle on steep grades for a long time can influence the level sensing accuracy. Obtaining an accurate oil level reading is essential: 1.

If the engine has been running recently, turn off the engine and allow several minutes for the oil to drain back into the oil pan. Checking the oil level too soon after engine shutoff will not provide an accurate oil level reading.

{ Warning

The engine oil dipstick handle may be hot; it could burn you. Use a towel or glove to touch the dipstick handle.

2. Pull out the dipstick and wipe it

with a clean paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.

When to Add Engine Oil

If the oil is below the cross-hatched area at the tip of the dipstick, add 1 L (1 qt) of the recommended oil and then recheck the level. See “Selecting the Right Engine Oil” in this section for an explanation of

what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications 0 472.

Caution

Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If you find that you have an oil level above the operating range, i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, the engine could be damaged. You should drain out the excess oil or limit driving of the vehicle and seek a service professional to remove the excess amount of oil.

See Engine Compartment Overview 0 358 for the location of the engine oil fill cap.

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Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when through. Selecting the Right Engine Oil Selecting the right engine oil depends on both the proper oil specification and viscosity grade. See Recommended Fluids and Lubricants 0 466.

Specification Ask for and use engine oils that meet the dexos1™ specification. Engine oils that have been approved by GM as meeting the dexos1 specification are marked with the dexos1 approved logo. See www.gmdexos.com.

Caution

Failure to use the recommended engine oil or equivalent can result in engine damage not covered by the vehicle warranty.

Viscosity Grade Use SAE 0W-20 viscosity grade for the 5.3L and 6.2L V8 engines. Use SAE 5W-30 viscosity grade for the 4.3L V6, and 6.0L V8 engines. Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −29 °C (−20 °F), an SAE 0W-30 oil may be used in the 4.3L or 6.0L engine. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. When selecting an oil of the appropriate viscosity grade, it is recommended to select an oil of the correct specification. See “Specification” earlier in this section.

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365

Engine Oil Additives/Engine Oil Flushes Do not add anything to the oil. The recommended oils meeting the dexos1 specification are all that is needed for good performance and engine protection. Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty. What to Do with Used Oil Used engine oil contains certain elements that can be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly dispose of clothing or rags containing used engine oil. See the manufacturer's warnings about the use and disposal of oil products. Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the filter before disposal. Never dispose of oil by putting it in the

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trash or pouring it on the ground, into sewers, or into streams or bodies of water. Recycle it by taking it to a place that collects used oil.

Engine Oil Life System

When to Change Engine Oil This vehicle has a computer system that indicates when to change the engine oil and filter. This is based on a combination of factors which include engine revolutions, engine temperature, and miles driven. Based on driving conditions, the mileage at which an oil change is indicated can vary considerably. For the oil life system to work properly, the system must be reset every time the oil is changed. On some vehicles, when the system has calculated that oil life has been diminished, a CHANGE ENGINE OIL SOON message comes on to indicate that an oil change is necessary. See Engine Oil Messages 0 155. Change the oil as soon as possible within the next 1 000 km (600 mi). It is possible that, if driving under the best conditions,

the oil life system might indicate that an oil change is not necessary for up to a year. The engine oil and filter must be changed at least once a year and, at this time, the system must be reset. For vehicles without the CHANGE ENGINE OIL SOON message, an oil change is needed when the OIL LIFE REMAINING percentage is near 0%. Your dealer has trained service people who will perform this work and reset the system. It is also important to check the oil regularly over the course of an oil drain interval and keep it at the proper level. If the system is ever reset accidentally, the oil must be changed at 5 000 km (3,000 mi) since the last oil change. Remember to reset the oil life system whenever the oil is changed. How to Reset the Engine Oil Life System Reset the system whenever the engine oil is changed so that the system can calculate the next engine oil change. Always reset the

engine oil life to 100% after every oil change. It will not reset itself. To reset the engine oil life system: 1. Display the OIL LIFE

REMAINING on the DIC. If the vehicle does not have DIC buttons, the vehicle must be in P (Park) to access this display. See Driver Information Center (DIC) (Base Level) 0 148 or Driver Information Center (DIC) (Uplevel) 0 149.

