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The computer on your GMC vehicle generates and stores error codes. An error code does not always mean that something is wrong with your vehicle. Error codes are generated when regular maintenance is required. After you've fixed the broken component or done the required maintenance, you will need to know how to reset the computer and clear all of the error codes so that the check engine or warning light in your GMC vehicle will go out. GMC vehicles use an on-board diagnostic--or OBD-style--port that accepts a special tool called an OBD scan tool. Most auto parts stores have this tool and will perform this task for a nominal fee, and some will do it for free (ie. - Advance Auto, AutoZone, etc.). Hope this helps!
In order to read engines codes from a GM car you will need a OBD II Code Reader.
You can pick them up at your local automotive oriented store. If you live in Canada, Canadian Tire, Walmart (In the states too), etc..