ECO mode CHEVROLET TAHOE 2004 2.G Service Manual

If yours was built with trailering options, as many are,
it’s ready for heavier trailers. But trailering is different
than just driving your vehicle by itself. Trailering means
changes in acceleration, braking, handling, durability
and fuel economy. Successful, safe trailering takes
correct equipment, and it has to be used properly.
That’s the reason for this part. In it are many time-tested,
important trailering tips and safety rules. Many of
these are important for your safety and that of your
passengers. So please read this section carefully before
you pull a trailer.
If You Do Decide To Pull A Trailer
If you do, here are some important points:
There are many different laws, including speed limit
restrictions, having to do with trailering. Make sure
your rig will be legal, not only where you live
but also where you’ll be driving. A good source for
this information can be state or provincial police.
Consider using a sway control. See “Hitches” later
in this section.
Don’t tow a trailer at all during the rst 500 miles
(800 km) your new vehicle is driven. Your engine,
axle or other parts could be damaged.
Then, during the rst 500 miles (800 km) that you
tow a trailer, don’t drive over 50 mph (80 km/h)
and don’t make starts at full throttle. This helps your
engine and other parts of your vehicle wear in at
the heavier loads.
You can tow in DRIVE (D). You may want to shift
the transmission to THIRD (3) or, if necessary, a
lower gear selection if the transmission shifts
too often (e.g., under heavy loads and/or hilly
conditions). See “Tow/Haul Mode” later in
this section.
Three important considerations have to do with weight:
The weight of the trailer
The weight of the trailer tongue
The weight on your vehicle’s tires
4-66

Tow/Haul Mode
Tow/Haul is a feature that assists when pulling a heavy
trailer or a large or heavy load. The purpose of the
Tow/Haul mode is to:
Reduce the frequency and improve the predictability
of transmission shifts when pulling a heavy trailer or
a large or heavy load.
Provide the same solid shift feel when pulling a
heavy trailer or a large or heavy load as when
the vehicle is unloaded.
Improve control of vehicle speed while requiring
less throttle pedal activity when pulling a heavy
trailer or a large or heavy load.
Your vehicle may be equipped with a button at the end
of the shift lever which, when pressed, enables
tow/haul. Your vehicle may be equipped with
Autoride™
®which further improves your vehicle’s ride
while towing. SeeAutoride™ on page 4-64for more
information. When the button is pressed, a light on the
instrument panel will illuminate to indicate that
Tow/Haul has been selected. Tow/Haul may be turned
off by pressing the button again, at which time the
indicator light on the instrument panel will turn off. The
vehicle will automatically turn off Tow/Haul every
time it is started.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 later in this section.
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.
Operating the vehicle in tow/haul when lightly loaded or
with no trailer at all will not cause damage. However,
there is no benet 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.
4-67

Occupant Distribution:Designated seating positions.
Outward Facing Sidewall:The side of a asymmetrical
tire that has a particular side that faces outward
when mounted on a vehicle. The side of the tire that
contains a whitewall, bears white lettering or bears
manufacturer, brand and or model name molding that is
higher or deeper than the same moldings on the
other sidewall of the tire.
Passenger (P-Metric) Tire:A tire used on passenger
cars and some light duty trucks and multipurpose
vehicles.
Recommended Ination Pressure:Vehicle
manufacturer’s recommended tire ination pressure and
shown on the tire placard. SeeInation - Tire Pressure
on page 5-69andLoading Your Vehicle on page 4-58.
Radial Ply tire:A pneumatic tire in which the ply cords
that extend to the beads are laid at 90 degrees to the
centerline of the tread.
Rim:A metal support for a tire and upon which the tire
beads are seated.
Sidewall:The portion of a tire between the tread and
the bead.
Speed Rating:An alphanumeric code assigned to a
tire indicating the maximum speed at which a tire
can operate.Traction:The friction between the tire and the road
surface. The amount of grip provided.
Tread:The portion of a tire that comes into contact
with the road.
Treadwear Indicators:Narrow bands, sometimes
called “wear bars,” that show across the tread of a tire
when only 2/32 inch of tread remains. SeeWhen It
Is Time for New Tires on page 5-74.
UTQGS:Uniform Tire Quality Grading Standards,
a tire information system that provides consumers with
ratings for a tire’s traction, temperature and treadwear.
Ratings are determined by tire manufacturers using
government testing procedures. The ratings are molded
into the sidewall of the tire. SeeUniform Tire Quality
Grading on page 5-76.
Vehicle Capacity Weight:The number of designated
seating positions multiplied by 150 lbs. (68 kg) plus
the rated cargo load. SeeLoading Your Vehicle
on page 4-58.
Vehicle Maximum Load on the Tire:Load on an
individual tire due to curb weight, accessory weight,
occupant weight and cargo weight.
Vehicle Placard:A label permanently attached to a
vehicle showing the original equipment tire size
and recommended ination pressure. SeeLoading
Your Vehicle on page 4-58.
5-68

