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Most brake controllers take up room and clash with the dash, but this one tucks completely out of sight under the dash. The main unit measures just 3-3/8" long x 3" wide x 7/8" thick, so nothing sticks out or gets in the way of your knees or airbags. You keep a clean, factory look while still getting full proportional braking control.
No need for extra knobs or displays. This controller connects to your smartphone by Bluetooth so you adjust settings right from the OneControl app—set max brake output, dial in sensitivity, or hit manual override with a big on-screen button. Once paired, it keeps working even if Bluetooth drops, using your last saved settings. The app runs on Apple 5.0 and newer or Android 4.3 and newer, and it can store multiple trailer profiles so you’re always ready to hook up and go.
The built-in 3-axis accelerometer measures how fast you’re slowing down and matches the trailer’s braking power to it. Ease onto the pedal and your trailer eases in; hit the brakes hard and it responds instantly. It works with trailers that have 1 to 4 axles (8 brake assemblies) and supports electric trailer brakes for steady, even braking on any load.
Wiring is simple thanks to the custom harness that plugs into your vehicle’s factory port. The unit mounts anywhere under the dash with adhesive backing or zip ties—no drilling or cutting needed—and automatically calibrates once connected. Built-in reverse polarity and short-circuit protection keep it safe during setup and towing. In just minutes you’re paired, calibrated, and ready to tow confidently.
If you tow more than one trailer, saving profiles in the app is a big time saver. Just pick the trailer name on your smartphone and your preferred output, sensitivity, and hazard settings load automatically. Whether it’s a boat one weekend or a utility trailer the next, your brake setup is always dialed in exactly how you left it.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Customer Satisfaction Score:
85% were satisfied with this product
15% of customers were not satisfied
Ratings & Reviews
Eric
8/27/2025
Brake controller still performing flawlessly after a year of use. Controller sees usage on average 2 times a week and has been across the country several times. On phone app is easy to navigate and use while driving. This model is a perfect addition to a vehicle without a factory installed brake controller. I have it installed in an Infiniti QX80 so it will work in this model as well as a Nissan Armada. Having the unit hidden under the dash is nice. This vehicle really has no available space for placement other than under the dash board. Excellent product!
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.
Bri
6/7/2017
One year later and unlike my guitar hero drum kit the insulation on the wires has not cracked and fallen off yet. Plus its nice to be able to unplug the unit from the car.
Laura E.
11/8/2017
Thanks for pointing this out, Russell. The factory brake controller plug on some vehicles primarily XE models do not have the 4 pins to match up with the adapter plug. The factory plug will need to be hardwired onto the brake controller adapter that was purchased.
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Kenny
9/6/2017
ITS BEEN A YEAR SINCE INSTALLATION, ITS BEEN IN THE SAME LOCATION, HAVENT HAD ANY PROBLEMS! GREAT PRODUCT, GREAT PRICE!