check engine light HUMMER H3 2007 User Guide

REDUCED POWER
This message displays when the vehicle’s engine
power is reduced. Reduced engine power can
affect the vehicle’s ability to accelerate. If this
message is on, but there is no reduction in
performance, proceed to your destination. The
performance may be reduced the next time the
vehicle is driven. The vehicle may be driven at a
reduced speed while this message is on, but
acceleration and speed may be reduced. Anytime
this message stays on, the vehicle should be taken
to your dealer for service as soon as possible.
Press and release the reset stem to acknowledge
the message and clear it from the display.
SERV (Service) 4WD
(Four-Wheel Drive)
This message displays when there is a problem
with the transfer case control system. Check
the transfer case on your vehicle and have
it serviced by your dealer. SeeFull-Time
Four-Wheel Drive on page 111for more
information about the transfer case. Press and
release the reset stem to acknowledge the
message and clear it from the display.
SERV (Service) TPM
(Tire Pressure Monitor)
This message displays if any of the tire monitor
sensors have malfunctioned, if the tire monitor
sensors have not been programmed, or if
the recommended tire pressures are not
programmed. The tire pressure light also ashes
for one minute and then turns on solid until
the condition goes away or the system is serviced.
SeeTire Pressure Light on page 185. Press
and release the reset stem to acknowledge the
message and clear it from the display. This
message appears at each ignition cycle until the
system is serviced. See your dealer for service.
SeeTire Pressure Monitor System on page 376
for more information.
SERV (Service) VEH (Vehicle)
This message displays if your vehicle needs
service. Have your vehicle serviced by your dealer
as soon as possible.
199

Avoid needless heavy braking. Some people drive
in spurts — heavy acceleration followed by heavy
braking — rather than keeping pace with traffic.
This is a mistake. The brakes may not have time to
cool between hard stops. The brakes will wear out
much faster if you do a lot of heavy braking. If you
keep pace with the traffic and allow realistic
following distances, you will eliminate a lot of
unnecessary braking. That means better braking
and longer brake life.
If your vehicle ever loses electrical power while you
are driving, brake normally but do not pump the
brakes. If you do, the pedal may get harder to push
down. If your vehicle loses electrical power, you will
still have some power brake assist. But you will use
it when you brake. Once the power assist is used
up, it may take longer to stop, the brake pedal will
be harder to push, and you may experience longer
pedal travel.
Adding non-GM accessories can affect your
vehicle’s performance. SeeAccessories and
Modications on page 314Anti-Lock Brake System (ABS)
Your vehicle has the Anti-Lock Brake
System (ABS), an advanced electronic braking
system that will help prevent a braking skid.
When you start your engine and begin to drive
away, ABS will check itself. You may hear a
momentary motor or clicking noise while this
test is going on. This is normal.
If there is a problem
with ABS, this warning
light will stay on.
SeeAnti-Lock Brake
System Warning
Light on page 183.
239

Once you are moving on the freeway, make
certain you allow a reasonable following distance.
Expect to move slightly slower at night.
When you want to leave the freeway, move to
the proper lane well in advance. If you miss
your exit, do not, under any circumstances, stop
and back up. Drive on to the next exit.
The exit ramp can be curved, sometimes quite
sharply. The exit speed is usually posted.
Reduce your speed according to your
speedometer, not to your sense of motion.
After driving for any distance at higher speeds,
you may tend to think you are going slower
than you actually are.
Before Leaving on a Long Trip
Make sure you are ready. Try to be well rested.
If you must start when you are not fresh — such
as after a day’s work — do not plan to make
too many miles that rst part of the journey.
Wear comfortable clothing and shoes you can
easily drive in.Is your vehicle ready for a long trip? If you keep it
serviced and maintained, it is ready to go. If it needs
service, have it done before starting out. Of course,
you will nd experienced and able service experts
in GM dealerships all across North America. They
will be ready and willing to help if you need it.
Here are some things you can check before a trip:
Windshield Washer Fluid:Is the reservoir
full? Are all windows clean inside and outside?
Wiper Blades:Are they in good shape?
Fuel, Engine Oil, Other Fluids:Have you
checked all levels?
Lamps:Are they all working? Are the lenses
clean?
Tires:They are vitally important to a safe,
trouble-free trip. Is the tread good enough
for long-distance driving? Are the tires
all inated to the recommended pressure?
Weather Forecasts:What is the weather
outlook along your route? Should you
delay your trip a short time to avoid a major
storm system?
Maps:Do you have up-to-date maps?
278

