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Most brake controllers take up space under the dash, but this one hides neatly out of sight. The main unit measures just 3-3/8" long x 3" wide x 7/8" thick and mounts under the dash with an adhesive pad or zip ties. You control everything from your phone over Bluetooth, so there’s no bulky box or extra switches cluttering your interior.
Instead of knobs or buttons, you manage all your trailer brake settings through the OneControl app on your smartphone. Adjust max braking output, sensitivity level, and even use the big on-screen manual override button—all right at your fingertips. The app works without mobile data once downloaded and runs on Apple (5.0 and newer) or Android (4.3 and newer).
If you switch between different trailers, you’ll appreciate how simple it is to save and recall profiles in the app. Each trailer can have its own max output and sensitivity settings stored, so you don’t have to re-tune every time you hook up something different. Just swipe between saved profiles and go.
The built-in 3-axis accelerometer reads how your tow vehicle slows down and matches your trailer’s braking power to it. That means smooth, even stops whether you’re braking hard or easing to a stoplight. It’s compatible with electric trailer brakes on trailers with 1 to 4 axles (8 brake assemblies total).
Setup is quick thanks to the included custom harness that plugs right into the factory tow-package port under the dash. Once connected, pairing over Bluetooth takes about five seconds, and calibration finishes automatically when the LED turns green. Built-in reverse polarity and short circuit protection keep your system safe while towing.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Ratings & Reviews
Jenny N.
3/18/2024
I reached out to Curt about the problems with the new app. They advised that the new app runs the same as the old app it has to run in the foreground unless they are using the button which is the same as the old app. They wanted to know if you were having trouble getting past that screen. Which type of cell phone do you have and which IOS are you using?
Matthew
11/25/2024
Still 5 stars, lots of trips including a long tow of over 5000 miles. Consistently worked flawlessly. Mild annoyance that they changed the app but once I learned how the new app worked it continues to function flawlessly.
Larry M.
2/8/2018
I am very happy with all of my purchases from etrailer. The products are still working fine after a year and your company is very good to work with. Any future needs I have will be purchased at etrailer.
Kenneth
2/12/2025
Still doing exactly what it is supposed to do. My only hint to you is, unless you have a photographic memory, do NOT throw away the quick reference card.
Jameson C.
2/12/2025
John Y.
2/19/2018
perfectly satisfied
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Tommy J.
1/31/2015
After a year of using the Curt brake controller it has been by far the best one of several I have used and installed. i highly recommend the controller.