How to Replace the Key Fob Battery in a Cadillac CTS and CTS-V

Steps from the 2019 Cadillac CTS and CTS-V owner's manual (RKE transmitter).

Press the button on the side of the transmitter near the bottom and pull the key out.
Insert the key into the bottom center of the transmitter, not the key slot, and separate the two halves.
Remove the old battery without using a metal object.
Insert the new CR2032 or equivalent battery in the back housing with the positive side facing down.
Align the front and back housing and snap the transmitter together.

Replace the battery when the DIC displays REPLACE BATTERY IN REMOTE KEY.
Do not touch the circuitry; static from your body could damage the transmitter.

Source: 2019 Cadillac CTS and CTS-V owner's manual, PDF page 36. 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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