Troubleshooting Redarc Tow-Pro Liberty Trailer Brake Controller Not Calibrating On 2017 GMC Yukon XL

Updated 02/21/2022 | Published 02/20/2022

Products Featured in This Question

Redarc Plug-and-Play Wiring Harness for Tow-Pro Trailer Brake Controllers

(171)

$27.00

LCD Digital Circuit Tester

(28)

$28.06

Redarc Tow-Pro Liberty Brake Controller - Dash Knob - Up to 2 Axles - Proportional

(2813)

$190.00

Question:

I just finished installing the tow-pro liberty on my gmc yukon xl and when I push the button the blue light comes on so it has power, but when I drive to calibrate it the button doesnt flash green/blue so Im not sure if its all set up or not.

asked by: Mike G

Expert Reply:

The Redarc Tow-Pro Liberty Brake Controller # RED24FR will not always calibrate unless it has a trailer connected. It seems to vary based on the vehicle as not all the trailer systems will work when a trailer is not connected to the 7-way on your 2017 GMC Yukon XL.

Since you tested the controller by pushing the button you know that it does have power going to the unit, and a good ground. Pushing on the brake is what will begin the calibration process when you have a trailer connected. If you do not get any lights when pushing on the brake pedal as you are driving with the trailer connected you may have a bad brake switch or faulty Plug-and-Play Wiring Harness # 331-TPH-010. A Test Light # PTW2992 will allow you to ensure that you are getting power to the red wire on the harness from the brake switch.

expert reply by: Bud M