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liftgate, trunk/hatch, or rear-most window is open. When towing a trailer:
(Continued)
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Warning (Continued)
. 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 0 192.
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
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right, move your hand to the right. Always back up slowly and, if possible, have someone guide you. 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 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 0 199. 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 0 270. 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. Maintenance when Trailer Towing The vehicle needs service more often when pulling a trailer. See Maintenance Schedule 0 346. Things that are especially important in trailer operation are automatic transmission fluid, engine oil, axle lubricant, belts, cooling system, and
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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. If the vehicle is bi-fuel, see the bi-fuel supplement. Do not tow a trailer during break-in. See New Vehicle Break-In 0 184 for more information.
{ Warning
The driver can lose control when pulling a trailer if the correct equipment is not used or the vehicle is not driven properly. For example, if the trailer is too heavy, the brakes may not work well or even at all. The driver and passengers could be seriously
(Continued)
Warning (Continued)
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.
Caution
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.
See Vehicle Load Limits 0 176 for more information about the vehicle's maximum load capacity.
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To identify the trailering capacity of the vehicle, read the information in “Weight of the Trailer” later in this section. 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 your passengers. 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. 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
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weight the vehicle can carry. See “Weight of the Trailer Tongue” later in this section for more information. Trailer weight rating (TWR) for pickup models is calculated assuming the tow vehicle has the driver, a front seat passenger, and all required trailering equipment. Weight of additional optional equipment, passengers, and cargo in the tow vehicle must be subtracted from the trailer weight rating. Ask your dealer for trailering information or advice. For kingpin weight and trailer tongue weight information, see “Weight of the Trailer Tongue” later in this section. Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options. Weights listed apply for conventional trailers and fifth-wheel trailers unless otherwise noted.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Vehicle
Axle Ratio
Maximum Trailer Weight
GCWR (a)
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1500 Series 2WD Crew Cab Standard Box
5.3L V8
6.2L V81500 Series 2WD Crew Cab Short Box (b)
5.3L V8
6.2L V81500 Series 4WD Crew Cab Standard Box
5.3L V8
6.2L V81500 Series 4WD Crew Cab Short Box (b)
5.3L V8
6.2L V82500 Series 2WD Crew Cab Standard Box
6.0L V8
6.0L V8 – Conventional Trailer 6.0L V8 – Fifth-Wheel Trailer2500 Series 4WD Crew Cab Standard Box
6.0L V8
3.42
3.233.42
3.233.42
3.233.42
3.233.73
4.10
4.103.73
4 218 kg (9,300 lb) 4 218 kg (9,300 lb)
6 804 kg (15,000 lb) 6 804 kg (15,000 lb)
4 264 kg (9,400 lb) 4 218 kg (9,300 lb)
6 804 kg (15,000 lb) 6 804 kg (15,000 lb)
4 128 kg (9,100 lb) 4 128 kg (9,100 lb)
6 804 kg (15,000 lb) 6 804 kg (15,000 lb)
4 128 kg (9,100 lb) 4 128 kg (9,100 lb)
6 804 kg (15,000 lb) 6 804 kg (15,000 lb)
4 445 kg (9,800 lb) 5 897 kg (13,000 lb) 6 486 kg (14,300 lb)
7 530 kg (16,600 lb) 9 571 kg (21,100 lb) 9 571 kg (21,100 lb)
4 309 kg (9,500 lb)
7 530 kg (16,600 lb)
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Vehicle
Axle Ratio
Maximum Trailer Weight
GCWR (a)
6.0L V8 – Conventional Trailer 6.0L V8 – Fifth-Wheel Trailer
3500 Series 2WD Crew Cab Standard Box
6.0L V8
6.0L V8 – Conventional Trailer 6.0L V8 Fifth-Wheel Trailer3500 Series 2WD Crew Cab Long Box
