How to Reset the Oil Life on a GMC T Series

1. Turn the ignition key to ON/RUN with the engine off.
2. Fully press and release the accelerator pedal slowly three times within five seconds.
3. Check that the change engine oil light turns off, which shows the system is resetting.
4. Turn the key to LOCK/OFF.

• Reset the system whenever the oil is changed, even if the change engine oil light was not on.
• If the change engine oil light comes back on when the vehicle is started, the reset failed; repeat the procedure.

Source: 2010 GMC T Series owner's manual, PDF page 168. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.