airbusdriver

Just ran into same thing with trailer lights. 2013 suburban trailer lights work on 4 place snowmobile trailer. When I try it with my 2020 GMC 2500HD AT4 I get no trailer connected. Brake controller works but no trailer lights on trailer work. This is the first trailer I have had an issue with on the GMC. I purchased truck used in May 2021 and it just turned over 30,000 miles, 36 month warranty just ended in Sept. The dealer is going to try a new light module except it will take a week and I wanted to pull the snowmobile trailer this weekend. No quick fix. Going to try either putting in LED lights and or unplugging some of the marker lights to get trailer draw down to work some of the lights.

Just ran into same thing with trailer lights. 2013 suburban trailer lights work on 4 place snowmobile trailer. When I try it with my 2020 GMC 2500HD AT4 I get no trailer connected. Brake controller works but no trailer lights on trailer work. This is the first trailer I have had an issue with on the GMC. I purchased truck used in May 2021 and it just turned over 30,000 miles, 36 month warranty just ended in Sept. The dealer is going to try a new light module except it will take a week and I wanted to pull the snowmobile trailer this weekend. No quick fix. Going to try either putting in LED lights and or unplugging some of the marker lights to get trailer draw down to work some of the lights.