Audi a4 transmission moduel error????

Hi. I'm having a problem with my audi a4 1997. The car is automatic and will not shift into overdrive. Would you be able to find out why? Also the lights on the dash that indicate which gear you are in from (park) "P" to (drive) "D" are all lighten up. Why is this?

Please send me a message I would really like to find out what this problem is.