How to Reset the Computer on a GMC

by Alibaster Smith
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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. This scan tool can be purchased from most auto parts stores and is required to reset the vehicle's computer.

Step 1

Open the door on your GMC vehicle and locate the port to the left of the fuse panel.

Step 2

Plug the electrical connector from the OBD scan tool into the OBD port.

Step 3

Turn the ignition key to the "II" position.

Step 4

Wait for the check engine light to go out. At this point, your engine codes will be reset. You will also get a reading on your OBD scan tool, which will tell you any error codes. Some tools have a "reset" button, which allows you to control the resetting of the computer rather than letting the scan tool automatically clear the codes.

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