{CAUTION:
Snow can trap exhaust gases under your
vehicle. This can cause deadly CO (carbon
monoxide) gas to get inside. CO could
overcome you and kill you. You cannot see
it or smell it, so you might not know it is in
your vehicle. Clear away snow from around
the base of your vehicle, especially any
that is blocking your exhaust pipe. And
check around again from time to time to
be sure snow does not collect there.
Open a window just a little on the side of
the vehicle that is away from the wind.
This will help keep CO out.Run your engine only as long as you must.
This saves fuel. When you run the engine, make it
go a little faster than just idle. That is, push the
accelerator slightly. This uses less fuel for the heat
that you get and it keeps the battery charged.
You will need a well-charged battery to restart the
vehicle, and possibly for signaling later on with
your headlamps. Let the heater run for a while.
Then, shut the engine off and close the window
almost all the way to preserve the heat. Start
the engine again and repeat this only when you
feel really uncomfortable from the cold. But do it
as little as possible. Preserve the fuel as long
as you can. To help keep warm, you can get out
of the vehicle and do some fairly vigorous
exercises every half hour or so until help comes.
285

Maintenance When Trailer Towing
Your vehicle will need service more often when
you’re pulling a trailer. See the Maintenance
Schedule for more on this. Things that are
especially important in trailer operation are
automatic transmission uid, engine oil, axle
lubricant, belts, cooling system and brake
system. Each of these is covered in this manual,
and the Index will help you nd them quickly.
If you’re trailering, it’s a good idea to review
these sections before you start your trip.
Check periodically to see that all hitch nuts
and bolts are tight.
Trailer Wiring Harness
Light-Duty Trailer Wiring Package
If your vehicle is not equipped with a trailer
towing package, the chassis harness will
contain the following blunt cut circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
White: Ground
Brown: Tail Lamps
If you want to add on a trailer tow, it should be
installed by your dealer or a qualied service
center. Also, seeAdd-On Electrical Equipment
on page 416for more information.
307

How to Check and Add Fluid
The proper uid should be added if the level does
not reach the bottom of the diaphragm when it
is in place in the reservoir. See the instructions on
the reservoir cap.
Engine Coolant
The cooling system in your vehicle is lled with
DEX-COOL®engine coolant. This coolant is
designed to remain in your vehicle for ve years or
150,000 miles (240 000 km), whichever occurs
rst, if you add only DEX-COOL
®extended
life coolant.
The following explains your cooling system and
how to add coolant when it is low. If you have
a problem with engine overheating, seeEngine
Overheating on page 338.A 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant will:
Give freezing protection down to−34°F (−37°C).
Give boiling protection up to 265°F (129°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as
they should.
Notice:Using coolant other than DEX-COOL
®
may cause premature engine, heater core,
or radiator corrosion. In addition, the engine
coolant may require changing sooner, at
the rst maintenance service after each
30,000 miles (50 000 km) or 24 months,
whichever occurs rst. Any repairs would not
be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your
vehicle.
335

Capacities and Specications...................... 422
Carbon Monoxide............... 95,120, 281, 297
Care of
Safety Belts............................................. 409
Your CD Player........................................ 232
Your CDs ................................................. 231
Cargo Cover............................................... 146
Cargo Tie Downs........................................ 146
CD, MP3 ..................................................... 222
Chains, Tire................................................. 389
Check
Engine Light............................................ 186
Checking Things Under the Hood................ 321
Chemical Paint Spotting.............................. 414
Child Restraints
Child Restraint Systems............................. 45
Infants and Young Children........................ 42
Lower Anchors and Tethers for Children..... 51
Older Children........................................... 39
Securing a Child Restraint in a
Rear Outside Seat Position.................... 57
Securing a Child Restraint in the
Center Rear Seat Position...................... 60
Securing a Child Restraint in the
Right Front Seat Position........................ 60
Where to Put the Restraint........................ 49
Cigarette Lighter.......................................... 170Cleaning
Aluminum or Chrome-Plated Wheels........ 412
Exterior Lamps/Lenses............................. 410
Fabric/Carpet........................................... 407
Finish Care.............................................. 410
Inside of Your Vehicle .............................. 406
Instrument Panel, Vinyl, and Other
Plastic Surfaces.................................... 409
Leather.................................................... 408
Tires........................................................ 413
Underbody Maintenance........................... 413
Washing Your Vehicle .............................. 410
Weatherstrips........................................... 409
Windshield, Backglass, and
Wiper Blades........................................ 411
Climate Control System............................... 170
Outlet Adjustment..................................... 173
Clutch, Hydraulic......................................... 334
Collision Damage Repair............................. 460
Comfort Guides, Rear Safety Belt................. 35
Compass............................................122, 125
Content Theft-Deterrent................................. 98
Control of a Vehicle..................................... 238
Convenience Net......................................... 146
Coolant
Engine Temperature Gage........................ 185
Heater, Engine......................................... 105
469

