Question about 2003 Hummer H2

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2003 hummer h2 hard to start engine when i try to start engine, it will crank over like normal, but doesn't start. Then i try it again, and it starts, and runs rough for a few seconds, and runs f

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Smith kaveke

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Have hummer h2 can't start shows in the dash in known driver

Posted on Sep 13, 2015


Brandon Johnson

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Possible fuel filter, fuel pump issue. Check out these items and let me know what you find.
I hope this info helps!~subyguru~

Posted on May 15, 2012


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ron collier

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SOURCE: My 2003 H2 engine light flashes but no trouble code.

this is vey common n hummers. this WILL NOT show up on diagnostic check everytime but your cats are fried, if you do not fix this problem fastyou can toast your motor. i got mine from, if yo cant afford them and the hummers your daily driver you can illegally take them off an gut them out and reinstall only to save your motor till you get the cash

Posted on Nov 23, 2011

SOURCE: my 2003 h2 hummer will initally not shift from

Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.

Posted on Jul 17, 2009


  • 7 Answers

SOURCE: Hummer H2 2003 sunroof problem

it will probably be your guidrail. you need to check it first,dont try to force it. it can cause more damage.

Posted on Feb 07, 2009


  • 3 Answers


Had the same problem. i have to re-place my front wiper motor they are all connected.

Posted on Feb 25, 2009


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SOURCE: Hummer H2 engine won't turn over, key won't

Dead Battery? Bad starter motor?

Try pushing on the brake and making sure its all the way in park.

Turn the steering wheel back an forth a little to remove the key.

None of those work, Call triple A, find a shop.

Posted on Aug 22, 2009

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1 Answer

Reset the engine immobilizer on a 2003 hummer h2 the engine turns over but will not start

Have you had the crankcase temp sensor checked. If this sensor fails the motor will not start. Hope this is of help.
John S.

Jan 03, 2015 | 2003 Hummer H2

1 Answer

My Hummer H2 2003 model had a problem starting when its warm. Like when I start it in the morning, its normal, but after driving it for a few minutes and the engine is warm, I had difficulty starting

I had this same problem with my 2003 H2, my mechanic found that the fuel diaphragm was cracked and this was allowing my truck to flood. If it was a cold start, the extra fuel would evaporate and it would start fine. It actually got to the point where I would stall at a stop light or stop sign at idle. The part was is the neighborhood of $175.00 and about 1 hour of labor to install.

Mar 29, 2013 | 2003 Hummer H2

1 Answer

Wife came home in h2 hummer 2003 parked,30 mins.,went to make store run and hummer turns over but does not crank;.has fuel! i checked pcm b module fuse,fuel pump relay (f/pmp) . I put an OBD to check...

Hello Stacy, My name is Mike. I am thrilled that you choose me to help you with your problem. I am sorry, it took me a few hours to get back to you. I have been helping other customers. Here is where I am with this on your cranking and not starting issue. Oh, by the way great job on your part eliminating some of the other potential suspects.

First of all, I try and tackle the easiest things first,to see if we get lucky.

Pull the start/run relay out for a couple minutes, then put it back in and reset it might reset the passlock box and start right up.

Now, why did I say that? I believe your problem is with your Passlock indicator.( which has to do with your anti theft system)The way I just described is a 50/50 chance to have it work, but don't worry. I always have a plan B and C.

Here is some questions to your symptoms: Stay with me now, wait for it.

Perform the re-learning procedure

Turn ON the ignition, with the engine OFF.

Attempt to start the engine, then release the key to ON (vehicle will not start).

Observe the SECURITY light, after approximately 11 minutes the light will turn OFF.

Turn OFF the ignition, and wait 10 seconds.

Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( the vehicle

is now ready to relearn the Sensor Data Code and/or passwords on the next ignition switch transition from OFF

to CRANK).

Important: The vehicle learns the relearns Sensor Data Code and/or password on the next ignition switch

transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

Start the engine (the vehicle has now learned the Sensor Data Code and/or password).

Here is Plan C as promised, but I personally would not suggest, Even though GMC offers a bypass procedure.

Link for a Bypass Solution:

Plan D, would be have to check into possibility of bad ECM, but lets hope that is just a worst case scenario.

Thanks So Much,Mike. Please Keep Me Informed of progress.

Sep 28, 2011 | 2003 Hummer H2

1 Answer

My hummer has hard start when it's turned off for ashort period,

A scan tool should be able to read the temp pids at operating temperature to see if they are "off" enough to cause problems . Check for fuel lines to close to heat sources as boiling of the fuel causing vapor lock may be happening after heat soaking .

Aug 16, 2017 | 2003 Hummer H2

1 Answer

My 2003 hummer has a ''hard start'' it takes about 6 seconds for the engine to turn over. I did a full tune up on it, wire, plugs etc, but no luck, what do you think?

If you mean that the engine cranks over for 6 seconds before it fires up, that sounds like a fuel situation. You would need to install a fuel pressure gauge and turn the engine off for several minutes and see if pressure drops. The pump has a check valve that keeps the fuel line pressurized until you start the engine again, if that valve is bleeding off pressure it takes longer for the pump to prime the fuel system, hence your long crank. Could also be a regulator or fuel injector bleeding pressure. Good luck!

Apr 18, 2010 | 2003 Hummer H2

2 Answers

My 2003 h2 died this morning while driving. All

disconnect harness to the pump and jump with test light, turn key on and the light should go on for a few seconds

Nov 28, 2009 | 2003 Hummer H2

1 Answer

Hummer want start

What have you done so far? Is it a crank/ no start or a no crank? Do you have any active engine codes? Was it in the shop recently, and if so, for what? Do you have both fuel and spark? Were there any symptoms or signs before this? Don't touch the gas pedal while your trying to start it.

Jun 16, 2009 | 2003 Hummer H2

1 Answer

Hummer was on in my drive way then it shut off now it wont sart


Mar 14, 2009 | 2003 Hummer H2

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