Troubleshooting Curt TriFlex Brake Controller Showing Overload Error

Updated 04/08/2014 | Published 04/06/2014

Question:

I installed the brake controller on a 2013 Kia Sorento with the ETBC7 kit at the back end. When I finally finished wiring and connected the Curt brake controller and the pigtail harness it calibrates, i make the initial settings of w.0 and L1. I apply brake and I get the Blinking OL message. The manual says this is a short in the Blue wire output circuit or Trailer Plug. What is the blue wire output circuit? Is this on the board inside the controller?

asked by: Scott B

Helpful Expert Reply:

This The OL error you're seeing means that there is a short somewhere in the brake output circuit, which is the blue wire that exits the rear of the controller. The usual cause of this is a corroded or damaged trailer connector, but because this is a recent installation on an almost new vehicle, that's probably not the case.

In the install, you ran the gray two-wire cable from the rear of the vehicle. The white wire in the cable should be connected to the blue wire on the 7-way connector at the rear bumper. This white wire should run under the vehicle, up to the engine compartment, and through the firewall where it connects with the blue wire from the brake controller. Make sure there's no nicks in the wires or no loose connections. I have also linked to our Brake Controller Troubleshooting article.

If the wiring checks out okay, get back with me and we'll look into some other possibilities.

expert reply by: Mike L