Chevrolet 2008 Colorado Owner's Manual page 321

To replace one of these bulbs:
1. Open the tailgate. See Tailgate on page 2-10 for
more information.
3. Pull the lamp assembly away from the vehicle.
4. Turn the bulb socket counterclockwise to remove it
from the taillamp assembly.
2. Remove the two rear
lamp assembly screws
near the tailgate latch.
5. Holding the socket, pull the old bulb to release it
from the socket.
6. Push the new bulb into the socket until it clicks.
7. Insert the bulb socket into the taillamp assembly
and turn it clockwise to secure.
8. Reinstall the taillamp assembly and tighten the
screws.
9. Close the tailgate.
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