GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 326

Radios with a Single CD player or
radios with a Six-Disc player displays CHECK DISC
and/or ejects the CD if an error occurs.
Radios with a CD and DVD player may display other
messages when an error occurs:
The disc was inserted upside down.
A disc was inserted with an invalid or
unknown format.
There are disc LOAD or disc EJECT
problems.
It is very hot. When the temperature returns to
normal, the CD should play.
The road is very rough. When the road becomes
smoother, the CD should play.
The CD is dirty, scratched, wet, or upside down.
The air is very humid. If so, wait about an hour and
try again.
There could have been a problem while burning
the CD.
The label could be caught in the CD player.
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If the CD is not playing correctly, for any other reason,
try a known good CD.
If any error occurs repeatedly or if an error cannot be
corrected, contact your dealer. If the radio displays an
error message, write it down and provide it to your
dealer when reporting the problem.
The DVD player is controlled by the buttons on the
remote control, or by the RSA system, or by the buttons
on the radio faceplate. See Remote Control , under
and
information.
The DVD player is only compatible with DVDs of the
appropriate region code that is printed on the jacket of
most DVDs.
The DVD slot of the radio is compatible with most
audio CDs, CD-R, CD-RW, DVD-Video, DVD-Audio,
DVD-R/RW, DVD+R/RW media along with MP3 and
WMA formats.
If an error message displays on the video screen or the
radio, see DVD Display Error Messages under,
DVD Radio Error Messages in this section for more
information.
for more
and