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02-08-2007, 01:03 AM
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Hummer Novice
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Join Date: Jan 2003
Posts: 20
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Re: 03 Check Engine Light Question
Everytime it has happend to me was because the gas cap was not on properly. Take it and have the code read. Then take off the gas cap, put it back on then turn it three full clicks after it stops. Clear the code with the reader and see if that does not solve the problem totally. (If you know anyone who has any sort of OBDII power programmer most all of them will read and clear codes, even if it is not for your model vehicle, I have even used the one from my Duramax to clear codes on the H2)
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02-08-2007, 03:12 AM
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Hummer Guru
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Join Date: Nov 2002
Location: CSA
Posts: 2,511
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From the Owners Manual
Malfunction Indicator Lamp
(Check Engine Light)
Your vehicle is equipped
with a computer which
monitors operation of the
fuel, ignition and emission
control systems.
This system is called OBD II (On -Board
Diagnostics-Second Generation) and is intended
to assure that emissions are at acceptable levels for
the life of the vehicle, helping to produce a cleaner
environment. The CHECK ENGINE light comes on to
indicate that there is a problem and service is required.
Malfunctions often will be indicated by the system
before any problem is apparent. This may prevent more
serious damage to your vehicle. This system is also
designed to assist your service technician in correctly
diagnosing any malfunction.
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
NOTICE:
Modifications made to the engine, transmission,
exhaust, intake or fuel system of your vehicle
or the replacement of the original tires with
other than those of the same Tire Performance
Criteria (TPC) can affect your vehicle?s emission
controls and may cause this light to come on.
Modifications to these systems could lead to
costly repairs not covered by your warranty.
This may also result in a failure to pass a
required Emission Inspection/Maintenance test.
This light should come on, as a check to show you it is
working, when the ignition is on and the engine is not
running. If the light doesn?t come on, have it repaired.
This light will also come on during a malfunction in one
of two ways:
Light Flashing -- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.
Light On Steady -- An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis and
service may be required.
If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:
Reducing vehicle speed.
Avoiding hard accelerations.
Avoiding steep uphill grades.
If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If the light stops flashing and remains on steady,
see ?If the Light Is On Steady? following.
If the light continues to flash, when it is safe to do so,
stop the vehicle . Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart the
engine. If the light remains on steady, see ?If the Light
Is On Steady? following. If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer or qualified service center for service.
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. See ?Filling Your Tank? in the Index.
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.
See ?Fuel? in the Index. 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,
misfiring, 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,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.
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02-08-2007, 05:00 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: 03 Check Engine Light Question
You can buy very inexpensive code readers these days, just bought one from MAC tools for 73.00 can and comes with A book with all the codes and descriptions. Is about the size of A key fob. very handy.
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02-08-2007, 08:02 AM
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Banned
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Join Date: Feb 2007
Posts: 19
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Re: 03 Check Engine Light Question
do you have a link to buy that?^^^
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02-08-2007, 06:30 PM
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Hummer Professional
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Join Date: Jun 2006
Posts: 373
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Re: 03 Check Engine Light Question
I bought a code reader a couple of years back. We were stranded in a small town with my Wife's Chrysler Town & Country, the transmission was in limp mode so we bought a code reader to reset it every so often to make it home.
Turned out to be a bad speed sensor and was fixed no charge out of warranty thanks to Keystone Chrysler.
Since then the code reader has come in handy several times for me, my neighbors, and co-workers. It's certainly paid for itself in diagnostic fees and probably paid for itself in free beers and meals via sharing.
I would not hesitate to buy one, they work on just about every vehicle made in the last 10 years. Shop around, some read codes out on screen in full text, others display a numerical code you have to look up in a book.
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02-08-2007, 07:26 PM
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Hummer Veteran
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Join Date: Feb 2003
Location: Jellico, TN
Posts: 152
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Re: 03 Check Engine Light Question
Thanks for all the help. I had a local mechanic read the codes and it is a catalytic converter problem and engine misfire. The Hummer dealer says that it should be under warranty (8yr/80k). I hope so because I was told it could be from $400 to over $1000 to fix. Thanks for the help!!!
__________________
03 Black Adventure with all Lux Options,Brush Guard Lights, Sylvania Silverstars, I-Pod via PAC Device. Go Vols!!!
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02-08-2007, 08:02 PM
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Hummer Veteran
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Join Date: May 2006
Posts: 241
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Re: 03 Check Engine Light Question
let us know what it was after the dealer is done with it. thanks
__________________
Formerly Saleen779
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