6.0L V8 (Single Rear Wheels) 6.0L V8 (Single Rear Wheels) 6.0L V8 (Dual Rear Wheels) 6.0L V8 (Dual Rear Wheels)
3500 Series 4WD Crew Cab Standard Box
6.0L V8
6.0L V8 – Conventional Trailer 6.0L V8 – Fifth-Wheel Trailer3500 Series 4WD Crew Cab Long Box
6.0L V8 (Single Rear Wheels) 6.0L V8 (Single Rear Wheels) Conventional Trailer
4.10
4.103.73
4.10
4.103.73
4.10
3.73
4.103.73
4.10
4.103.73
4.105 897 kg (13,000 lb) 6 350 kg (14,000 lb)
9 571 kg (21,100 lb) 9 571 kg (21,100 lb)
4 400 kg (9,700 lb) 5 897 kg (13,000 lb) 6 441 kg (14,200 lb)
7 530 kg (16,600 lb) 9 571 kg (21,100 lb) 9 571 kg (21,100 lb)
4 354 kg (9,700 lb) 6 396 kg (14,100 lb) 4 173 kg (9,200 lb) 6 214 kg (13,700 lb)
7 530 kg (16,600 lb) 9 571 kg (21,100 lb) 7 530 kg (16,600 lb) 9 571 kg (21,100 lb)
4 264 kg (9,400 lb) 5 897 kg (13,000 lb) 6 305 kg (13,900 lb)
7 530 kg (16,600 lb) 9 571 kg (21,100 lb) 9 571 kg (21,100 lb)
4 173 kg (9,200 lb) 5 897 kg (13,000 lb)
7 530 kg (16,600 lb) 9 571 kg (21,100 lb)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Vehicle
Axle Ratio
Maximum Trailer Weight
GCWR (a)
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6.0L V8 (Dual Rear Wheels) 6.0L V8 (Dual Rear Wheels)
7 530 kg (16,600 lb) 9 571 kg (21,100 lb) (a) The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be exceeded. (b) This model is neither designed nor intended to tow fifth-wheel or gooseneck trailers.
3 992 kg (8,800 lb) 6 033 kg (13,300 lb)
3.73
4.10Ask your dealer for trailering information or advice. Weight of the Trailer Tongue The tongue load (1) of any trailer is very important because it is also part of the vehicle weight. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo carried in it, and the people who will be riding in the vehicle as well as trailer tongue weight. Vehicle options, equipment, passengers and cargo in the vehicle reduce the amount of tongue weight the vehicle can carry, which will also reduce the trailer weight the vehicle can tow.
Trailer tongue weight (1) should be 10–15% and fifth-wheel or gooseneck kingpin weight should be 15–25% of the loaded trailer weight (2) up to the maximums for vehicle series and hitch type.
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Vehicle Series
1500
1500
2500/3500
Standard Box 2500/ 3500 Long Box 2500
3500 Single Rear Wheels 3500 Dual Rear WheelsHitch Type
Weight-Carrying
Weight-Distributing Weight-Carrying or Weight-Distributing Weight-Carrying or Weight-Distributing
Maximum Tongue
Weight
363 kg (800 lb) 544 kg (1,200 lb) 680 kg (1,500 lb)
907 kg (2,000 lb)
Fifth-Wheel Gooseneck Fifth-Wheel Gooseneck
1 361 kg (3,000 lb) 1 814 kg (4,000 lb)
Fifth-Wheel Gooseneck
2 495 kg (5,500 lb)
Do not exceed the maximum allowable tongue weight for the vehicle. Choose the shortest hitch extension that will position the hitch ball closest to the vehicle. This will help reduce the effect of trailer tongue weight on the rear axle. Trailer rating may be limited by the vehicle's ability to carry tongue weight. Tongue or kingpin weight cannot cause the vehicle to exceed
the GVWR (Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Axle Weight Rating). See “Total Weight on the Vehicle's Tires” later in this section. After loading the trailer, weigh the trailer and then the tongue, separately, to see if the weights are proper. If they are not, adjustments might be made by moving some items around in the trailer.
If a cargo carrier is used in the trailer hitch receiver, choose a carrier that positions the load as close to the vehicle as possible. Make sure the total weight, including the carrier, is no more than half of the maximum allowable tongue weight for the vehicle or 227 kg (500 lb), whichever is less. Total Weight on the Vehicle's Tires Be sure the vehicle's tires are inflated to the inflation pressures found on the Certification/Tire label on the center pillar or see Vehicle Load Limits 0 176. Make sure not to exceed the GVWR limit for the vehicle, or the RGAWR, with the tow vehicle and trailer fully loaded for the trip including the weight of the trailer tongue. If using a weight-distributing hitch, make sure not to exceed the RGAWR before applying the weight distribution spring bars.
