I recently replaced my PCM in my 2008 Silverado 1500 and ran into an issue with the key relearn process. When following the instructions it seems that upon turning the key to the “on” position the security light should illuminate and stay on. This is not the case for me however as the light just blinks and turns off after a few seconds. Seeing if maybe the light just glitched or something I went ahead and went threw the 10 minute “on” position 5 second “off” position procedure and it didn’t work. Any ideas as to why this might be? The PCM was programmed to my VIN by the seller (flag ship 1) and from the reviews I read it should just be plug and play aside from the VTD process.