How to Replace the Key Fob Battery in a Chevrolet Silverado 2500HD/3500HD

1. Press the button on the side of the remote key near the bottom.
2. Pull the mechanical key out of the remote key.
3. Use the mechanical key blade in the slot to remove the battery cover by hand.
4. Remove the battery cover.

• Never pull the mechanical key out without pressing the button.
• Do not touch the circuitry, and use the correct battery type.
• Page text ends after the cover removal; later steps for the battery and reassembly are not shown.

Source: 2026 Chevrolet Silverado 2500HD/3500HD owner's manual, PDF pages 17, 16. 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.