2004 GMC ENVOY check engine

Owner Checks and Services
These owner checks and services should be performed
at the intervals specied to help ensure the safety,
dependability and emission control performance of your
vehicle. Your GM Goodwrench dealer can assist you
with these checks and services.
Be sure any necessary repairs are completed at once.
Whenever any uids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
inRecommended Fluids and Lubricants on page 6-12.
At Each Fuel Fill
It is important to perform these underhood checks at
each fuel ll.
Engine Oil Level Check
Check the engine oil level and add the proper oil if
necessary. SeeEngine Oil on page 5-16for further
details.
Notice:It is important to check your oil regularly
and keep it at the proper level. Failure to keep your
engine oil at the proper level can cause damage
to your engine not covered by your warranty.
Engine Coolant Level Check
Check the engine coolant level and add
DEX-COOL®coolant mixture if necessary. SeeEngine
Coolant on page 5-25for further details.
Windshield Washer Fluid Level Check
Check the windshield washer uid level in the windshield
washer tank and add the proper uid if necessary.
At Least Once a Month
Tire Ination Check
Visually inspect your tires and make sure tires are
inated to the correct pressures. Do not forget to check
your spare tire. SeeTires on page 5-57for further
details. Check to make sure the spare tire is stored
securely. Push, pull and then try to rotate or turn
the spare tire. If it moves, tighten it. SeeChanging a
Flat Tire on page 5-76.
6-9

At Least Once a Year
Starter Switch Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle.
2. Firmly apply both the parking brake and the regular
brake. SeeParking Brake on page 2-30if
necessary.
Do not use the accelerator pedal, and be ready to
turn off the engine immediately if it starts.
3. Try to start the engine in each gear. The starter
should work only in PARK (P) or NEUTRAL (N).
If the starter works in any other position, contact
your GM Goodwrench dealer for service.
Automatic Transmission Shift Lock
Control System Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle. It should be parked on a level
surface.
2. Firmly apply the parking brake. SeeParking Brake
on page 2-30if necessary.
Be ready to apply the regular brake immediately if
the vehicle begins to move.
3. With the engine off, turn the key to the RUN
position, but do not start the engine. Without
applying the regular brake, try to move the shift
lever out of PARK (P) with normal effort. If the
shift lever moves out of PARK (P), contact your
GM Goodwrench dealer for service.
6-10

Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition key to LOCK in each shift lever position.
The key should turn to LOCK only when the
shift lever is in PARK (P).
The key should come out only in LOCK.
Contact your GM Goodwrench dealer if service is
required.
Parking Brake and Automatic
Transmission Park (P) Mechanism Check
{CAUTION:
When you are doing this check, your vehicle
could begin to move. You or others could be
injured and property could be damaged. Make
sure there is room in front of your vehicle in
case it begins to roll. Be ready to apply the
regular brake at once should the vehicle begin
to move.Park on a fairly steep hill, with the vehicle facing
downhill. Keeping your foot on the regular brake, set the
parking brake.
To check the parking brake’s holding ability: With
the engine running and transmission in
NEUTRAL (N), slowly remove foot pressure from
the regular brake pedal. Do this until the vehicle is
held by the parking brake only.
To check the PARK (P) mechanism’s holding ability:
With the engine running, shift to PARK (P). Then
release the parking brake followed by the regular
brake.
Contact your GM Goodwrench dealer if service is
required.
Underbody Flushing Service
At least every spring, use plain water to ush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
6-11

Vehicle Data Collection and Event
Data Records
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 airbag 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 Airbag 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, seat belt usage, airbag readiness, airbag
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.To read this information, special equipment is needed
and access to the vehicle or the SDM is required.
GM will not access information about a crash event or
share it with others other thanwith the consent of the vehicle owner or, if the
vehicle is leased, with the consent of the lessee,
in response to an official request of police or similar
government office,
as part of GM’s defense of litigation through the
discovery process, or
as required by law.
In addition, once GM collects or receives data, GM may
use the data for GM research needs,
make it available for research where appropriate
condentiality is to be maintained and need is
shown, or
share summary data which is not tied to a specic
vehicle with non-GM organizations for research
purposes.
Others, such as law enforcement, may have access to
the special equipment that can read the information
if they have access to the vehicle or SDM.
If your vehicle is equipped with OnStar, please check
the OnStar subscription service agreement or manual for
information on its operations and data collection.
7-10

Care of (cont.)
Cargo Cover..................................................2-50
Cargo Tie Downs............................................2-51
Cassette Tape Messages.................................3-86
CD Adapter Kits.............................................3-86
CD Messages...............................3-75, 3-89, 3-102
Chains, Tires..................................................5-72
Charging System Light....................................3-36
Check
Engine Light...............................................3-40
Gages Warning Light...................................3-47
CHECK WASHER FLUID.................................3-61
Checking Brake Fluid......................................5-40
Checking Coolant............................................5-26
Checking Engine Oil........................................5-16
Checking Things Under the Hood......................5-10
Checking Your Restraint Systems......................1-61
Chemical Paint Spotting...................................5-98
Child Restraints
Child Restraint Systems...............................1-35
Infants and Young Children...........................1-31
Lower Anchorages and Top Tethers
for Children (LATCH System).....................1-42
Older Children.............................................1-29
Securing a Child Restraint Designed
for the LATCH System..............................1-44
Securing a Child Restraint in a
Rear Outside Seat Position........................1-44Child Restraints (cont.)
Securing a Child Restraint in the
Center Seat Position.................................1-48
Securing a Child Restraint in the
Right Front Seat Position..........................1-48
Top Strap...................................................1-39
Top Strap Anchor Location............................1-41
Where to Put the Restraint...........................1-39
Chime Level Adjustment.................................3-120
Cigarette Lighter.............................................3-20
Cleaning
Inside of Your Vehicle..................................5-92
Outside of Your Vehicle................................5-95
Underbody Maintenance...............................5-98
Video Screen............................................3-119
Weatherstrips..............................................5-94
Cleaning Aluminum Wheels..............................5-97
Cleaning Exterior Lamps/Lenses.......................5-95
Cleaning Fabric/Carpet....................................5-92
Cleaning Glass Surfaces..................................5-94
Cleaning Interior Plastic Components.................5-94
Cleaning Leather............................................5-93
Cleaning the Top of the Instrument Panel...........5-94
Cleaning the Windshield, Backglass
and Wiper Blades........................................5-96
Cleaning Tires................................................5-97
Cleaning Vinyl................................................5-93
3

