I was tuning a (2004 Cavalier)car today and everything was fine. I went to connect to a (2016 Silverado) truck and couldn't get the vehicle to connect to the interface. I tried connecting it back to the car and had nothing. On the truck, without the usb connected to my laptop, the green power light is very dim. On the car there is no light at all. I have inspected the pins on both ends of the OBDII connector and they all look good. I also tried another truck (2015 Silverado) and got a very dim light. Could the issue be a bad cable?