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A check engine light can indicate a broad spectrum of problems with your 2002 GMC Yukon XL 2500. 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 2002 Yukon XL 2500, how to read the trouble codes and how to reset or clear the check engine light using a scanner on your Yukon XL 2500.
Intermittent Check Engine Light: If the check engine light on your 2002 Yukon XL 2500 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 Yukon XL 2500, 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 Yukon XL 2500 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 Yukon XL 2500 diagnosed by a professional automotive technician.
If you have an electrical component that doesn't work, try replacing the fuse first2002 GMC Yukon XL 2500 SLT 8.1L V8
If you are leaking oil and parking on your oil spots each night, the oil is breaking down your tires' rubber2002 GMC Yukon XL 2500 SLT 8.1L V8
Dirty cabin air filter cause undue wear on your car's heater and AC and can cause bad odors2002 GMC Yukon XL 2500 SLT 8.1L V8
If your blinker doesn't blink, or blinks rapidly, you likely have a burnt out bulb2002 GMC Yukon XL 2500 SLT 8.1L V8
If your battery has green or white cruddy deposits, it is probably not getting enough juice from and will likely wear out sooner2002 GMC Yukon XL 2500 SLT 8.1L V8
If your transmission is running low on fluid, be sure to add some - find out how to do this here!2002 GMC Yukon XL 2500 SLT 8.1L V8