GM Oil Life System - Resetting
Follow this procedure to reset the GM oil life system:
Turn the ignition to ON without starting the engine.
Fully press and release the accelerator pedal three times within five seconds.
If the CHANGE OIL SOON indicator flashes two times, the system is reset.
If the CHANGE OIL SOON indicator comes on and stays on for five seconds, try to reset the system again.
Try this, straight from gm dealer world. if ti doesn't work it's probably the cluster.
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