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Mirror won't swivel using inside switch
Hi. If your mirror is not longer functioning correctly, it may be possible that the mechanism connecting the mirror to the motor has become damaged. Many times, these are made of plastic, and can become brittle and easy to break....
Power window not working
The most likely causes of your power window not working are the motor, or the regulator. If you hear the motor noise, but the window does not move, then the regulator is broken. If you do not hear the motor,...
Rear left side running light above the left rear wheel turns on and off intermittently
Sometimes wiring problems may not be immediately obvious. If your light is coming on and off, intermittently then that may be an indication that there may be a wiring problem with that bulb or light's circuit. I would recommend a...
Four-wheel drive service message appearing
Hi there. The system uses the instrument cluster module to alert issues with the 4WD system on you vehicle. The issues can be diagnosed by scanning your computer system to identify a possible problem. Your system may have a poor...
Air flow going up and down when gauges go up and down
The electrical system on these vehicles are known to have an issue with fretting corrosion buildup in multiple electrical connectors throughout the vehicle. An affected system would need to have that electrical connection disconnected, cleaned, and a dielectric compound put...
Power steering leak and HVAC fan problem
Hello. It would first need to be determined where the power steering leak is coming from. Your blower motor or resistor could be bad and be the reason you are having the problem with the HVAC fan speed. Because the...
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...
Check Engine code p0758
A P0758 code indicates a problem with the vehicle's shift solenoid, specifically shift solenoid B. If this light has come on, then the vehicle may be experiencing poor performance, or unusual shifting. As this component is located on the underside...
Heat and air controls broken
Hi. This can be caused by two things. There are actuators or motors under the dash that operate doors in the vent system. These door direct air to the different vent locations. The actuators can be ran by vacuums or...
Hummer not making any noise when cranking
If your vehicle is not starting, but the battery is okay, that may be a sign of several other possible problems. There may be a problem with the starter, with its electrical system, or perhaps a problem with the ignition...
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...
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...
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. ...
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...
#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...
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....
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...
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...
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...
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...

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