Has anyone ever been sitting at a light and heard a tone sound for a few seconds? No warnings or anything on the cluster or display, happens occasionally completely at random but not too often. Car is a 2007 Continental Gt just finished 4 year service at Bentley dealer and no issues found.

 

Very rare, but yes. Like you said, no warning lights and i know it is not the outside temp change to snow. Still, only once or twice in the past year.

 

Mine emits a double, high/low, tone quite often after startup. I eventually realised that it is the phone coming on charge. At least that's what I think it is.

Les.