2007 HUMMER H2 light

If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully
install the cap. SeeFilling the Tank on page 397.
The diagnostic system can determine if the
fuel cap has been left off or improperly installed.
A loose or missing fuel cap will allow fuel to
evaporate into the atmosphere. A few driving trips
with the cap properly installed should turn the
light off.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The
condition will usually be corrected when the
electrical system dries out. A few driving trips
should turn the light off.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 394. Poor fuel
quality will cause your engine not to run as
efficiently as designed. You may notice this as
stalling after start-up, stalling when you put
the vehicle into gear, misring, hesitation on
acceleration, or stumbling on acceleration. (These
conditions may go away once the engine is
warmed up.) This will be detected by the system
and cause the light to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at
least one full tank of the proper fuel to turn the
light off.
If none of the above steps have made the light
turn off, your dealer can check the vehicle.
Your dealer has the proper test equipment and
diagnostic tools to x any mechanical or electrical
problems that may have developed.
217

Emissions Inspection and Maintenance
Programs
Some state/provincial and local governments have
or may begin programs to inspect the emission
control equipment on your vehicle. Failure to pass
this inspection could prevent you from getting a
vehicle registration.
Here are some things you need to know to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the
check engine light is on or not working properly.
Your vehicle will not pass this inspection if
the OBD (on-board diagnostic) system determines
that critical emission control systems have not
been completely diagnosed by the system.
The vehicle would be considered not ready for
inspection. This can happen if you have recently
replaced your battery or if your battery has
run down. The diagnostic system is designed to
evaluate critical emission control systems
during normal driving. This may take several days
of routine driving. If you have done this and
your vehicle still does not pass the inspection for
lack of OBD system readiness, your dealer
can prepare the vehicle for inspection.
Oil Pressure Gage
The oil pressure gage shows the engine oil
pressure in psi (pounds per square inch) when the
engine is running. Canadian vehicles indicate
pressure in kPa (kilopascals).
Oil pressure may vary with engine speed, outside
temperature and oil viscosity, but readings
above the low pressure zone indicate the normal
operating range.
United StatesCanada
218

A reading in the low pressure zone may be
caused by a dangerously low oil level or some
other problem causing low oil pressure. Check
your oil as soon as possible. SeeEngine Oil on
page 404.
{CAUTION:
Do not keep driving if the oil pressure is
low. If you do, your engine can become so
hot that it catches re. You or others could
be burned. Check your oil as soon as
possible and have your vehicle serviced.
Notice:Lack of proper engine oil maintenance
may damage the engine. The repairs would
not be covered by your warranty. Always follow
the maintenance schedule in this manual for
changing engine oil.
Security Light
This light will come on
briey when you turn
the key toward START.
The light will stay on
until the engine starts.
If the light ashes, the Passlock
®system has
entered a tamper mode. If the vehicle fails to start,
seePasslock
®on page 118.
If the light comes on continuously while driving
and stays on, there may be a problem with
the Passlock
®system. Your vehicle will not be
protected by Passlock®, and you should see your
dealer.
Also, seeContent Theft-Deterrent on page 116for
additional information regarding the security light.
219

Cruise Control Light
The cruise light comes
on whenever you set
your cruise control. See
“Cruise Control”
underTurn
Signal/Multifunction
Lever on page 178.
Highbeam On Light
This light comes on
when the high-beam
headlamps are in use.
SeeHeadlamp High/Low-Beam Changer on
page 179.
Tow/Haul Mode Light
This light is displayed
when the tow/haul mode
has been activated.
For more information, see “Tow/Haul Mode” under
Towing a Trailer on page 374.
220

Fuel Gage
When the ignition is on, the fuel gage tells you
about how much fuel you have left in your tank.
The gage will rst indicate empty before you
are out of fuel, and you should get more fuel as
soon as possible.Here are some situations you may experience with
your fuel gage. None of these indicate a problem
with the fuel gage.
At the gas station, the fuel pump shuts off
before the gage reads full.
It takes a little more or less fuel to ll up than
the fuel gage indicated. For example, the
gage may have indicated the tank was half full,
but it actually took a little more or less than
half the tank’s capacity to ll the tank.
The gage goes back to empty when you turn
off the ignition.
Low Fuel Warning Light
The light next to the fuel gage will come on briey
when you are starting the engine.
This light comes on and a FUEL LEVEL LOW
message will appear on the Driver Information
Center when the fuel tank is low on fuel. To turn it
off, add fuel to the fuel tank. SeeFuel on
page 394andDIC Warnings and Messages on
page 226for more information.
United StatesCanada
221

