How to Reset the Oil Life on a GMC TopKick

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 OFF.

• Reset the system every time the oil is changed.
• If the change engine oil light comes back on when the vehicle is started, the system has not reset; repeat the procedure.

Source: 2010 GMC TopKick owner's manual, PDF page 229. 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.