Driver
Position, Safety Belt.....................................1-14
DRIVER DOOR AJAR.....................................3-61
Driver Information Center (DIC).........................3-50
DIC Operation and Displays..........................3-50
DIC Warnings and Messages........................3-59
Driving
At Night.....................................................4-28
City...........................................................4-33
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-34
Hill and Mountain Roads..............................4-36
In Rain and on Wet Roads...........................4-30
Winter........................................................4-38
Driving Across an Incline..................................4-24
Driving Downhill..............................................4-23
Driving in Mud, Sand, Snow or Ice....................4-26
Driving in Water..............................................4-27
Driving On Grades..........................................4-63
Driving on Off-Road Hills.................................4-19
Driving on Snow or Ice....................................4-39
Driving Through Deep Standing Water...............4-32
Driving Through Flowing Water.........................4-32
Driving Uphill..................................................4-20
Driving with a Trailer.......................................4-61Dual Automatic Climate Control System.............3-24
Dual Climate Control System............................3-20
DVD
Cleaning the Video Screen..........................3-119
Distortion..................................................3-117
Rear Seat Entertainment System..................3-104
DVD Player..................................................3-104
E
Electrical System
Add-On Equipment.....................................5-100
Fuses and Circuit Breakers.........................5-101
Headlamps...............................................5-100
Power Windows and Other Power Options....5-101
Windshield Wiper Fuses.............................5-101
Electronically Controlled Air Suspension System....4-53
Emergency Release for Opening Liftgate............2-14
Emissions Inspection and
Maintenance Programs.................................3-43
Engine
Air Cleaner/Filter.........................................5-21
Battery.......................................................5-42
Change Engine Oil Light...............................3-45
Check and Service Engine Soon Light............3-40
Coolant......................................................5-25
5

Fuel (cont.)
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-6
Gage.........................................................3-48
Gasoline Octane........................................... 5-4
Gasoline Specications.................................. 5-5
Low Warning Light.......................................3-49
Fuel Information..............................................3-52
FUEL LEVEL LOW.........................................3-61
Fuses
Fuses and Circuit Breakers.........................5-101
Windshield Wiper.......................................5-101
G
Gage
Check Gages Warning Light..........................3-47
Engine Coolant Temperature.........................3-39
Fuel..........................................................3-48
Oil Pressure...............................................3-44
Speedometer..............................................3-34
Tachometer.................................................3-35
Voltmeter Gage...........................................3-37
Garage Door Opener.......................................2-41
Gasoline
Octane........................................................ 5-4
Specications............................................... 5-5Gate Ajar Light...............................................3-48
Gate Operator and Canadian Programming........2-44
Getting Familiar with Off-Road Driving................4-18
Glove Box.....................................................2-45
GM Mobility Program for Persons with
Disabilities.................................................... 7-5
H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-5
Headlamp High/Low-Beam Changer.................... 3-9
Headlamp Washer..........................................3-11
Headlamps....................................................5-52
Bulb Replacement.......................................5-52
Electrical System.......................................5-100
Front Turn Signal and Sidemarker Lamps.......5-52
Halogen Bulbs............................................5-52
Headphones.................................................3-110
Heated Seats................................................... 1-3
Highway Hypnosis...........................................4-36
Hill and Mountain Roads..................................4-36
Hitches..........................................................4-59
HomeLink
®Transmitter....................................2-41
HomeLink®Transmitter, Programming................2-42
Hood
Checking Things Under................................5-10
Release.....................................................5-10
7

Horn............................................................... 3-7
How to Add Coolant to the
Coolant Recovery Tank................................5-32
How to Add Coolant to the Radiator..................5-34
How to Add Fluid............................................5-25
How to Check........................................5-23, 5-66
How to Check Lubricant...................................5-49
How to Check Power Steering Fluid..................5-37
How to Inspect...............................................5-22
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-14
Hydroplaning..................................................4-31
I
ICE POSSIBLE..............................................3-61
If No Steam Is Coming From Your Engine..........5-29
If Steam Is Coming From Your Engine...............5-28
If the Light Is Flashing.....................................3-41
If the Light Is On Steady.................................3-42
If You Are Caught in a Blizzard.........................4-40
If You Are Stuck in Sand, Mud, Ice or Snow.......4-42
If You Do Decide To Pull A Trailer.....................4-56
Ignition Positions.............................................2-20
Infants and Young Children, Restraints...............1-31
Ination - Tire Pressure...................................5-65Instrument Panel
Cluster.......................................................3-33
Overview..................................................... 3-4
Instrument Panel Brightness.............................3-17
Interior Lamps................................................3-17
J
Jump Starting.................................................5-43
K
Keyless Entry System....................................... 2-5
Keys............................................................... 2-3
L
Lamps
Exterior......................................................3-15
Interior.......................................................3-17
Lamps On Reminder.......................................3-16
Lap-Shoulder Belt...................................1-14, 1-23
LATCH System
Child Restraints...........................................1-42
Securing a Child Restraint Designed for the
LATCH System........................................1-44
8