Cadillac Repair: transmission, caddi, message center

Question
hi.  my 1991 caddi deville will not start in first gear and overdrive.  other than that its fine, why please?  thank you rob

Answer
IS or HAS the CHECK ENGINE light on the dash ever illuminated and or have you seen any messages in the message center ?. If you HAVE, I need to know what FAULT CODES are being stored in the computers IF the CHECK ENGINE light illuminated OR I need to know what MESSAGE or MESSAGES appeared in the MESSAGE CENTER.