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Four-wheel drive light.
On an electronic four wheel drive system such as this one there are a few different things that may trigger a four wheel drive light. A faulty solenoid or motor on the transfer case, an inoperative front differential actuator, or...
Traction Control Fail light on
While this code can be a illuminated for a number of reasons, you are correct that it has to do with servicing the stabilizer system. This light is actually a common one, and the repairs I have seen involve reprogramming...
Starter problem due to several possible issues.
Try another key first to see if this works before going into diagnosis. If this works then a replacement key will fix your problem. If the theft light will not go out on your dash then you know it is...
Moonroof drain plugs clogged
Hello. This problem is common to Hummer H3s. It is an involved fix, and most of the incidences are related to the front drain tubes, as the vehicle sits at a slight rake to the front. Access to these is...
won't start almost dies
Hello. It sounds like the battery is indeed low causing the starting issue. From what you are explaining it sounds like the battery may be low because the alternator is failing and needs to be tested. Your symptoms point to...
Clicking noise from steering wheel
Hello, thanks for writing in. Most of the time this clicking noise is from the column covers rubbing on the steering wheel. I usually remove the covers and drive the vehicle to see if it goes away. If it does...
car not starting battery
Hi there. It sounds like you need a new ignition switch. This is the most common failure on your vehicle that will cause this. It can also be a failure in the body control module, but that is not nearly...
Electrical or transmission problems with Hummer
Hi there. This vehicle is known for having a history of electrical issues. From the symptoms you are getting it sounds like a bad ignition switch or a failing body control module. Most of the time it is the ignition...
Car bogs down when I cut the wheels too sharp
Your vehicle has a variable power steering assist. If you turn the steering wheel, a sensor will detect that the wheel is being turned and if you go all the way to lock the wheel the assist is lowered. This...
Intermittent issue where car is stuck in first after coming to full stop, and speedometer stays at zero
You have two symptoms that are pointing to the same problem. Both your speedometer, and your transmission, use the VSS (vehicle speed sensor). The transmission uses the data to calculate shift points. If there is not any output, the computer...
EVAP Small Leak Code P0442 Lit MIL. Code cleared, has not reappeared. But, Diagnostic tool still shows Emission Related DTC's
In order for all the monitors to clear you will have to do a lot of driving to see if it clears. The last two to clear take highway driving at a steady speed to clear and may take a...
Intermittent issue where after a stop car is stuck in first, speedometer at zero. Had output speed sensor changed, no change.
Hello there, a few possible faults could cause the vehicle to become stuck in first. The most common would be low fluid level, shift solenoid, transmission range sensor, or a transmission mechanical fault. I'd suggest getting this looked at by...
3.7 engine temperature gauge runs between middle to 3/4, leans a little more to 3 /4 never over is this normal
Hi there, thanks for writing in about your 2007 Hummer H3. The temperature should typically rest more towards the middle of the gauge. You should have the vehicle tested to see if the engine is running hot, or if it...
Sunroof leaking
If the dealership cannot open the sunroof, then the entire sunroof assembly may be in need of replacement. With this vehicle no longer in production, the parts may not be available. The entire interior roof panel should be removed to...
MAP sensor
Hello. MAP stands for manifold absolute pressure. So the answer to your question would be that it is the manifold absolute pressure sensor that there is something wrong with. The map sensor reads the pressure in the manifold and sends...
Car turns over but won't start
Hi, thanks for writing in. If, during a "no start" session, waiting slightly more than 10 minutes allows you to successfully start your H3, the problem is not with the fuel system. A failure of the ignition switch (an internal...
P0300 code, misfiring on a '06 Hmamer H3
Those things are notorious for having fuel injection problems. GM made them with cheap plastic and the fuel injection parts, so when they get to be older, after 10 years old, the plastic cracks, leaks, and gets multiple misfires. That's...
Advice on buying an O3 Hummer H3
Yes they do. I have a lot of customers that have had them go bad, and usually it was before 100,000 miles. Don't buy the Hummer. They have all kinds of problems. That's one of the reasons they stopped making...
Car suddenly went into limp mode
Hello and thank you for contacting Your Mechanic. Your Hummer could have the brake system engaged for the traction control. Disable the traction control and see if the engine will increase in speed. Another thing to check is the...

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