GMC Chevrolet Silverado 2500HD 2021 Owner's Manual page 20

Caution
When replacing the battery, do not touch
any of the circuitry on the transmitter.
Static from your body could damage the
transmitter.
Caution
Always replace the battery with the
correct type. Replacing the battery with
an incorrect type could potentially create
a risk of battery explosion. Dispose of
used batteries according to instructions
and local laws. Do not attempt to burn,
crush, or cut the used battery, and avoid
exposing the battery to environments
with extremely low air pressures or high
temperatures.
Replace the battery in the transmitter soon
if the DIC displays REPLACE BATTERY IN
REMOTE KEY.
To replace the battery:
1. Press the button on the RKE transmitter
to remove the key. Never pull the key
out without pressing the button.
Keys, Doors, and Windows
2. Insert a flat, thin object in the center of
the transmitter to separate and remove
the back cover.
3. Lift the battery with a flat object.
4. Remove the battery.
5. Insert the new battery, positive side
toward the back cover. Replace with a
CR2032 or equivalent battery.
6. Push together the transmitter.
7. Insert the key back into the RKE
transmitter.
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