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A check engine light can indicate a broad spectrum of problems with your 2003 GMC Sierra Denali. 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 Sierra Denali, how to read the trouble codes and how to reset or clear the check engine light using a scanner on your Sierra Denali.
Intermittent Check Engine Light: If the check engine light on your 2003 Sierra Denali 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 Sierra Denali, 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 Sierra Denali 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 Sierra Denali diagnosed by a professional automotive technician.
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