1. Locate the diagnostic port under the dashboard of your GMC Van. It is usually located near the steering column or underneath the driver-side dash.
2. Connect the OBD-II scanner to the diagnostic port.
3. Turn on the ignition of your GMC Van, but do not start the engine.
4. Navigate through the scanner menu to find the option to reset the check engine light. The exact menu options may vary depending on the scanner you are using.
5. Select the option to reset the check engine light and confirm your selection.
6. The scanner will then communicate with the vehicle's computer and reset the check engine light.
7. Turn off the ignition and disconnect the OBD-II scanner.
8. Start the engine of your GMC Van and verify that the check engine light is no longer illuminated.
Note: If the check engine light comes back on after you have reset it, there may still be an underlying issue that needs to be addressed. It is recommended to have your vehicle inspected by a qualified mechanic to identify and fix the root cause of the check engine light.
