Webmay 2, 2021 · this video shows how to correct the annoying service trailer brake system message that randomly appears on your dash while driving. The fix is to. The trailer brake control switch parameters can be monitored with the scan tool while wiggling the circuits/ harness between the chassis control module and switch looking. I believe this is the fix and here’s exactly what i did. Websome customers may experience an intermittent check trailer wiring message and/or a service trailer brake message with dtc c1114 on vehicles equipped with itbc.