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the Trailer Tongue” under Trailer Towing 0 231 for rating limits with various hitch types. If a step-bumper hitch will be used, the bumper could be damaged in sharp turns. Make sure there is ample room when turning to avoid contact between the trailer and the bumper. Consider using sway controls with any trailer. Ask a trailering professional about sway controls or refer to the trailer manufacturer's recommendations and instructions. Weight-Distributing Hitch and Adjustment A weight-distributing hitch may be useful with some trailers. Use the following guidelines to determine if a weight-distributing hitch should be used.
Weight of the Trailering Combination It is important that the combination of the tow vehicle and trailer does not exceed any of its weight ratings — GCWR, GVWR, RGAWR, Trailer Weight Rating, or Tongue Weight. The only way to be sure it is not exceeding any of these ratings is to weigh the tow vehicle and trailer combination, fully loaded for the trip, getting individual weights for each of these items.
Towing Equipment
Hitches The correct hitch equipment helps maintain combination control. Many trailers can be towed with a weight-carrying hitch which simply features a coupler latched to the hitch ball, or a tow eye latched to a pintle hook. Other trailers may require a weight-distributing hitch that uses spring bars to distribute the trailer tongue weight among the tow vehicle and trailer axles. Fifth-wheel and gooseneck hitches may also be used. See “Weight of
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Vehicle Series
Trailer Weight
1500
Up to 3175 kg (7,000 lb)
1500
2500/3500Over 3175 kg (7,000 lb) Up to 8165 kg (18,000 lb)
Weight-Distributing Hitch
Usage Optional
Required Optional
Hitch Distribution
Refer to trailer manufacturer’s recommendation
50%
Refer to trailer manufacturer’s recommendation
When using a weight-distributing hitch, measure distance (2) before coupling the trailer to the hitch ball. Measure the height again after the trailer is coupled and adjust the spring bars so the distance (2) is as close as possible to halfway between the two measurements. Fifth-Wheel and Gooseneck Trailering Fifth-wheel and gooseneck trailers can be used with many pickup models. These trailers place a larger percentage of the weight (kingpin weight) on the tow vehicle
than conventional trailers. Make sure this weight does not cause the vehicle to exceed GAWR or GVWR. Fifth-wheel or gooseneck kingpin weight should be 15 to 25% of the trailer weight up to the maximum amount specified in the trailering chart for the vehicle. See “Weight of the Trailer” under Trailer Towing 0 231. The hitch should be located in the pickup bed so that its centerline is over or slightly in front of the rear axle. Take care that it is not so far forward that it will contact the back of the cab in sharp turns. This is especially important for short box
1. Front of Vehicle 2. Body to Ground Distance
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
pickups. Trailer pin box extensions and sliding fifth-wheel hitch assemblies can help this condition. There should be at least 15 cm (6 in) of clearance between the top of the pickup box and the bottom of the trailer shelf that extends over the box. Safety Chains Always attach chains between the vehicle and the trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Instructions about safety chains may be provided by the hitch manufacturer or by the trailer manufacturer. If the trailer being towed weighs up to 2 271 kg (5,000 lb) with a factory-installed step bumper, safety chains may be attached to the attaching points on the bumper; otherwise, safety chains should be attached to holes on the trailer hitch platform. Always leave just enough slack so the combination can turn. Never allow safety chains to drag on the ground.
Trailer Brakes A loaded trailer that weighs more than 900 kg (2,000 lb) needs to have its own brake system that is adequate for the weight of the trailer. Be sure to read and follow the instructions for the trailer brakes so they are installed, adjusted, and maintained properly. Do not tap into the vehicle's hydraulic brake system. Auxiliary Battery The auxiliary battery provision can be used to supply electrical power to additional equipment that may be added, such as a slide-in camper. If equipped, this relay will be on the driver side of the vehicle, next to the underhood electrical center. Be sure to follow the proper installation instructions included with any electrical equipment that is installed.
