I would guess that it is a "safe mode". I did a little search and found this, not sure if it will help.
http://www.plymouthlaser.com/tcucodes.htm All you need is a multimeter.
I know similar problems have been gone over on this forum before so it might not be a bad idea to search the archives here. The other thing you could do is search
www.dsmtuners.com , I think they have a AT specific section.