My 2003 Jeep liberty tail light doesn't work

The contacts that your bulb plug into tend to get out of shape or burnt up.... The dash lights also leads me to believe it could be the turn signal/ wipers module going bad.... I'd go through your fuses first but that is likely the problem. On your turn signal is a switch that might be the issue with the dash lights. It may have been inadvertently turned off.

I have the same problem. I even replaced the holder and the contacts look like new but only the brake light works.