E
Electric Power Management........................ 168
Electrical System
Add-On Equipment................................... 416
Engine Compartment Fuse Block............. 418
Fuses and Circuit Breakers...................... 417
Power Windows and Other Power
Options................................................. 417
Windshield Wiper Fuses........................... 417
Engine
Air Cleaner/Filter...................................... 328
Battery..................................................... 351
Check and Service Engine Soon Light..... 186
Coolant.................................................... 335
Coolant Heater......................................... 105
Coolant Temperature Gage...................... 185
Drive Belt Routing.................................... 443
Engine Compartment Overview................ 322
Exhaust................................................... 120
Fan Noise................................................ 345
Oil ........................................................... 323
Oil Life System........................................ 326
Overheating............................................. 338
Starting.................................................... 103
Event Data Recorders (EDR)...................... 458Exit Lighting................................................ 168
Extender, Safety Belt..................................... 38
Exterior Lamps............................................ 162
F
Filter
Engine Air Cleaner................................... 328
Finish Damage............................................ 413
Fixed Mast Antenna.................................... 232
Flashers, Hazard Warning........................... 154
Flash-to-Pass.............................................. 157
Flat Tire...................................................... 390
Flat Tire, Changing...................................... 391
Flat Tire, Storing......................................... 403
Fluid
Automatic Transmission............................ 329
Manual Transmission................................ 332
Power Steering........................................ 345
Windshield Washer.................................. 346
Fog Lamps.................................................. 167
Four-Wheel Drive........................................ 358
Four-Wheel Drive, Full-Time........................ 111
Front Armrest Storage Area......................... 143
Front Axle................................................... 358
Front Seat Storage Net............................... 143
471

Fuel............................................................ 316
Additives.................................................. 317
California Fuel.......................................... 316
Filling a Portable Fuel Container.............. 320
Filling Your Tank...................................... 318
Fuels in Foreign Countries....................... 318
Gage....................................................... 191
Gasoline Octane...................................... 316
Gasoline Specications............................ 316
Fuses
Engine Compartment Fuse Block............. 418
Fuses and Circuit Breakers...................... 417
Windshield Wiper..................................... 417
G
Gage
Engine Coolant Temperature.................... 185
Fuel......................................................... 191
Speedometer........................................... 176
Tachometer.............................................. 176
Garage Door Opener..........................132, 133
Gasoline
Octane..................................................... 316
Specications........................................... 316Glove Box................................................... 143
GM Mobility Reimbursement Program.......... 453
H
Hazard Warning Flashers............................ 154
Head Restraints............................................ 13
Headlamp
Aiming..................................................... 358
Headlamps.................................................. 362
Automatic Headlamp System.................... 165
Bulb Replacement.................................... 361
Daytime Running Lamps.......................... 164
Flash-to-Pass........................................... 157
Halogen Bulbs......................................... 361
High/Low Beam Changer ......................... 157
On Reminder........................................... 164
Heated Seats................................................ 10
Heater......................................................... 170
Highbeam On Light..................................... 190
Highway Hypnosis....................................... 279
Hill and Mountain Roads............................. 279
Hood
Checking Things Under............................ 321
Release................................................... 321
472

MP3 ............................................................ 222
MyGMLink.com............................................ 451
N
Navigation/Radio System,
see Navigation Manual............................. 230
New Vehicle Break-In.................................. 101
Normal Maintenance Replacement Parts....... 442
O
Odometer.................................................... 176
Odometer, Trip............................................ 176
Off-Road Driving.......................................... 250
Off-Road Lamps.......................................... 166
Off-Road Recovery...................................... 247
Oil
Engine..................................................... 323
Pressure Light.......................................... 189
Oil, Engine Oil Life System......................... 326
Older Children, Restraints............................. 39
Online Owner Center................................... 451
OnStar
®System, see OnStar®Manual........ 129
Other Warning Devices................................ 154
Outlet Adjustment........................................ 173
Outlet(s), Accessory Power.......................... 169Outside
Convex Mirror.......................................... 128
Power Mirrors.......................................... 128
Owner Checks and Services....................... 435
Owners, Canadian.......................................... 3
P
Paint, Damage............................................ 413
Park (P)
Shifting Into............................................. 117
Shifting Out of......................................... 119
Parking
Brake....................................................... 116
Over Things That Burn............................ 119
Parking Your Vehicle................................... 119
Passenger Airbag Status Indicator............... 179
Passenger Sensing System........................... 75
Passing....................................................... 247
Passlock
®.................................................... 100
Power
Accessory Outlet(s).................................. 169
Door Locks................................................ 93
Electrical System..................................... 417
Lumbar Controls.......................................... 9
Retained Accessory (RAP)....................... 103
Seat............................................................ 9
475