2. Press and hold V, or the trip

odometer reset stem if the vehicle does not have DIC buttons, for several seconds. The oil life will change to 100%.

The oil life system can also be reset as follows: 1. Turn the ignition to ON/RUN

with the engine off.

2. Fully press the accelerator

pedal slowly three times within five seconds.

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3. Display the OIL LIFE

REMAINING on the DIC. If the display shows 100%, the system is reset.

If the vehicle has a CHANGE ENGINE OIL SOON message and it comes back on when the vehicle is started and/or the OIL LIFE REMAINING is near 0%, the engine oil life system has not been reset. Repeat the procedure.

Automatic Transmission Fluid (6 Speed Transmission)

When to Check and Change Automatic Transmission Fluid It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheated transmission. If a small leak is suspected, then use the following checking procedures to check the fluid level. However, if there is a large leak, then it may be necessary to have the vehicle towed to a

dealer service department and have it repaired before driving the vehicle further.

How to Check Automatic Transmission Fluid

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Caution

Use of the incorrect automatic transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants 0 466.

Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule 0 456. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants 0 466.

Caution

Too much or too little fluid can damage the transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Too little fluid could cause the transmission to overheat. Be sure to get an accurate reading if checking the transmission fluid.

Before checking the fluid level, prepare the vehicle: 1. Start the engine and park the

vehicle on a level surface. Keep the engine running.

2. Apply the parking brake and

place the shift lever in P (Park).

3. With your foot on the brake pedal, move the shift lever through each gear range, pausing for about

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three seconds in each range. Then, move the shift lever back to P (Park).

4. Allow the engine to idle (500–

800 rpm) for at least one minute. Slowly release the brake pedal.

5. Keep the engine running and

check the transmission fluid temperature on the Driver Information Center (DIC). See Driver Information Center (DIC) (Base Level) 0 148 or Driver Information Center (DIC) (Uplevel) 0 149.

6. Using the transmission fluid

temperature reading, determine and perform the appropriate check procedure. If the transmission fluid temperature reading is not within the required temperature ranges, allow the vehicle to cool, or operate the vehicle until the appropriate transmission fluid temperature is reached.

Cold Check Procedure Use this procedure only as a reference to determine if the transmission has enough fluid to be operated safely until a hot check procedure can be made. The hot check procedure is the most accurate method to check the fluid level. Perform the hot check procedure at the first opportunity. Use this cold check procedure to check fluid level when the transmission temperature is between 27 °C and 32 °C (80 °F and 90 °F).

2. Flip the handle up, then pull out

3.

the dipstick and wipe it with a clean rag or paper towel. Install the dipstick by pushing it back in all the way; wait three seconds, and then pull it back out again.

4. Check both sides of the

dipstick and read the lower level. Repeat the check procedure to verify the reading.

1. Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview 0 358.

5.

If the fluid level is below the COLD check band, add only enough fluid as necessary to bring the level into the COLD band. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill.

6. Perform a hot check at the first

opportunity after the transmission reaches a normal

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7.

operating temperature between 71 °C to 93 °C (160 °F to 200 °F). If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.

Hot Check Procedure Use this procedure to check the transmission fluid level when the transmission fluid temperature is between 71 °C and 93 °C (160 °F and 200 °F). The hot check is the most accurate method to check the fluid level. The hot check should be performed at the first opportunity in order to verify the cold check. The fluid level rises as fluid temperature increases, so it is important to ensure the transmission temperature is within range.

1. Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview 0 358.

2. Flip the handle up, then pull out

3.

the dipstick and wipe it with a clean rag or paper towel. Install the dipstick by pushing it back in all the way; wait three seconds, and then pull it back out again.

