So I lost the master key for my Envoy, so I got a new fob and coded key from the dealer. They asked me to come back tomorrow for programming, so I figured I'd do it myself. I put the new uncoded key in the ignition and turned it on - five seconds later the security light went off. I cranked the engine and it fired right up! I tried the 2nd memory key and it fired right up. Am I missing something here?