How Does Curt Spectrum Brake Controller Install on 2023 GMC Yukon XL

Updated 05/12/2026 | Published 05/09/2026

Products Featured in This Question

Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob - Up to 4 Axles - Proportional

(425)

$328.87

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

(88)

$14.18

Question:

I have a 2023 GMC Yukon XL without factory installed trailer brakes and I’m trying to install Curt Spectrum but I can’t find the factory trailer brake control harness plug. The truck doesn’t have a parking brake pedal nor does it have the ribbed box described in previous posts. Please help!

asked by: Bruce B

Expert Reply:

Hey Bruce, do you have the brake controller install harness part # C51525 to install the Spectrum part # C36QV on your 2023 GMC Yukon XL? I attached an install video that shows where to find the correct place to plug the connector in. Right at the 57 second mark you'll see where to find it. You might also need to scroll down a bit to find the video link.

expert reply by: Jameson C

Don't S.

5/12/2026

Don't do it mine worked great for year and then started draining the battery.. it's china junk so find a usa made .

Jameson C.

5/12/2026

@Don'tS The Curt controller? Yeah we haven't had the best luck with their brake controllers over the years. If you decide to try another one the Redarc Tow Pro Liberty # RED52VR would be a really great option.

Chad N.

5/12/2026

Mine works great!! A little bit of a learning curve to use and get set, but all in all I’m very happy and please with how it works. It is plug and play. Chad