4. Check both sides of the

dipstick and read the lower level. Repeat the check procedure to verify the reading.

5. Safe operating level is within the HOT cross hatch band on the dipstick. If the fluid level is not within the HOT band, and the transmission temperature is between 71 °C and 93 °C (160 °F and 200 °F), add or drain fluid as necessary to bring the level into the HOT band. If the fluid level is low, add only enough fluid to bring the level into the HOT band. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.

6.

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Consistency of Readings Always check the fluid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If readings are still inconsistent, contact the dealer.

Automatic Transmission Fluid (8 Speed Transmission)

When to Check and Change Automatic Transmission Fluid It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheated transmission. This vehicle is not equipped with a transmission fluid level dipstick. There is a special procedure for checking and changing the transmission fluid in these vehicles. Because this procedure is difficult, this should be done at the dealer. Contact the dealer for additional information or the procedure can be found in the

service manual. See Service Publications Ordering Information 0 485.

Caution

Use of the incorrect automatic transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants 0 466.

Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule 0 456. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants 0 466.

Manual Transmission Fluid It is not necessary to check the manual transmission fluid level. A transmission fluid leak is the only reason for fluid loss. If a leak

occurs, take the vehicle to your dealer service department and have it repaired as soon as possible. See Recommended Fluids and Lubricants 0 466 for the proper fluid to use.

Hydraulic Clutch For vehicles with a manual transmission, it is not necessary to regularly check clutch fluid unless you suspect there is a leak in the system. Adding fluid will not correct a leak. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. When to Check and What to Use The hydraulic clutch fluid reservoir is filled with DOT 3 brake fluid as indicated on the reservoir cap. See Engine Compartment Overview 0 358 for reservoir location. How to Check and Add Fluid Visually check the clutch fluid reservoir to make sure the fluid level is at the MIN (minimum) line on the

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How to Inspect the Engine Air Cleaner/Filter Do not start the engine or have the engine running with the engine air cleaner/filter housing open. Before removing the engine air cleaner/ filter, make sure that the engine air cleaner/filter housing and nearby components are free of dirt and debris. Remove the engine air cleaner/filter. Lightly tap and shake the engine air cleaner/filter (away from the vehicle), to release loose dust and dirt. Inspect the engine air cleaner/filter for damage, and replace if damaged. Do not clean the engine air cleaner/filter or components with water or compressed air. To inspect or replace the engine air cleaner/filter:

side of the reservoir. The hydraulic clutch fluid system should be closed and sealed. Do not remove the cap to check the fluid level or to top-off the fluid level. Remove the cap only when necessary to add the proper fluid until the level reaches the MIN line.

Engine Air Cleaner/Filter If the vehicle has a diesel engine, see “Pickup Models” under “Engine Air Cleaner/Filter” in the Duramax diesel supplement for the correct inspection and replacement procedures. The engine air cleaner/filter is near the center of the engine compartment. See Engine Compartment Overview 0 358. When to Inspect the Engine Air Cleaner/Filter For intervals on changing and inspecting the engine air filter, see Maintenance Schedule 0 456.

1. Screws 2. Electrical Connectors 3. Air Duct Clamp

1. Locate the air cleaner/filter

assembly. See Engine Compartment Overview 0 358.

2. Disconnect the outlet duct by

loosening the air duct clamp (3).

3. Disconnect the electrical

connectors (2) and the connector harness from the cover.

4. Remove the four screws (1) on top of the cover of the housing and lift up the cover.

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5. Remove the engine air cleaner/

filter from the housing. Take care to dislodge as little dirt as possible.

6. Clean the engine air cleaner/ filter sealing surfaces and the housing. Inspect or replace the engine air cleaner/filter.

7.

8. Reverse Steps 2–4 to reinstall

the filter cover housing.

{ Warning

Operating the engine with the air cleaner/filter off can cause you or others to be burned. The air cleaner not only cleans the air; it helps to stop flames if the engine backfires. Use caution when working on the engine and do not drive with the air cleaner/filter off.