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Caution
Leaving electrical equipment on for extended periods will drain the battery. Always turn off electrical equipment when not in use and do not use equipment that exceeds the maximum amperage rating of 30 amps for the auxiliary battery provision.
Trailer Wiring Harness The vehicle is equipped with one of the following wiring harnesses for towing a trailer or hauling a slide-in camper.
Basic Trailer Wiring All regular, double cab, and crew cab pickups have a seven-wire trailer towing harness. For vehicles not equipped with heavy-duty trailering, the harness is secured to the vehicle's frame behind the spare tire mount. The harness requires the installation of a trailer connector, which is available through your dealer.
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Heavy-Duty Trailer Wiring Harness Package
For vehicles equipped with heavy-duty trailering, the harness connector is mounted in the bumper.
For vehicles with the 5th wheel/ gooseneck trailer package, the harness connector is mounted on the inside of the pickup bed behind the rear wheel. The seven-wire harness contains the following trailer circuits: . Green/Violet: Left Stop/Turn
Signal
. Yellow/Gray: Right Stop/Turn
Signal
. Gray/Brown: Taillamps/Parking
Lamps
. White: Ground . White/Green: Back-up Lamps
. Red/Green: Battery Feed . Dark Blue: Trailer Brake If charging a remote (non-vehicle) battery, press the Tow/Haul Mode button, if equipped, at the end of the shift lever. This will boost the vehicle system voltage and properly charge the battery. If the trailer is too light for Tow/Haul Mode, or the vehicle is not equipped with Tow/ Haul, turn on the headlamps as a second way to boost the vehicle system and charge the battery.
Camper/Fifth-Wheel Trailer Wiring Package For vehicles without the 5th wheel/ gooseneck tralier package, seven-wire camper harness is under the rear bumper, attached to the frame near the rear crossmember. A connector must be added to the wiring harness that connects to the camper. The harness contains the following camper/trailer circuits: . Green/Violet: Left Stop/Turn
Signal
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
The harness should be installed by your dealer or a qualified service center. Tow/Haul Mode
Pressing this button at the end of the shift lever turns on and off the Tow/Haul Mode.
. Yellow/Gray: Right Stop/Turn
Signal
. Gray/Brown: Taillamps/Parking
Lamps
. White: Ground . White/Green: Back-up Lamps . Red/Green: Battery Feed . Dark Blue: Trailer Brake If the vehicle is equipped with the heavy-duty trailering option, see “Heavy-Duty Trailer Wiring Harness Package” earlier in this section. When the camper-wiring harness is ordered without the heavy-duty trailering package, a seven-wire harness with a seven-pin connector is at the rear of the vehicle and is tied to the vehicle's frame. Electric Brake Control Wiring Provisions These wiring provisions are included with the vehicle as part of the trailer wiring package. These provisions are for an electric brake controller.
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This indicator light on the instrument cluster comes on when the Tow/ Haul Mode is on. Tow/Haul is a feature that assists when pulling a heavy trailer or a large or heavy load. See Tow/Haul Mode 0 199. Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle's Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” under Trailer Towing 0 231. Tow/Haul is most useful under the following driving conditions: . When pulling a heavy trailer or a
large or heavy load through rolling terrain.
. When pulling a heavy trailer or a
large or heavy load in stop-and-go traffic.
. When pulling a heavy trailer or a
large or heavy load in busy parking lots where improved low speed control of the vehicle is desired.
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Operating the vehicle in Tow/Haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/ Haul is recommended only when pulling a heavy trailer or a large or heavy load. Integrated Trailer Brake Control System The vehicle may have an Integrated Trailer Brake Control (ITBC) system for use with electric trailer brakes or most electric over hydraulic trailer brakes.
The ITBC system is powered through the vehicle's electrical system. Turning the ignition off will also turn off the ITBC system. The ITBC system is fully functional only when the ignition is in ON/RUN.
{ Warning
Connecting a trailer that has an air brake system may result in reduced or complete loss of trailer braking. There may be an increase in stopping distance or trailer instability which could result in personal injury or damage to the vehicle, trailer, or other property. Use the ITBC system only with electric or electric over hydraulic trailer brakes.
