How do you reset check engine light on a GMC Van?

To reset the GM Oil Life System after an oil change:

1. Turn the ignition to ON, with the engine off.

2. Fully press and release the accelerator pedal three times within five seconds.

3. If the CHANGE ENGINE OIL light message flashes, the system is reset. However, if it stays on, it did not reset. You'll need to refer to the vehicle's owners

manual or your local GM dealership.