How to Replace the Key Fob Battery in a GMC Acadia

1. Press the button on the side of the remote key near the bottom.
2. Pull the mechanical key out of the remote key without pulling it before pressing the button.

• Replace the battery when the Driver Information Center displays REPLACE BATTERY IN KEY.
• Use the correct battery type and do not touch the circuitry inside the remote key.
• Reassemble the remote key properly so it is sealed against liquids.

Source: 2026 GMC Acadia owner's manual, PDF page 12. 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.