This symbol is on the Trailer Brake Control Panel on vehicles with an ITBC system. The power output to the trailer brakes is based on the amount of brake pressure being applied by the vehicle’s brake system, and on the type of trailer brakes detected. This available power output to the trailer brakes can be adjusted to a wide range of trailering situations. The ITBC system is integrated with the vehicle’s brake, antilock brake, and StabiliTrak systems. In trailering conditions that cause the vehicle’s antilock brake or StabiliTrak systems to activate, power sent to the trailer's brakes will be automatically adjusted to minimize trailer wheel lock-up. This does not imply that the trailer has StabiliTrak. If the vehicle’s brake, antilock brake, or StabiliTrak systems are not functioning properly, the ITBC system may not be fully functional or may not function at all. Make sure all of these systems are fully operational to ensure full functionality of the ITBC system.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Trailer Brake Control Panel
1. Manual Trailer Brake Apply
Lever
2. Trailer Gain Adjustment
Buttons
The ITBC system has a control panel on the instrument panel to the left of the steering column. See Instrument Panel 0 6. The control panel allows adjustment to the amount of output, referred to as Trailer Gain, available to the trailer brakes and allows manual application of the trailer brakes. The Trailer Brake Control Panel is used along with the Trailer Brake Display
Page on the Driver Information Center (DIC) to adjust and display power output to the trailer brakes.
Trailer Brake DIC Display Page The ITBC system displays messages in the DIC. The display page indicates Trailer Gain setting, power output to the trailer brakes, trailer connection, and system operational status. To display the Trailer Brake Display Page, do any of the following: . Scroll through the DIC menu
pages.
. Press a Trailer Gain button.
If the Trailer Brake Display Page is not currently displayed, press a Trailer Gain button to recall the current Trailer Gain setting. Each press and release of the gain buttons will then change the Trailer Gain setting.
. Activate the Manual Trailer
Brake Apply Lever.
TRAILER GAIN: This setting can be adjusted from 0.0 to 10.0 with either a trailer connected or disconnected.
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To adjust the Trailer Gain, press one of the Trailer Gain Adjustment buttons. Press and hold a gain button to continuously adjust the Trailer Gain. To turn the output to the trailer off, adjust the Trailer Gain setting to 0.0 (zero). TRAILER OUTPUT: This displays anytime a trailer with electric brakes is connected. Output to the trailer brakes is based on the amount of vehicle braking present and relative to the Trailer Gain setting. Output is displayed from 0 to 100% for each gain setting. The Trailer Output will indicate “- - - - - -” on the Trailer Brake Display Page whenever the following occur: . No trailer is connected. . A trailer without electric brakes is connected (no DIC message will display).
. A trailer with electric brakes has
become disconnected (a CHECK TRAILER WIRING message will also display on the DIC).
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. There is a fault present in the wiring to the trailer brakes (a CHECK TRAILER WIRING message will also display on the DIC).
. The ITBC system is not working
due to a fault (a SERVICE TRAILER BRAKE SYSTEM message will also display in the DIC).
Manual Trailer Brake Apply The Manual Trailer Brake Apply Lever is used to apply the trailer’s electric brakes independent of the vehicle’s brakes. Sliding the lever to the left will apply only the trailer brakes. Use this lever to adjust Trailer Gain to properly adjust the power output to the trailer brakes. The trailer's and the vehicle's brake lamps will come on when either vehicle brakes or manual trailer brakes are applied.
Trailer Gain Adjustment Procedure Trailer Gain should be set for a specific trailering condition and must be adjusted anytime vehicle loading, trailer loading, or road surface conditions change.
Adjusting Trailer Gain at speeds lower than 32 to 40 km/h (20 to 25 mph) may result in an incorrect gain setting.
2. Adjust the Trailer Gain, using
{ Warning Trailer brakes that are over-gained or under-gained may not stop the vehicle and the trailer as intended and can result in a crash. Always follow the instructions to set the Trailer Gain for the proper trailer stopping performance.
