I've been having some oddness with my RKE transmitter and was wondering if anybody else has seen these issues.
First, about a month ago the RKE totally died. I parked the car and when I got out I couldn't lock the doors. The button on the door itself wouldn't work and the remote wouldn't work either. I ended up using OnStar on my phone to lock and unlock the car, and then had to place the RKE transmitter in the spot in the center console to get the car to start. I ended up just replacing the transmitter battery and that fixed the issue. I thought it was strange that the battery had died so quickly though considering the car was only a month old at that point.
So now, about a month later, I just ran into the same issue. Was out shopping and when I got out of the car the door wouldn't lock again. Exact same behavior. Got back in the car and tried to start it and got the no key present warning. I ended up just leaving the car unlocked and went into the store. Came out about 30 minutes later and everything was magically working fine again. So I don't think it was the RKE transmitter battery this time.
Then when I got home I got out of the car, closed the door, locked it with the button on the outside of the door and it locked, but as soon as it locked it did the triple horn honk for some reason. No idea what that was about but the RKE was in my pocket and not inside the car.