Remote start does not work
 

The remote start on my 2010 GMC 2500HD does not work. The doors lock and unlock with the fob but nothing happens when the lock plus start button is pressed. It worked fine the previous day. There are no codes present and remote start is turned on in the DIC. None of the reasons the manual says will disable it are present. Looked for a specific fuse but did not see one just for the remote system. Any help would be greatly appreciated as the closest dealer is over 300 miles away.