1. Getting Started - Prepare for the repair
2. Locate OBD Port - Find the OBD port on your vehicle
3. Scan for Codes - How to scan your vehicle for trouble codes
4. More Info. - Additional information on check engine lights
A check engine light can indicate a broad spectrum of problems with your 2003 Hummer H2. In some cases you need to pull over immediately to prevent damage while in others you merely need to tighten you gas cap next time you stop in order to reset the service engine soon light. The video above shows how to locate the on board diagnostics (OBD) plug on your 2003 H2, how to read the trouble codes and how to reset or clear the check engine light using a scanner on your H2.
Intermittent Check Engine Light: If the check engine light on your 2003 H2 is intermittent, try to take note of the conditions when this happens. For example, does it happen when you accelerating, driving on the highway or does it appear at low speeds? This will help your mechanic evaluate the issue. Steady Check Engine Light: If your check engine light is on every time you operate your H2, you need to have it checked as soon as possible, especially if you notice performance problems or unusual noises. Flashing Check Engine Light: If your check engine light is flashing, stop driving your H2 and have it towed to your nearest mechanic - you probably have a very serious problem with your car and you risk ruining your engine by driving it. If you are unsure about what your diagnostic trouble codes mean; have your H2 diagnosed by a professional automotive technician.
Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road.
Properly inflated tires is the easiest way to improve fuel economy. The right tire pressure is NOT on the side of your tire btw
The best way to fix leaking hoses is to replace them, but if you don't have time, a stop leak product might work for you
Leaking coolant is usually a sign that your water pump needs to be replaced. This video shows you how to quickly plug it
If you are leaking oil and parking on your oil spots each night, the oil is breaking down your tires' rubber