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H2

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Question
No oil on dipstick and slightly lower oil pressure
Hello. If you are checking the oil at the dipstick and it is being added to the correct area then you more than likely have a serious internal sludge issue. If there is a lot of sludge then the oil...
Question
Water leak in driver's side floorboard
Your water leak could be coming from numerous locations. However, if your vehicle has a sunroof, the drain tube may be the cause. This tube drains right onto the floor boards. Other potential causes include the windshield, marker lights and...
Question
Feels like a broken shifter cable
This is definitely related to a shift linkage which is likely broken or loose. Sometimes the shift linkage bushings wear out and will cause this problem. There is a repair kit out on the market for this that is relatively...
Question
won't start hot cable
Hot electrical cables or connections indicate either excessive current flow, or excessive resistance in a connection. Test the battery first. All battery cable connections should be clean and tight. You should not be able to move cables by hand. ...
Question
overheating problem
Thanks for writing in about your Hummer H2. Let's cover the basics of diagnosing a overheating issue. First, verify the actual temperature at the thermostat housing. Cooling system (and cap) has probably been pressure tested by now. If it tends...
Question
#3 Misfire engine light
Yes, it can be an electrical issue. A misfire at a particular cylinder can be caused by ignition, fuel injection, mechanical issue, or vacuum leak. I'm curious why none of the dealership techs repaired it. Faulty sparks plugs, coils, or...
Question
wiper blades working reverse
I suggest first inspecting the wiper crank arm assembly between the wiper linkage and the motor. It may have slipped out of position. If that is secure, then yes, it sounds like you need the wiper motor and module assembly....
Question
shuts off after driving
If I was diagnosing your Hummer, I would want to know if there were any diagnostic trouble codes (DTCs) stored in any of the computer modules. I would see if the Check Engine light was on and use my scan...
Question
Gauges not working
This is a common issue. The instrument cluster in your Hummer uses stepper motors to move the needles. Sometimes the stepper motors fail and wont work at all, and other times they give a crazy reading like needle in the...
Question
Key not turning
Hi, if the key won't turn in the ignition then the tumblers inside or the key itself may be worn out. Debris can get lodged inside as well preventing the cylinder from rotating. A certified technician, such as one from...
Question
I changed spark plugs and wires & cleaned throttle body, car idles rough and gas mileage is changed does not backfire or anything
A few different components could be causing your issue. Your symptoms sound at first like a spark issue. If a plug was tightened down too hard, the gap can become smaller than intended. This would decrease the power of the...
Question
Sludge in engine, constantly low on oil
If you are losing that much oil, and there are no external leaks (leaks that are visible outside), your vehicle may be consuming the oil. Unfortunately this can be harder to diagnose than an external leak. The valve guides and...
Question
Don't know if the transmission went out.
A large transmission leak like one from a cooler pipe or a leaking transmission pan can cause the transmission to slip if the level gets low enough. Trying to drive the vehicle while the transmission is slipping does not help,...
Question
Engine sludge?
If you have excessive sludge in the engine, then the oil that you pour into the engine may not be able to drain down into the oil pan. You should change the oil and filter using 6 quarts of 0w30...
Question
What would cause an engine oil pan gasket to go out at 120,000 miles on a 2008 H2 Hummer?
Hi. The best way to explain why an oil pan gasket would start leaking is due to heat from running the engine which causes expansion and the engine cooling when not running which equals shrinkage. Over time, things just wear...
Question
Bus not starting
Hey there. This may be caused by a few different things which all seem to indicate you have a fuel supply problem. This may be caused by low fuel pressure, dirty or faulty fuel injectors, low voltage to the fuel...
Question
No oil on the dipstick
My first recommendation is to NOT START this engine until there is sufficient oil showing on the dipstick. Even if there was excessive sludge in the area of the valve covers, after an hour or two, most of the oil...
Question
Where do i fill up the radiator on a H2 Hummer 2006
Coolant on your vehicle should be added to the reservoir that is located on the passenger side of the engine compartment. It will have a cap on top, that can be removed when the engine is cool, and allow for...
Question
My Hummer shows code P0300 after getting gas
You may have got contaminated fuel from the gas station. The code P0300 indicates you are getting a random engine misfire. This random misfire does not point to any one cylinder misfire and indicates that the fuel may be contaminated...
Question
My high beam light does not work on left side. I don't think it is the bulb.
Hi there. There could be an issue with the high beam switch. Check to make sure that the wires are connected correctly to the high beam switch. Also, check the bulb in the high beam on the left side. See...

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