Use the following to adjust Trailer Gain for each towing condition: 1. Drive the vehicle with the trailer
attached on a level road surface representative of the towing condition and free of traffic at about 32 to 40 km/h (20 to 25 mph) and fully apply the Manual Trailer Brake Apply Lever.
the Trailer Gain Adjustment Buttons, to just below the point of trailer wheel lock-up, indicated by trailer wheel squeal or tire smoke when a trailer wheel locks. Trailer wheel lock-up may not occur if towing a heavily loaded trailer. In this case, adjust the Trailer Gain to the highest allowable setting for the towing condition.
3. Readjust Trailer Gain anytime vehicle loading, trailer loading, or road surface conditions change or if trailer wheel lock-up is noticed at any time while towing.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Other ITBC-Related DIC Messages In addition to displaying TRAILER GAIN and OUTPUT through the DIC, trailer connection and ITBC system status are displayed on the DIC. TRAILER CONNECTED: This message will briefly display when a trailer with electric brakes is first connected to the vehicle. This message will automatically turn off in about 10 seconds. This message can be acknowledged before it automatically turns off. CHECK TRAILER WIRING: This message will display if: . The ITBC system first
determines connection to a trailer with electric brakes and then the trailer harness becomes disconnected from the vehicle. If the disconnect occurs while the vehicle is stationary, this message will automatically turn off in about 30 seconds. This message will also turn off if it is acknowledged or if the trailer harness is reconnected.
If the disconnect occurs while the vehicle is moving, this message will continue until the ignition is turned off. This message will also turn off if it is acknowledged or if the trailer harness is reconnected.
. There is an electrical fault in the wiring to the trailer brakes. This message will continue as long as there is an electrical fault in the trailer wiring. This message will also turn off if it is acknowledged.
To determine if the electrical fault is on the vehicle side or trailer side of the trailer wiring harness connection: 1. Disconnect the trailer wiring
harness from the vehicle.
2. Turn the ignition off. 3. Wait 10 seconds, then turn the
4.
ignition back to RUN. If the CHECK TRAILER WIRING message reappears, the electrical fault is on the vehicle side.
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If the CHECK TRAILER WIRING message only reappears when connecting the trailer wiring harness to the vehicle, the electrical fault is on the trailer side.
SERVICE TRAILER BRAKE SYSTEM: This message will display when there is a problem with the ITBC system. If this message continues over multiple ignition cycles, there is a problem with the ITBC system. Have the vehicle serviced. If either the CHECK TRAILER WIRING or SERVICE TRAILER BRAKE SYSTEM message displays while driving, the ITBC system may not be fully functional or may not function at all. When traffic conditions allow, carefully pull the vehicle over to the side of the road and turn the ignition off. Check the wiring connection to the trailer and turn the ignition back on. If either of these messages continues, either the vehicle or trailer needs service.
Adding non-dealer accessories can affect the vehicle performance. See Accessories and Modifications 0 252.
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A GM dealer may be able to diagnose and repair problems with the trailer. However, any diagnosis and repair of the trailer is not covered under the vehicle warranty. Contact your trailer dealer for assistance with trailer repairs and trailer warranty information.
Trailer Sway Control (TSC) Vehicles with StabiliTrak have a TSC feature. Trailer sway is unintended side-to-side motion of a trailer while being towed. If the vehicle is towing a trailer and the TSC detects that sway is increasing, the vehicle brakes are selectively applied at each wheel, to help reduce excessive trailer sway. If the vehicle is equipped with the Integrated Trailer Brake Control (ITBC) system, and the trailer has the electric actuated brake system, StabiliTrak may also apply the trailer brakes. If TSC is enabled, the Traction Control System (TCS)/StabiliTrak warning light will flash on the
instrument cluster. Vehicle speed must be reduced. If trailer sway continues, StabiliTrak can reduce engine torque to help slow the vehicle. See Traction Control/ Electronic Stability Control 0 208.
{ 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 0 237 for trailer ratings and hitch setup recommendations.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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) 0 115. 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 71 and Adding Equipment to the Airbag-Equipped Vehicle 0 72. For information on wiring auxiliary switches, see www.gmupfitter.com or contact your dealer.
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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.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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
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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) 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.
United States
Canada
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{ 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 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 0 176.
