Service was excellent with one exception. I have asked on more than one occasion about a buzzing noise that seems to come from under my 2019 Silverado as I approach the vehicle and unlock the doors. No one in the service department seemed to know what I was talking about or ever acknowledged that such a sound was commonplace. Eventually I turned to Google to find the source. There I learned that the sound I was hearing was the fuel pump priming in preparation for starting the vehicle. Sounds like this feature was added starting with the 2017 models. How is it that Symdon’s service staff (and sales staff) are unaware or unfamiliar with this feature? Disappointing!