2001 Silverado 3500 Dually

My remote door opener doesn't work. Battery changed but still no luck.
Panic alarm not working either. Dealer says how much do want to spend while we look.
Any ideas out there? Thanks

If I remember correctly, I had to hold both the lock and unlock buttons down at the same time near the truck so it would relearn the code. I could be wrong, but try that.

Sincerely,
Matt