Question about 2003 Hummer H2

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After an oil change my hummer looses oil pressure and I have to turn the truck off. After it sits for a minute the restart pressure comes up. I have to repeat this several times in order to drive.

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Are filling the oil filter before you put it on ?

Posted on Mar 01, 2010

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Did you check the oil pump stream? dirty or low **** oil in the bottom oil pan. check the oil pressure with the oil pressure tool meter and get a trusted values

Posted on Feb 05, 2010

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1 Answer

I have oil pressure when I start the Truck then over time when truck warms up the oil pressure drops to 0


Sounds like you need to have the pressure checked with a mechanical gauge. Make sure the oil pressure sensor is in the loop when you do so the fuel pump will run.
If the pressure is normal when the engine is warmed up, it could be something with the instrument cluster.

Feb 01, 2013 | 2008 GMC Yukon

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Oil pressure low sensor is coming on my Hummer H2 and engine is knocking


Your oil is low or you have a bad oil pressure switch / sensor

Jan 22, 2013 | Hummer H2 Cars & Trucks

1 Answer

Why does my oil light come on sitting at a red light or stop sign. But when I start driving it turns off?


Oil pressure is always lower at idle speed.I'm guessing you have high mileage.If your oil light is not coming on in drive at idle with the engine cold,but it does when hot,your bearing clearances are probably getting a little loose.Try using one quart of Lucas oil additive in place of a quart of oil at your next change(or just change it now).This stuff is thick and stringy,it helps the oil cling to surfaces.(if there is no change after this,you could try a new oil pressure switch-it's cheap enough.I actually had the switch on my 95 dakota leaking a LOT of oil at high pressure/RPM,which affected the reading).

Mar 14, 2012 | 1998 Chrysler Town & Country

1 Answer

I have a 2006 h2 hammer thats read low oil pressure and i just had an oil change whats going on


The gauge or sending unit could be bad, so you need to screw in a mechanical gauge once to verify.
Then there is the possibility they put in too thin of oil. Of you could have a leak letting pressure out, like a loose pump. Don't wait.

Aug 10, 2011 | Hummer H2 Cars & Trucks

2 Answers

I have a h1 hummer that will not start i have changed the glow plugs and the controler also the box on the injecter pump. I am geting fuel and the glow plugs are working. The hummer has set for a year....


Diesel fuel doesn't go bad like gasoline, at least not as fast. I've been around diesels in construction equipment and sometime a machine will sit for a couple years and still start right up. You have other problems. I don't know that much about the Hummer diesels but, Ford uses a high pressure oil pump to fire the injectors. The main oil pump supplies oil to the high pressure oil pump reservoir and then the high pressure pump supplies oil to the injectors. If Hummer uses a similar system the reservoir may have drained down and there is no oil for the high pressure pump to pump. Ford has plug where a person can fill that reservoir manualy if necessary. Maybe try cranking it some more, don't crank it more than 10-15 seconds at a time. Walk away from it for 10 minutes or so, then try again, make sure you let the glow plugs cycle. If it don't start after a half dozen tries, you may have to have a mechanic look at it. I'm sorry I can't be more help.

Feb 11, 2010 | 2002 Hummer H1

3 Answers

The blower motor stops working sometimes on my 2007 Hummer H3. Sometimes you can turn the ignition off and wait a little while, then restart it and the blower starts working.


I had the same problem and sloved it with the help of google images, hummer blower motor resistor. Under the glove box the blower motor resistor can be found. It comes loose and the blower will work at times. When I reached under and pushed the connector in, it works fine. It was fixed within minutes. I am a gal with a Hummer and save myself a huge dealer bill. Good Luck!

Dec 20, 2009 | 2007 Hummer H3X

1 Answer

2001 lincoln navigater lifters tapping and oil pressure gauge drops when engine has been running for 20 minutes or so. Then when you allow it to sit for about 15 minutes and restart it the oil pressure is...


did you by chance had the oil filter changed because there is a antidrain back valve in the filter,also if the filter is plugging up it will bypass to line pressure.causing lower oil pressure.try the filter first then have oil pressure checked when cold and again when hot.

Aug 18, 2009 | 2003 Lincoln Navigator

1 Answer

Oil Sensor light keeps coming on 2003 H2 Hummer


There is a sensor located on the oil pan. If the plug-in to this sensor comes loose it or if the sensor fails, it will send the low oil signal. You are wise to check the oil to confirm it is not low.

Jul 05, 2009 | 2006 Hummer H3

2 Answers

High oil pressure in my humer h2


First thing that i would reccomend is switching to 5w30 oil since this is what GM wants you to run in your hummer. Next i assume your gauge is pegged out and doesn't fluctuate. You are going to have to take your hummer down to the local dealer and have a computer hooked up to see if the gauge is bad or the oil pressure sender is bad, more than likely the sender. thanks for using fixya !! have a nice day

Mar 15, 2009 | 2006 Hummer H2

1 Answer

Car stalls when oil pressure drops...20 minutes to restart


No it is a fail safe. When your oil pressure drops below (on most cars) 30 psi your computer will shut your fuel pump down until you either let it sit for a while and it resets or until oil pressure builds again. Sorry!

Mar 11, 2009 | 1992 Buick Roadmaster

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