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Any other associated clues; strange noises, feels different when driving etc? You could always run it over to AutoZone and have them run a diagnostic on the computer; might be a code there.
 

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Mine came on once about a month ago and haven't seen it since. There is a TSB out there for 08's that might be related...

Component Description:
17. POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT Bulletin Number: 08-04-21-003
Bulletin Date: APR 2008

Vehicle: 2008 GMC Acadia
Summary:
SERVICE ALL WHEEL DRIVE AND/OR ALL WHEEL DRIVE OFF MESSAGE DISPLAYED IN DIC, DTC C0394 SET (INSPECT REAR DIFFERENTIAL WIRING HARNESS AND REPAIR, IF NECESSARY). ( NHTSA ITEM NUMBER - 10025349 )
 
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