Well, if I cannot determine what the problem is, then I will do that. But, I was hoping maybe someone who has experience installing this kit in their silverado might have some pointers. Perhaps someone has experienced this exact same problem and knows what the issue is? I'm 100% certain the CEL is related to my installation of the HID kit. So something is disconnected, or there is some other issue. Unfortunately, I have to wait until Monday to get on the phone with The Retrofit Source technical support.