GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 348

The audio system is acquiring and
processing audio and text data. No action is needed.
This message should disappear shortly.
This channel is not currently in
service. Tune in to another channel.
This channel is blocked or cannot be
received with your XM Subscription package.
This previously assigned channel is
no longer assigned. Tune to another station. If this
station was one of the presets, choose another station
for that preset button.
No artist information is available at this
time on this channel. The system is working properly.
No song title information is available at
this time on this channel. The system is working
properly.
No category information is available at
this time on this channel. The system is working
properly.
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No text or informational messages are
available at this time on this channel. The system is
working properly.
There are no channels available for
the selected category. The system is working properly.
The XM receiver in the vehicle could
have previously been in another vehicle. For security
purposes, XM receivers cannot be swapped between
vehicles. If this message is received after having the
vehicle serviced, check with your dealer.
If tuned to channel 0, this message
alternates with the XM
This label is needed to activate the service.
If this message is received when tuned to
channel 0, there could be a receiver fault. Consult with
your dealer.
If this message does not clear
within a short period of time, the receiver could have a
fault. Consult with your dealer.
If this message does not clear
within a short period of time, the receiver could have a
fault. Consult with your dealer.
Radio 8 digit radio ID label.