Good morning,
All you need to do is to turn the ignition key to the on position and press the accelerator pedal to the floor and let it up 3 times in 10 seconds and that should reset the service reminder light.
I also attached the other method for you as well below.
Roy
RESET THE ENGINE OIL LIFE INDICATOR
NOTICE: The GM Oil Life system does not know how much oil is in your engine, so you will have to check the oil level regularly.
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1. With the engine running or the ignition key in "RUN" and the engine off, press and release the trip odometer reset stem until the "OIL LIFE" message is displayed in the message center.
2. Press and hold the trip odometer stem for a few seconds until a chime sounds five times and "RESET" is shown in the message center.
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3. The message center returns to displaying the odometer after the reset is complete.
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Wednesday, October 28th, 2020 AT 4:57 AM