Caution

If the air cleaner/filter is off, dirt can easily get into the engine, which could damage it. Always have the air cleaner/filter in place when you are driving.

Cooling System If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement. The cooling system allows the engine to maintain the correct working temperature.

5.3L V8 Engine Shown, 4.3L V6 Engine and 6.2L V8 Engine

Similar

1. Coolant Surge Tank 2. Coolant Surge Tank

Pressure Cap

3. Engine Electric Cooling

Fans (Out of View) { Warning

An electric engine cooling fan can start even when the engine is not running. To avoid injury, always

(Continued)

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Warning (Continued)

keep hands, clothing, and tools away from any engine cooling fan.

6.0L V8 Engine

1. Coolant Surge Tank 2. Coolant Surge Tank

Pressure Cap

3. Engine Belt-Driven Cooling

Fan (Out of View)

{ Warning

Heater and radiator hoses, and other engine parts, can be very hot. Do not touch them. If you do, you can be burned. Do not run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned. Get any leak fixed before you drive the vehicle.

Caution

Using coolant other than DEX-COOL® can cause premature engine, heater core, or radiator corrosion. In addition, the engine coolant could require changing sooner. Any repairs would not be covered by the vehicle warranty. Always use DEX-COOL (silicate-free) coolant in the vehicle.

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Engine Coolant The cooling system in the vehicle is filled with DEX-COOL® engine coolant. This coolant is designed to remain in the vehicle for 5 years or 240 000 km (150,000 mi), whichever occurs first. The following explains the cooling system and how to check and add coolant when it is low. If there is a problem with engine overheating, see Engine Overheating 0 376. What to Use

{ Warning

Adding only plain water or some other liquid to the cooling system can be dangerous. Plain water and other liquids, can boil before the proper coolant mixture will. The coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, the engine could get too hot but you would not get the

(Continued)

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Warning (Continued)

Caution

overheat warning. The engine could catch fire and you or others could be burned. Use a 50/ 50 mixture of clean, drinkable water and DEX-COOL coolant.

Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. If using this mixture, nothing else needs to be added. This mixture: . Gives freezing protection down

to −37 °C (−34 °F), outside temperature.

. Gives boiling protection up to

129 °C (265 °F), engine temperature.

. Protects against rust and

corrosion.

. Will not damage aluminum parts. . Helps keep the proper engine

temperature.

If improper coolant mixture, inhibitors, or additives are used in the vehicle cooling system, the engine could overheat and be damaged. Too much water in the mixture can freeze and crack engine cooling parts. The repairs would not be covered by the vehicle warranty. Use only the proper mixture of engine coolant for the cooling system. See Recommended Fluids and Lubricants 0 466.

Never dispose of engine coolant by putting it in the trash, or by pouring it on the ground, or into sewers, streams, or bodies of water. Have the coolant changed by an authorized service center, familiar with legal requirements regarding used coolant disposal. This will help protect the environment and your health.

Checking Coolant The coolant surge tank is located in the engine compartment on the passenger side of the vehicle. See Engine Compartment Overview 0 358. The vehicle must be on a level surface when checking the coolant level. Check to see if coolant is visible in the coolant surge tank. If the coolant inside the coolant surge tank is boiling, wait until it cools down. The coolant level should be at or above the FULL COLD mark. If it is not, there may be a leak in the cooling system. If coolant is visible but the coolant level is not at or above the FULL COLD mark, see “How to Add Coolant to the Coolant Surge Tank for Gasoline Engines,” following.

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Warning (Continued)

and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine.

Caution

This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause the engine to overheat and be severely damaged.

{ Warning

Steam and scalding liquids from a hot cooling system can blow out and burn you badly. Never turn the cap when the cooling system, including the surge tank pressure cap, is hot. Wait for the cooling system and surge tank pressure cap to cool.

