One problem related to tail light switch has been reported for the 2004 Chevrolet C/k 2500. The most recently reported issues are listed below.
Light bulb sockets allow slip-in type bulbs to slip out . Gm has not recalled these sockets, however they have improved the current design so as to hold the bulbs more securely. The turn signals, stop lights and tail lights ,as well as the headlights are affected by this deficiency.