If your tailgate system stopped powering up. A few things to check. If you have recently connected a trailer to the 9 pin trailer plug. Check the fuse under the hood for the constant 12v power to trailer. If it is good there is a smaller fuse under the truck around the rear licenses plate. If all of them are good. The next thing to check would be the position switch that senses what position the tailgate is in. To test you will need to remove the cover or baffle. once inside the gate make sure it is opened to fully so you have to have the second gate open also. Then check power at the amp. If you have power it could be a bad amp. If you do not have power its the position switch. Once you figure that out its simple to fix. Your system if purchased through a GM authorized dealer you have an incredible 3 year / 36k mile warranty through any GM dealer in the country. Even covers the labor under warranty.