Capacities and Specications
Please refer toRecommended Fluids and Lubricants on page 6-13for more information. All capacities are approximate.
Capacities and Specications
Engine VIN Code Spark Plug Gap
VORTEC™ 4800 V8 V 0.040 inches (1.01 mm)
VORTEC™ 5300 V8 T 0.040 inches (1.01 mm)
VORTEC™ 5300 V8 Z 0.040 inches (1.01 mm)
VORTEC™ 6000 V8 U 0.040 inches (1.01 mm)
VORTEC™ 8100 V8 G 0.060 inches (1.52 mm)
Wheels and Tires
Model Description Torque
C/K 1500 6 bolts (14 mm) 140 lb ft (190Y)
C/K 2500 8 bolts (14 mm) 140 lb ft (190Y)
Tire PressureSee the Certication/Tire label on the rear edge of the driver’s door
or the incomplete vehicle document in the cab.
5-118

Additional Program Information
Courtesy Transportation is available during the
Bumper-to-Bumper warranty coverage period, but itis
notpart of the New Vehicle Limited Warranty. A
separate booklet entitled “Warranty and Owner
Assistance Information” furnished with each new vehicle
provides detailed warranty coverage information.
Courtesy Transportation is available only at participating
dealers and all program options, such as shuttle
service, may not be available at every dealer. Please
contact you dealer for specic information about
availability. All Courtesy Transportation arrangements
will be administered by appropriate dealer personnel.
Canadian Vehicles:For warranty repairs during
the Complete Vehicle Coverage period of the General
Motors of Canada New Vehicle Limited Warranty,
alternative transportation may be available under the
Courtesy Transportation Program. Please consult
your dealer for details.
General Motors reserves the right to unilaterally modify,
change or discontinue Courtesy Transportation at
any time and to resolve all questions of claim eligibility
pursuant to the terms and conditions described
herein at its sole discretion.
Vehicle Data Collection and Event
Data Recorders
Your vehicle, like other modern motor vehicles, has a
number of sophisticated computer systems that monitor
and control several aspects of the vehicle’s
performance. Your vehicle uses on-board vehicle
computers to monitor emission control components to
optimize fuel economy, to monitor conditions for air bag
deployment and, if so equipped, to provide anti-lock
braking and to help the driver control the vehicle
in difficult driving situations. Some information may be
stored during regular operations to facilitate repair
of detected malfunctions; other information is stored only
in a crash or near crash event by computer systems
commonly called event data recorders (EDR).
In a crash or near crash event, computer systems, such
as the Air Bag Sensing and Diagnostic Module (SDM)
in your vehicle may record information about the
condition of the vehicle and how it was operated, such
as engine speed, brake applications, throttle position,
vehicle speed, safety belt usage, air bag readiness, air
bag performance data, and the severity of a collision.
This information has been used to improve vehicle crash
performance and may be used to improve crash
performance of future vehicles and driving safety. Unlike
the data recorders on many airplanes, these on-board
systems do not record sounds, such as conversation of
vehicle occupants.
7-9

M
Maintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill.........................................6-10
At Least Once a Month................................6-10
At Least Once a Year..................................6-11
Introduction.................................................. 6-2
Maintenance Footnotes.................................. 6-8
Maintenance Record....................................6-18
Maintenance Requirements............................. 6-2
Normal Maintenance Replacement Parts.........6-15
Owner Checks and Services.........................6-10
Recommended Fluids and Lubricants.............6-13
Scheduled Maintenance................................. 6-4
Using Your................................................... 6-2
Your Vehicle and the Environment................... 6-2
Maintenance When Trailer Towing.....................4-77
Making Turns.................................................4-75
Malfunction Indicator Light................................3-50
Manual Seats................................................... 1-3
Manual Windows............................................2-16
Matching Transmitter(s) to Your Vehicle............... 2-6
Memory Seat.................................................2-67
Message
DIC Warnings and Messages........................3-68
Mexico, Central America and Caribbean Islands/
Countries (Except Puerto Rico and U.S. Virgin
Islands) – Customer Assistance........................ 7-5Mirrors
Automatic Dimming Rearview with Compass
and Temperature Display...........................2-49
Automatic Dimming Rearview with OnStar®,
Compass and Temperature Display.............2-45
Manual Rearview Mirror................................2-45
Outside Automatic Dimming Mirror.................2-54
Outside Camper-Type Mirrors........................2-52
Outside Convex Mirror.................................2-55
Outside Curb View Assist Mirrors...................2-54
Outside Heated Mirrors................................2-55
Outside Manual Mirrors................................2-51
Outside Power Camper-Type.........................2-53
Outside Power Foldaway Mirrors....................2-53
Outside Power Mirrors..................................2-52
Model Reference................................................ vi
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-21
Normal Maintenance Replacement Parts............6-15
O
Odometer......................................................3-41
Off-Road Driving.............................................4-23
Off-Road Recovery..........................................4-20
10

