I have a 2003 avalanche 2500 with the driver 1 and 2 keyless. When I bought it the keyless worked fine, I never had the driver 1 remote just the driver 2. Anyways I had to replace the battery in the remote and reprogrammed it fine. That worked for a few weeks and then it just stopped. Tried reprogramming it and it won't. Brought it to the dealership and they tried a differant remote and still couldn't get it to work. (Didn't have them try anything else they were trying it out of a favor and I didn't want to pay them for troubleshooting.) Is there a module that might need replaced? Anything else to check? The remote they tried with was the same part number, but was used had a brand new battery also.