GMC CHEVROLET Silverado 1500 2021 Owner's Manual page 352

Uplevel Taillamp Assembly
1500 shown 2500/3500 similar
1. Back-Up Lamp
It is recommended to replace the grommets
when replacing a bulb. See your dealer.
To replace one of these bulbs:
1. Open the tailgate.
2. Remove the two rear lamp assembly
screws.
3. Pull the rear lamp assembly outward and
rearward away from the box side to
remove it from the vehicle.
Vehicle Care
4. Turn the bulb socket counterclockwise.
5. Pull the bulb straight out from the
socket.
6. Replace the bulb and reverse Steps 1 5
to reinstall.
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