Tires (cont.)
Changing a Flat Tire....................................5-80
If a Tire Goes Flat.......................................5-80
Ination - Tire Pressure................................5-69
Inspection and Rotation................................5-72
Pressure Monitor System..............................5-70
Spare Tire................................................5-100
Uniform Tire Quality Grading.........................5-76
Wheel Alignment and Tire Balance.................5-77
Wheel Replacement.....................................5-77
When It Is Time for New Tires......................5-74
To Use the Engine Coolant Heater....................2-25
Top Strap......................................................1-58
Top Strap Anchor Location...............................1-59
Torque Lock...................................................2-41
Total Weight on Your Vehicle’s Tires..................4-72
Tow/Haul Mode...............................................2-29
Tow/Haul Mode Light.......................................3-54
Towing
Recreational Vehicle.....................................4-55
Towing a Trailer..........................................4-65
Your Vehicle...............................................4-55
Traction
Assist System (TAS)...................................... 4-9
Off Light.....................................................3-46
Stabilitrak
®System......................................4-12
TRACTION ACTIVE........................................3-75
Traction Control Operation................................4-13
TRACTION SYS LIMITED................................3-75Trailer
Recommendations.......................................4-65
Trailer Brakes.................................................4-73
Trailer Wiring Harness.....................................4-78
Transfer Case........................................5-50, 5-52
Transmission
Fluid, Automatic...........................................5-24
Temperature Gage.......................................3-48
TRANSMISSION HOT.....................................3-75
Transmission Operation, Automatic....................2-26
Transmission, Transaxle, Transfer Case Unit
Repair Manual............................................7-11
Transportation Options...................................... 7-8
Traveling to Remote Areas...............................4-27
Trip Information Button....................................3-57
Trip Odometer................................................3-41
Turn and Lane Change Signals.......................... 3-8
TURN SIGNAL ON.........................................3-76
Turn Signal/Multifunction Lever........................... 3-7
Turn Signals When Towing a Trailer..................4-75
U
Underhood Fuse Block...................................5-113
Understanding Radio Reception.......................3-137
Uniform Tire Quality Grading............................5-76
United States – Customer Assistance.................. 7-4
Used Replacement Wheels..............................5-78
Using Cleaner on Fabric................................5-101
16

Using HomeLink®...........................................2-61
Using Song List Mode...................................3-120
Using the Recovery Hooks...............................4-53
V
Vehicle
Control........................................................ 4-6
Damage Warnings........................................... iv
Loading......................................................4-58
Symbols......................................................... iv
Vehicle Data Collection and Event Data
Recorders.................................................... 7-9
Vehicle Identication
Number (VIN)............................................5-109
Service Parts Identication Label..................5-109
Vehicle Personalization
Memory Seat..............................................2-67
Vehicle Storage..............................................5-44
Video Screen................................................3-125
Visors...........................................................2-18
Voltmeter Gage..............................................3-44
W
Warning Lights, Gages and Indicators................3-39
Warnings
DIC Warnings and Messages........................3-68
Hazard Warning Flashers............................... 3-6Warnings (cont.)
Other Warning Devices.................................. 3-6
Safety and Symbols......................................... iii
Vehicle Damage.............................................. iv
Washing Your Vehicle....................................5-104
Weight Distributing Hitches and Weight
Carrying Hitches..........................................4-72
Weight of the Trailer........................................4-68
Weight of the Trailer Tongue.............................4-71
What Kind of Engine Oil to Use........................5-18
What to Add..................................................5-42
What to Do with Used Oil................................5-21
What to Use..................................5-27, 5-39, 5-51
Wheels
Alignment and Tire Balance..........................5-77
Replacement...............................................5-77
When to Add Engine Oil..................................5-18
When to Change Engine Oil
(GM Oil Life System)...................................5-20
When to Check Lubricant.................................5-51
When to Check Power Steering Fluid................5-38
When to Inspect.............................................5-22
When You Are Ready to Leave After
Parking on a Hill.........................................4-77
Where to Put the Restraint...............................1-57
Why Safety Belts Work....................................1-27
Windows.......................................................2-16
Manual......................................................2-16
17