If no coolant is visible in the surge tank, add coolant.

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Light-Duty

Heavy-Duty

Coolant Surge

Coolant Surge

Tank

Tank

Pressure Cap

Pressure Cap

1. Remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise about one full turn. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left. 2. Keep turning the pressure cap

slowly, and remove it.

3. Fill the coolant surge tank with the proper mixture to the FULL COLD mark.

5.3L V8 Shown, 4.3L V6, 6.0L V8,

and 6.2L V8 Similar

How to Add Coolant to the Coolant Surge Tank for Gasoline Engines If the vehicle has a diesel engine, see “Cooling System” in the Duramax diesel supplement for the proper coolant fill procedure.

{ Warning

You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol

(Continued)

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4. With the coolant surge tank

pressure cap off, start the engine and let it run until the engine coolant temperature gauge indicates approximately 90 °C (195 °F). By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the FULL COLD mark.

5. Replace the pressure cap

tightly.

6. Verify coolant level after the

engine is shut off and the coolant is cold. If necessary, repeat coolant fill procedure Steps 1-6.

Caution

If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured.

Engine Overheating If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement.

Caution

Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty.

The vehicle has several indicators to warn of engine overheating. There is a coolant temperature gauge in the vehicle's instrument cluster. See Engine Coolant Temperature Gauge 0 135. In addition, there are ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and ENGINE POWER IS REDUCED messages in the Driver Information Center (DIC). See Engine Cooling System Messages 0 154 and Engine Power Messages 0 155.

If the decision is made not to lift the hood when this warning appears, get service help right away. See Roadside Assistance Program 0 480. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface.

4.3L V6, 5.3L V8, and 6.2L V8 Engines Check to see if the engine cooling fans are running. If the engine is overheating, the fans should be running. If they are not, do not continue to run the engine and have the vehicle serviced. If Steam is Coming from the Engine Compartment { Warning

Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it

(Continued)

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Warning (Continued)

off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when the engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool.

If No Steam is Coming from the Engine Compartment The ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message, along with a low coolant condition, can indicate a serious problem.

If there is an engine overheat warning, but no steam is seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle: . Climbs a long hill on a hot day. . Stops after high-speed driving. Idles for long periods in traffic. . Tows a trailer; see Trailer Towing

0 325.

If the ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message appears with no sign of steam, try this for a minute or so: 1. Turn the air conditioning off. 2. Turn the heater on to the

highest temperature and to the highest fan speed. Open the windows as necessary.

3. When it is safe to do so, pull off

the road, shift to P (Park) or N (Neutral) and let the engine idle.

If the temperature overheat gauge is no longer in the overheat zone or an overheat warning no longer

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377

displays, the vehicle can be driven. Continue to drive the vehicle slowly for about 10 minutes. Keep a safe vehicle distance from the vehicle in front. If the warning does not come back on, continue to drive normally and have the cooling system checked for proper fill and function. If the warning continues, pull over, stop, and park the vehicle right away. If there is still no sign of steam and the vehicle is equipped with an engine driven cooling fan, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least five minutes while the vehicle is parked. If the warning is still there, turn off the engine and get everyone out of the vehicle until it cools down. If there is no sign of steam, idle the engine for five minutes while parked. If the warning is still displayed, turn off the engine until it cools down.

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Overheated Engine Protection Operating Mode If an overheated engine condition exists and the ENGINE POWER IS REDUCED message displays, an overheat protection mode which alternates firing groups of cylinders helps to prevent engine damage. In this mode, a loss in power and engine performance will be noticed. This operating mode allows the vehicle to be driven to a safe place in an emergency. Driving extended distances and/or towing a trailer in the overheat protection mode should be avoided.

Caution

After driving in the overheated engine protection operating mode, the engine oil will be severely degraded. Any repairs performed before the engine is cool may cause engine damage. Allow the engine to cool before

(Continued)

Caution (Continued)

attempting any repair. Repair the cause of coolant loss, change the oil, and reset the oil life system. See Engine Oil 0 363.

