How to Replace the Key Fob Battery in a Chevrolet Avalanche

1. Pry the transmitter apart with a thin flat object such as a flat head screwdriver, using the notch on the parting line.
2. Insert the tool carefully and stop when you feel resistance, then twist it to separate the halves.
3. Take out the old battery without using a metal object.
4. Insert a new CR2032 or equivalent battery with the positive side facing down.
5. Snap the transmitter back together.

• Replace the battery when the REPLACE BATTERY IN REMOTE KEY message shows in the DIC.
• Do not touch the circuitry on the transmitter, since static could damage it.

Source: 2013 Chevrolet Avalanche owner's manual, PDF page 38. 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.