I think the dealer has to.
Dealer will have to do this.
if the batteries went dead you don't have to go to a dealer only if you buy a new remote its quite simple stand near the vehicle and press the lock and unlock buttons on the key fob simutanously until you hear the vehicle door lock unlock and lock a few times should only take about 5 seconds paul
the guy above me had it right. you should not have to reprogram remote. Those remotes are a bit problematic though. Check keylessfix.com they have all the solutions for these gm remotes. especially if a couple of the buttons don't work.
Looking for a Used Montana SV6 in your area?
CarGurus has 133 nationwide Montana SV6 listings and the tools to find you a great deal.
Search Pontiac Montana SV6 Questions
Pontiac Montana SV6 Experts