How to Replace the Key Fob Battery in a Cadillac ELR

Steps from the 2016 Cadillac ELR owner's manual.

Press the button near the bottom of the transmitter and pull the key out.
Use the oval base of the key blade to separate the two transmitter halves.
Remove the old battery without using a metal object.
Insert a new CR2032 or equivalent battery in the back housing, positive side facing down.
Align the key release button and snap the transmitter back together.

Replace when REPLACE BATTERY IN REMOTE KEY shows in the DIC.
Do not touch the circuitry, because static could damage the transmitter.

Source: 2016 Cadillac ELR owner's manual, PDF pages 37, 140. 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.

Confirm with your own manual, dipstick or door-jamb label.
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