Question about 2006 Hummer H3

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2006 H3 engine will not start periodically

Go to start vehicle and it will not start. Doesn't matter if it is cold in morning or after been driving off and on all day. Sometimes it just will not start. After I wait 10 to 15 minutes, it will start. Very frustrating at gas stations.

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It might be the Starter Safety Switch which prevents the car from starting while in gear. Try jiggling the shifter while in Park, or put it in Neutral and try it.

Posted on Oct 07, 2009

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1 Answer

2006 hummer h3 shuts off allof a sudden


The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems ca cause many drive-ability related problem such as rough idle and other symptoms



Oct 16, 2012 | 2006 Hummer H3

1 Answer

Is there a steering column security system doesn't allow starts on cold mornings?


I posted some information about your security system on the other question that you posted where you mentioned the pellet in the key on your older vehicle.

Let me ask you this: Does the starter not crank the engine when you are experiencing this difficulty? Or is the starter cranking the engine and it just won't start?

The reason I ask is because if the starter cranks and your problem only occurs on cold mornings, the problem is most likely to be caused by a malfunctioning Engine Coolant Temperature (ECT) sensor.

In any case, you should scan your computer network for possible fault codes to begin any diagnosis of either your engine control system or your security system (Unless you really like wasting your hard-earned cash trying to "GUESS" what is wrong).

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This morning when I attempted to start my 2006 Hummer H3, nothing happened. I thought I may have a dead battery but the lights and radio work fine. I then noticed the Passlock security lock light was on...


Hello:Try this procedure: turn key on, turn to start, let key come back to on wait ten minutes, turn key off wait 10 seconds turn key back on wait 10 minutes. turn key off wait 10 seconds turn key back on wait 10 minutes turn key off wait 10 seconds NOW try and start. In addition you might try tapping on switch assembly while trying to start. There is not any way to disable passlock. You might try having the engine control system codes read

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I also have a 2006 H3 that the air conditioning was working great and was blowing super cold. then for 2 days i would try to turn the air on and it wouldnt work until the H3 was running for 10mins then it...


is freon level correct. does compressor come on when turned to cold? if it doesn't freon may be low or compressor may be bad. theres also an outside possibilty of the control being bad.

Jan 17, 2011 | 2006 Hummer H3

1 Answer

I have a 2006 Honda Accord....its been very cold outside and every morning i turn on the car and i hear a noise..not sure if its coming from the engine...but it goes away after I start driving and the...


When is really cold, and vehicles with non electrical power steering start for the first time after a good period of inactivity the power steering pump tents to wine, that is normal, some other cars or almost all the cars when they pass 100.000 miles develop a little metallic noise that goes away when the oil pump distributes and lubricates all moving parts inside the engine when the car starts first thing in the morning in a really cold morning.

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try replacing your idle control censer it is normal for a car to idle high for a short period when it is cold but only for about 60 seconds

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1 Answer

Intermittent Problem


Not sure if my situation helps or not, but here you go.....

I have a 2006 H3 that has 21,000 miles, last week my husband was driving and lost power, service engine came on, and it kept flashing stabilization problem. Called roadside assistance and had it towed to the dealership. Dealership said it was a dead battery and replaced it. Took the vehicle home and didn't drive for a couple of days. Drove again a couple of days later with no problems. 2 days later tried to start and vehicle had no power could not start at all. Called road side assistance and had it again towed to dealership. Dealership told us the main computer was bad and had to be replaced. We were told it is NOT a common problem, heres hoping we don't have any other issues with the vehicle.

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