DIC Warnings and Messages
Messages are displayed on the DIC to notify the
driver that the status of the vehicle has changed
and that some action may be needed by the driver
to correct the condition. Multiple messages may
appear one after another.
Some messages may not require immediate
action. Press any of the DIC buttons on the
steering wheel or the trip odometer reset stem
located on the instrument panel cluster to
acknowledge that you received the messages and
to clear them from the display.
Some messages cannot be cleared from the
display because they are more urgent. These
messages require action before they can be
removed from the DIC display. Take any messages
that appear on the display seriously and remember
that clearing the messages will only make the
messages disappear, not correct the problem.
The following are the possible messages that can
be displayed and some information about them.
BATTERY NOT CHARGING
This message displays if the battery is not
charging during operation. Driving with this
problem could drain the battery. Have the electrical
system checked as soon as possible by your
dealer. SeeCharging System Light on page 209
andVoltmeter Gage on page 210for more
information. Press any of the DIC buttons, or the
trip stem, to acknowledge this message and
clear it from the DIC display.
CHANGE ENGINE OIL
This message displays when the engine oil needs
to be changed. See “Engine Oil Life System”
underDIC Operation and Displays on page 222
andEngine Oil Life System on page 407for
information on how to reset the message. Also,
seeEngine Oil on page 404for more information.
This message clears itself after 10 seconds
until the next ignition cycle.
226

CHARGING SYSTEM FAILURE
On some vehicles, this message displays, a chime
sounds, and the charging system light on the
instrument panel cluster comes on if there
is a problem with the generator and battery
charging system. SeeCharging System Light on
page 209andVoltmeter Gage on page 210
for more information. Driving with this problem
could drain the battery. Turn off all unnecessary
accessories. Stop and turn off the vehicle as soon
as it is safe to do so. Have the electrical system
checked by your dealer immediately.
CHECK OIL LEVEL
This message displays if the oil level in the vehicle
is low. Check the oil level and correct it as
necessary. You may need to let the vehicle cool
or warm up and cycle the ignition to make sure this
message clears. Once the problem is corrected,
press any of the DIC buttons, or the trip stem,
to acknowledge this message and clear it from the
DIC display. This message clears itself after
10 seconds until the next ignition cycle.
CHECK WASHER FLUID
This message displays if the windshield washer
uid level is low. Adding windshield washer uid to
the windshield washer uid reservoir clears the
message. SeeWindshield Washer Fluid on
page 426for more information. Press any of the
DIC buttons, or the trip stem, to acknowledge
this message and clear it from the DIC display.
This message clears itself after 10 seconds
until the next ignition cycle.
DRIVER DOOR AJAR
This message displays and a chime sounds if the
driver’s door is not fully closed and the vehicle
is in a drive gear. Stop and turn off the vehicle,
check the door for obstructions, and close the door
again. Check to see if the message still appears
on the DIC. Press any of the DIC buttons, or
the trip stem, to acknowledge this message and
clear it from the DIC display.
227

ENGINE COOLANT HOT
This message displays if the cooling system
temperature gets hot. Turn off the air conditioning.
If the message is still on, or if the engine coolant
temperature gage continues to rise, pull the vehicle
over when it is safe to do so. SeeEngine
Coolant Temperature Gage on page 213for more
information. Stop the vehicle and let the engine
idle in PARK (P) for a few minutes to allow
the coolant to reach a safe temperature. This
message clears when the coolant temperature
drops to a safe operating temperature. Press any
of the DIC buttons, or the trip stem, to
acknowledge this message and clear it from the
DIC display.
ENGINE OVERHEATED
This message displays and a chime sounds if the
engine cooling system reaches unsafe
temperatures for operation. Stop and turn off the
vehicle as soon as it is safe to do so to avoid
severe damage. This message clears when the
engine has cooled to a safe operating temperature.
FUEL LEVEL LOW
This message displays and a chime sounds if the
fuel level is low. Refuel as soon as possible.
Press any of the DIC buttons, or the trip stem, to
acknowledge this message and clear it from
the DIC display. This message also clears itself
after 10 seconds. The low fuel light near the
fuel gage still remains on in either case. SeeLow
Fuel Warning Light on page 221,Fuel Gage on
page 221, andFuel on page 394for more
information.
KEYFOB X BATTERY LOW
This message displays if a Remote Keyless
Entry (RKE) transmitter battery is low. Replace
the battery in the transmitter. See “Battery
Replacement” underRemote Keyless Entry (RKE)
System Operation on page 97. Press any of the
DIC buttons, or the trip stem, to acknowledge this
message and clear it from the DIC display.
228