GMC Yukon Denalid Owner's Manual page 301

The CD player can play the smaller 3 inch (8 cm)
single CDs with an adapter ring. Full-size CDs and
the smaller CDs are loaded in the same manner.
If playing a CD-R, the sound quality may be
reduced due to CD-R quality, the method of
recording, the quality of the music that has been
recorded, and the way the CD-R has been
handled. There may be an increase in skipping,
difficulty in finding tracks, and/or difficulty in loading
and ejecting. If these problems occur, check the
bottom surface of the CD. If the surface of the
CD is damaged, such as cracked, broken,
or scratched, the CD will not play properly. If the
surface of the CD is soiled, see Care of Your CDs
and DVDs on page 338 for more information.
If there is no apparent damage, try a known
good CD.
Notice: If you add any label to a CD, insert
more than one CD into the slot at a time, or
attempt to play scratched or damaged CDs, you
could damage the CD player. When using the
CD player, use only CDs in good condition
without any label, load one CD at a time, and
keep the CD player and the loading slot free of
foreign materials, liquids, and debris.
Do not add any label to a CD, it could get caught
in the CD player. If a CD is recorded on a
personal computer and a description label is
needed, try labeling the top of the recorded CD
with a soft marker instead.
If an error appears on the display, see "CD
Messages" later in this section.
CD (Eject): Press and release the CD eject
Z
button to eject the CD that is currently playing
in the bottom slot. You will hear a beep and
Ejecting Disc will be displayed. Once the disc is
ejected, Remove Disc will appear on display. The
CD can be removed. If the CD is not removed,
after several seconds, the CD will be automatically
pulled back into the player.
If loading and reading of a CD cannot be
completed, such as unknown format, etc., and the
disc fails to eject, press and hold the DVD eject
button for more than five seconds to force the disc
to eject.
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