lionel TMCC problem

recently purchased TMCC setup with 50th anniversary union pacific set and the hrn, bell reverse direction, brake, smoke buttons intermittantly respond the lights on the unit come on when I press the associated button but over 50% of the time the i get no sounds, reverse of driection etc… i also have a sound dining car in the set which seems to operate flawlessly…do i need to reprogram the engine, any instructions on how to do this?

I really don’t know too much about TMCC myself, but I would highly reccomend posting this topic in the Classic Toy Trains forums. You’ll get much better results.