Engine Fan If the vehicle has a clutched engine cooling fan, when the clutch is engaged, the fan spins faster to provide more air to cool the engine. In most everyday driving conditions, the fan is spinning slower and the clutch is not fully engaged. This improves fuel economy and reduces fan noise. Under heavy vehicle loading, trailer towing, and/or high outside temperatures, the fan speed increases as the clutch more fully engages, so an increase in fan noise may be heard. This is normal and should not be mistaken as the transmission slipping or making extra shifts. It is merely the cooling system functioning properly. The fan will slow down when additional cooling is not required and the clutch disengages.

This fan noise may also be heard when starting the engine. It will go away as the fan clutch partially disengages. If the vehicle has electric cooling fans, the fans may be heard spinning at low speed during most everyday driving. The fans may turn off if no cooling is required. Under heavy vehicle loading, trailer towing, high outside temperatures, or operation of the air conditioning system, the fans may change to high speed and an increase in fan noise may be heard. This is normal and indicates that the cooling system is functioning properly. The fans will change to low speed when additional cooling is no longer required. The electric engine cooling fans may run after the engine has been turned. off. This is normal and no service is required.

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Power Steering Fluid (1500 Series) The vehicle has electric power steering and does not use power steering fluid.

Power Steering Fluid (2500/3500 Series)

See Engine Compartment Overview 0 358 for reservoir location. When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless there is a leak suspected in the system or an unusual noise is heard. A fluid loss in this system could indicate a problem. Have the system inspected and repaired.

Wait for the power steering system to cool, with the engine off, before checking the fluid. How to Check Power Steering Fluid To check the power steering fluid: 1. Turn the key off and let the

engine compartment cool down.

2. Wipe the cap and the top of the

reservoir clean.

3. Unscrew the cap and wipe the

dipstick with a clean rag.

4. Replace the cap and completely tighten it.

5. Remove the cap again and look at the fluid level on the dipstick.

The level should be between the ADD and FULL marks. If necessary, add only enough fluid to bring the level up to the hashed area between the ADD and FULL marks.

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What to Use To determine what kind of fluid to use, see Recommended Fluids and Lubricants 0 466. Always use the proper fluid.

Caution

Use of the incorrect fluid may damage the vehicle and the damages may not be covered by the vehicle warranty. Always use the correct fluid listed in Recommended Fluids and Lubricants 0 466.

Washer Fluid

What to Use When windshield washer fluid needs to be added, be sure to read the manufacturer's instructions before use. Use a fluid that has sufficient protection against freezing in an area where the temperature may fall below freezing.

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Adding Washer Fluid The vehicle has a low washer fluid message on the DIC that comes on when the washer fluid is low. The message is displayed for 15 seconds at the start of each ignition cycle. When the WASHER FLUID LOW ADD FLUID message displays, washer fluid will need to be added to the windshield washer fluid reservoir.

Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview 0 358 for reservoir location.

Caution

Caution (Continued)

. Do not use washer fluid that

contains any type of water repellent coating. This can cause the wiper blades to chatter or skip.

. Do not use engine coolant

(antifreeze) in the windshield washer. It can damage the windshield washer system and paint.

. Do not mix water with

ready-to-use washer fluid. Water can cause the solution to freeze and damage the washer fluid tank and other parts of the washer system.

. When using concentrated

washer fluid, follow the manufacturer instructions for adding water.

. Fill the washer fluid tank

only three-quarters full when it is very cold. This allows for fluid expansion if

(Continued)

freezing occurs, which could damage the tank if it is completely full.

Brakes Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. The sound can come and go or be heard all the time the vehicle is moving, except when applying the brake pedal firmly.

{ Warning

The brake wear warning sound means that soon the brakes will not work well. That could lead to a crash. When the brake wear warning sound is heard, have the