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 0 151
for switch location.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
General Information
General Information . . . . . . . . . . 252
California Proposition65 Warning . . . . . . . . . . . . . . . . . 252
California Perchlorate
Materials Requirements . . . . . 252
Accessories and
Modifications . . . . . . . . . . . . . . . . 252
Vehicle Checks Doing Your Own
Service Work . . . . . . . . . . . . . . . 253
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 254
Engine CompartmentOverview . . . . . . . . . . . . . . . . . . . . 255
Engine Oil . . . . . . . . . . . . . . . . . . . . 258
Engine Oil Life System . . . . . . . 261
Automatic Transmission Fluid(6 Speed Transmission) . . . . . 261
Automatic Transmission Fluid
(8 Speed Transmission) . . . . . 264
Engine Air Cleaner/Filter . . . . . . 265
Cooling System . . . . . . . . . . . . . . 266
Engine Coolant . . . . . . . . . . . . . . . 267
Engine Overheating . . . . . . . . . . 270
Overheated Engine ProtectionOperating Mode . . . . . . . . . . . . . 272
Engine Fan . . . . . . . . . . . . . . . . . . . 272Power Steering Fluid (1500
Series) . . . . . . . . . . . . . . . . . . . . . . 273
Power Steering Fluid (2500/
3500 Series) . . . . . . . . . . . . . . . . 273
Washer Fluid . . . . . . . . . . . . . . . . . 274
Brakes . . . . . . . . . . . . . . . . . . . . . . . 275
Brake Fluid . . . . . . . . . . . . . . . . . . . 275
Battery - North America . . . . . . 277
Four-Wheel Drive . . . . . . . . . . . . . 277
Front Axle . . . . . . . . . . . . . . . . . . . . 278
Rear Axle . . . . . . . . . . . . . . . . . . . . 279
Noise Control System . . . . . . . . 280
Starter Switch Check . . . . . . . . . 281
Automatic Transmission ShiftLock Control Function Check . . . . . . . . . . . . . . . . . . . . . . . 281
Ignition Transmission Lock
Check . . . . . . . . . . . . . . . . . . . . . . . 282
Park Brake and P (Park)
Mechanism Check . . . . . . . . . . 282
Wiper Blade Replacement . . . . 282
Glass Replacement . . . . . . . . . . 283Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 283
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 283
Halogen Bulbs . . . . . . . . . . . . . . . . 283
LED Lighting . . . . . . . . . . . . . . . . . 283Vehicle Care
251
Center High-Mounted
Stoplamp (CHMSL) and Cargo Lamp . . . . . . . . . . . . . . . . . 284
Replacement Bulbs . . . . . . . . . . . 284Electrical System
Electrical System Overload . . . 284
Fuses . . . . . . . . . . . . . . . . . . . . . . . . 285
Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 285
Instrument Panel Fuse Block
(Right) . . . . . . . . . . . . . . . . . . . . . . 288
Instrument Panel Fuse
Block (Left) . . . . . . . . . . . . . . . . . 290
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 292
All-Season Tires . . . . . . . . . . . . . . 293
Winter Tires . . . . . . . . . . . . . . . . . . 293
Low-Profile Tires . . . . . . . . . . . . . 294
All-Terrain Tires . . . . . . . . . . . . . . . 294
Tire Sidewall Labeling . . . . . . . . 294
Tire Designations . . . . . . . . . . . . . 297
Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . 298
Tire Pressure . . . . . . . . . . . . . . . . . 300
Tire Pressure for High-SpeedOperation . . . . . . . . . . . . . . . . . . . 302
Tire Pressure Monitor
System . . . . . . . . . . . . . . . . . . . . . . 302
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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 Pressure Monitor
Operation . . . . . . . . . . . . . . . . . . . 303
Tire Inspection . . . . . . . . . . . . . . . . 306
Tire Rotation . . . . . . . . . . . . . . . . . 306
When It Is Time for NewTires . . . . . . . . . . . . . . . . . . . . . . . . 309
Buying New Tires . . . . . . . . . . . . . 310
Different Size Tires andWheels . . . . . . . . . . . . . . . . . . . . . . 311
Uniform Tire Quality
Grading . . . . . . . . . . . . . . . . . . . . . 312
Wheel Alignment and Tire
Balance . . . . . . . . . . . . . . . . . . . . . 313
Wheel Replacement . . . . . . . . . . 313
Tire Chains . . . . . . . . . . . . . . . . . . . 314
If a Tire Goes Flat . . . . . . . . . . . . 315
Tire Changing . . . . . . . . . . . . . . . . 316
Full-Size Spare Tire . . . . . . . . . . 325Jump Starting
Jump Starting - North
America . . . . . . . . . . . . . . . . . . . . . 326
Towing the Vehicle
Towing the Vehicle . . . . . . . . . . . 331
Recreational VehicleTowing . . . . . . . . . . . . . . . . . . . . . . 331
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . 335
Interior Care . . . . . . . . . . . . . . . . . . 340
Floor Mats . . . . . . . . . . . . . . . . . . . . 343California 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
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 0 277
and Jump Starting - North America 0 326.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
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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.
