Question about 2003 Hummer H2

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My hummer h2 03 is not gettig start it shows big lock in the dash. some one told me its security lock?

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  • sagarbekal Apr 29, 2009

    we have the same problem here in india.... but as the car has been converted from the Left hand drive to a Right hand driven Car, the sensor from the Car key has been removed... but still this problem exists... Can someone help me fix this issue??

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    Have you tried your spare key? The security system is not recognizing the key you are using.

    Let me know.


  • Anonymous Mar 26, 2014

    my selectable rear diff lock is locked in all the time even though the button on the dash is not light up



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  • 319 Answers

The security transmitter in the key could be bad, or the passlock system is bad. try taking it to a GM dealer, so they can reprogram the system

Posted on Feb 27, 2009


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Hummer H3 Antitheft. How do I reset it

This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into.

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Try charging the battery a bit by snaking the positive jumper cable underneath to the starter post where the big cable connects, and the negative jumper cable to a good ground on the frame.

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Starter not working with remote

The remote start isn't compatible with your hummer. The factory security system isn't able to allow a remote starter to work with it , just the way it was designed for security. You can bypass it with a adaptor but you would have to disable your security system. Most professionals won't do that, you can fin a back yard machanic to assist you. But then it affects your insurance rates now that your security system is no longer working. If you can spend the big bucks some professionals can get the viper brand of remote start to work on hummers. I've experienced this with a 07 H3 tried an inexpensive aftermarket starter it worked twice on the 3rd time it would then make my hummer go into anti-theft mode and wouldn't start engine for 10 min, the lights would work on inside it would turn over when I turned the key but it wouldn't start. I took it back to the company that installed it they woul reset it and it woul happen all over again. So I then went to a different company explained situation they again reprogrammed it and told me the last people were setting it with the driver door open so it wasn't going to start without the door open. This time the remote start only worked once then the 2nd try would go into anti-theft mode making me wait 10 min before it would start the engine. I couldn't spend the $ to try a viper brand an they charge you to uninstall them so I have since sold it and just kept the key fobs so the next owners wouldn't have the same trouble. The second company did suggest trying a relay system to see if that would solve the issue but I didn't get a chance to try it, so maybe mention trying the relay system with your currant starter before paying for a expensive system.

Jan 27, 2014 | 2006 Hummer H3

1 Answer

Theft lock

You can't. You need to see the dealer to have the system scanned for faults.

Nov 15, 2012 | 2005 Hummer H2 SUT

1 Answer

When, a key lock sing blinks on the dash of hummer H3, and will not start, what can i do ?

make sure all windows are closed
get out of the Hummer, using the central lock, lock the 4 doors
close the door
then open it with the KEY
then try to Start the Hummer.
(repeat several times till it works)
I am facing this problem now and that is the only soluttion I found. Untill i buy a new remote key that got stolen :S

In order not to fall in this problem, avoid opening the hummer with the key and directly locking the four doors using the central lock before starting it.

Sep 04, 2010 | 2006 Hummer H3

2 Answers

Why does my hummer <h3> start without the

Hummers (all models) use programmable "Remote Keyless Entry" transmitters, not simply lock/unlock units.
For example, you can program the unit to make the horn "sound off" (or not) when you press the lock button once, as a confirmation that the vehicle is secure. Programming the transmitter is somewhat tricky; however, the instructions are fully documented in the owners' manual.
Since you asked "why ... ?" and not "how ...?", please consult your manual for instructions on programming your keyless remote.

Programming is tricky: inserting key in ignition, holding the lock button down for 30 seconds, then turning the key off/on and then releasing the lock button ... sheesh! .. It is beyond description.

Jan 13, 2010 | 2006 Hummer H3

1 Answer

2005 Hummer H2 battery went down and when I replaced it the alarm keeps going off and it will not start.

if it is the factory alarm you will have to do a relearn. G.M. uses a couple different ways to do the relearn and I would think it would be the same for hummer. turn off all acc and then turn the key to the on position wait 10 minutes you will see the light on the dash flash and go out . asap turn the key to off to on 3 times quickly and the third time leave it on on again do this 3 times for 30 minutes then after the final turning of the key 3 times on the 4th time start the car. so turn off all acc like radio , a/c ect then turn key to on in 10 minutes the light on dash will flash and go out quickly turn key from off to on 3 times and once again leave on on do that 3x for 30 minutes then start the car. that is the gm relearn for security they have one on some models that start after 10 minutes but that is usualy on the cheaper cars so just do the 30 minute.

Jun 04, 2009 | 2006 Hummer H3

1 Answer

Hummer H2 SUT DTC Code C0563

u need to change/service the air compressor in ur car.
or it might be the air bags/sensors thats located next to the rear tires.

May 29, 2009 | 2005 Hummer H2

1 Answer

Hummer H2 SUT DTC Code C0563

C0563 - Calibration ROM Checksum Error
Not sure what it means but thats what I found when I looked it up

Oct 27, 2008 | 2005 Hummer H2

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