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Most brake controllers clutter up the cab or get in the way of your knees. This one tucks neatly under the dash, using a slim control box just 3-3/8" long x 3" wide x 7/8" thick. With the main unit hidden, your interior stays clean and unobstructed. The built-in 3-axis accelerometer senses travel direction at any angle so it delivers smooth, even braking no matter how it’s mounted.
Instead of another box or knob on your dash, your smartphone becomes the interface. Through the OneControl app, you can set maximum braking output, adjust sensitivity, and apply manual override right from your screen. Once paired over Bluetooth, the connection takes about five seconds and stays stable even if mobile data is off. If the Bluetooth link drops, the controller keeps working safely using your last saved settings.
With proportional control, trailer braking matches how hard you press your vehicle’s brakes for consistent deceleration. An internal 3-axis accelerometer measures inertia and sends the right amount of power to the trailer brakes—light when you ease up, firm when you brake harder. It works with trailers that have 1 to 4 axles (8 brake assemblies) and supports electric trailer brakes for balanced, reliable stopping.
No splicing or complicated wiring needed. The included custom harness plugs directly into your vehicle’s factory brake control port. Mount the control box under the dash with the adhesive pad or zip ties, connect your trailer’s 7-way plug, and let it calibrate—it takes about five seconds until the LED turns green. Built-in diagnostics display status codes through simple LED indicators to make troubleshooting easy.
For anyone towing more than one trailer, switching setups couldn’t be simpler. The OneControl app lets you store and recall multiple trailer profiles so you don’t have to reset brake force or sensitivity every time you hook up a different rig. Just swipe between saved profiles and get on the road faster with all your preferred settings ready to go.
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.
Ray
4/9/2019
PRODUCT WORKS PERFECTLY. JUST WHAT THE DOCTOR ORDERED.
Bob B.
9/2/2015
It works just fine, no problem at all.
Ray L.
5/29/2016
Great product great company!!!
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Greg Z.
3/13/2026
The plug on the interface end does not lock in place and easily falls out of the interface module if bumped. Otherwise works fine.