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 72.
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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 0 372. This vehicle has an airbag system. Before attempting to do your own service work, see Servicing the Airbag-Equipped Vehicle 0 71. Keep a record with all parts receipts and list the mileage and the date of any service work performed. See Maintenance Records 0 358.
Caution
Even small amounts of contamination can cause damage to vehicle systems. Do not allow contaminants to contact the fluids, reservoir caps, or dipsticks.
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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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Engine Compartment Overview
Vehicle Care
255
5.3L V8 Engine Shown, 6.2L V8 Engine Similar
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9. Engine Oil Dipstick. See
“Checking Engine Oil” under Engine Oil 0 258.
10. Windshield Washer Fluid
Reservoir. See “Adding Washer Fluid” under Washer Fluid 0 274.
11. Brake Fluid Reservoir. See
Brake Fluid 0 275.
12. Engine Compartment Fuse
Block 0 285.
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Vehicle Care
1. Positive (+) Terminal. See
Jump Starting - North America 0 326.
2. Battery - North America 0 277. 3. Coolant Surge Tank and
Pressure Cap. See Cooling System 0 266.
4. Engine Air Cleaner/Filter 0 265. 5. Automatic Transmission
Dipstick (If Equipped). See “How to Check the Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) 0 261
or Automatic Transmission Fluid (8 Speed Transmission) 0 264.6. Remote Negative (-) Location.
See Jump Starting - North America 0 326.
7. Engine Cooling Fans (Out of View). See Cooling System 0 266.
8. Engine Oil Fill Cap. See “When
to Add Engine Oil” under Engine Oil 0 258.
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6.0L V8 Engine
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Vehicle Care
1. Positive (+) Terminal. See
Jump Starting - North America 0 326.
2. Battery - North America 0 277. 3. Coolant Surge Tank and
Pressure Cap. See Cooling System 0 266.
4. Engine Air Cleaner/Filter 0 265. 5. Automatic Transmission
Dipstick. See “How to Check the Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) 0 261 or Automatic Transmission Fluid (8 Speed Transmission) 0 264.
6. Engine Oil Dipstick. See
“Checking Engine Oil” under Engine Oil 0 258.
9. Remote Negative (–) Location.
See Jump Starting - North America 0 326.
10. Power Steering Fluid
Reservoir. See Power Steering Fluid (1500 Series) 0 273 or Power Steering Fluid (2500/ 3500 Series) 0 273.
11. Windshield Washer Fluid
Reservoir. See “Adding Washer Fluid” under Washer Fluid 0 274.
12. Brake Fluid Reservoir. See
Brake Fluid 0 275.
13. Auxiliary Battery (If Equipped).
See Battery - North America 0 277.
14. Engine Compartment Fuse
Block 0 285.
7. Engine Oil Fill Cap. See “When
to Add Engine Oil” under Engine Oil 0 258.
If the vehicle has a diesel engine and/or an Allison Transmission, see the Duramax diesel supplement.
8. Engine Cooling Fan (Out of View). See Cooling System 0 266.
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 0 261.
. Always dispose of engine oil
properly. See “What to Do with Used Oil” in this section.
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.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
See Engine Compartment Overview 0 255 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 0 360.
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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 0 255 for the location of the engine oil fill cap. Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when through.
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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 0 355.
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 6.0L V8 engine. 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 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. 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
