How to Clear the Service Engine Soon on a 2002 GMC Truck

by Katebo
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detail: glowing dashboard image by davidcrehner from

A 2002 GMC truck needs an OBD scan tool to clear the "Service Engine Soon" light. There is a computer within the vehicle called On-Board Diagnostics, or OBD, that monitors the various systems within the vehicle. It also keeps track of when you need routine maintenance. To keep the computer functioning properly so it keeps track of when the maintenance is due, you must use the OBD scan tool to read the code to find out exactly what type of servicing is needed. Then you simply use the tool to reset the light. Make sure you have the servicing performed before you clear the light.

Step 1

Locate the diagnostic connector port on the driver's side of the vehicle. It is located on the underside of the dashboard, between the center console and the steering column. Plug the OBD scan tool connector end into the diagnostic connector port.

Step 2

Put the key into the ignition and turn it to the "on" position. This will power the scan tool on. Make sure you don't turn the key too far and start the engine.

Step 3

Wait for the code to appear on the screen of the scan tool then press "Erase." If you are prompted by the question "Are you sure?," press "Yes." This clears the codes and you should see the "Service Engine Soon" light disappear from the instrument cluster. Unplug the scan tool and turn off the vehicle.

Step 4

Turn the engine on and check to see that the "Service Engine Soon" light is still off.

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