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H3

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Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
How much is it to replace the rear main seal on a 2007 Hummer H3
Hello. It is common for the rear main seal to leak on this engine. Over time the seal fails and this occurs. You will need to take this to a shop that can remove the transmission to change the seal...
Question
Im looking at a 2007 hummer H3 for 28K (AUD). I have a tight budget. Should I buy this or not? Are the service, repair costs and maintenance expensive?
Hi there. When it comes to buying a vehicle, the first thing would be to research the vehicle and see what other people have had replaced. Check for simple pricing with local shops to determine if you could afford the...
Question
My car is overheating when the air conditioning is on - 2007 Hummer H3
Hello. Running the A/C will put extra strain on the engine and cause it to heat up quicker. If your vehicle is overheating, you should keep it below 280 degrees at all cost. This is the temperature when extreme irreversible...
Question
door lock problem
Hi there: Based on your question and the information listed, it's possible that you've got an exposed wire somewhere in your vehicle that is causing a short with your door locking mechanism. Sometimes this issue is caused by a faulty...
Question
door lock problem
Hello. There is a computer that controls the door locks and the warning light that you see. It is known as the Body Control Module. Something has likely gone wrong with this module, which may or may not be repairable....
Question
Hello 2006 model Hummer car's fuel consumption too high
Hello: In most cases, the OBD-II error code you wrote down in your question is related to a faulty crankshaft position sensor. When this component is damaged, it can impact the ignition timing of the engine, causing increased fuel consumption,...
Question
The vehicle keeps turning off while driving. Hummer H3
Hello - the first task is to determine what problem codes are being set here. This will guide diagnosis, and tell whether it's a fuel supply issue (fuse, fuel pump relay, or fuel pump itself), or possibly an electrical sensor...

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