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Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional
Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

Part Numbers: C24VV,C51522

Retail:$223.69
Our Price: $152.85
You Save: $70.84
Trailer Brake Controller

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Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional
part number: C24VV

Simple and compact, this proportional brake controller has an intuitive design that's easy to use. Includes a simple digital display, 10 gain settings, a pinch-trigger manual override, and built-in safety features.

Features:

  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
  • Simple digital display shows you the braking and sensitivity settings as well as error codes
  • Intuitive controls keep settings within easy reach
    • 10 Levels of boost let you adjust initial braking power and aggressiveness for smooth, safe braking
    • Pinch-trigger manual override allows you to control trailer sway or stop in emergencies
  • Triple-axis, motion-sensing accelerometer provides highly responsive, smooth stops
    • Automatically increases power when going downhill and decreases when going uphill
  • Integrated safeguards protect your vehicle, the trailer, and the controller
    • Runs continuous diagnostic checks to alert you to any potential problems
    • Minimizes drain on car battery by entering sleep mode after 5 minutes of inactivity
    • Keeps trailer brakes from overheating by reducing power output to them during prolonged stops
    • Defends brake controller and trailer breakaway systems against shorts
    • Prevents positive and negative power reversal with built-in polarity protection
  • LED display shows power adjustments in 0.5 increments
    • Brightness is adjustable for optimal visibility
  • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Automatic leveling lets you mount at any angle
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used to reduce installation time on certain vehicles


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
  • Dimensions: 4" long x 3-1/8" wide x 1" tall
  • Limited lifetime warranty


LED Display

The LED display on the TriFlex is large and easy to read at a glance. It will show you what setting the brake controller is on as well as give you information for troubleshooting. You can adjust the screen brightness or trigger night mode so it won't glare obnoxiously on your dash.


To change any of the settings, press the silver mode button on the front of the brake controller and which mode you are currently on will show on the LED display. When you're on the setting you want to adjust, use the black rocker switch next to the mode button to adjust it up or down.


Gain Adjustment

Gain control lets you set the maximum amount of power that will be applied to your trailer's brakes, adjusting in increments of 0.5. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to go as high as you can without the trailer brakes locking up. Typically, the gain is only readjusted when you experience changing road conditions or if the weight of your trailer changes. To get more power to your brakes, press the upper rocker switch. To decrease the gain, press the lower switch. When you make your adjustment, the gain setting will show on the LED screen for 10 seconds and then go into sleep mode.


Load Control

Once you have the gain set, you can fine-tune your braking by adjusting the load control on a scale of 1 to 9. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. Load control can get the braking power to your trailer faster and with more intensity so that it doesn't push your tow vehicle forward. If your vehicle takes too long to come to a stop, increase the setting by pressing the upper rocker switch. If it stops too abruptly, decrease the setting by pressing the lower switch. You can alter the setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads.


Pinch-Trigger Manual Override

The TriFlex comes with a easy-to-reach, pinch-trigger manual override, great for stopping sway or controlling your trailer's momentum in emergencies. To engage the manual override, just push in the trigger. This will activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.


Safety Features

The TriFlex offers key safety features to prevent damage to various components of your towing setup. This starts with built-in protection against shorts and positive and negative power reversal, as well as continous diagnostic checks to alert you to any potential problems as they come up. To minimize the drain on your vehicle's battery, the TriFlex will automatically go into sleep mode after 5 minutes of inactivity. Sleep mode will turn off again the moment you press the brake pedal.


Curt TriFlex NEXT

Quick Installation

Automatic leveling means you can mount the unit at any angle. Your mounting options are limitless, so long as you can still easily access the controller and the manual override. The included bracket is designed to mount the brake controller flush to the dash so it takes up almost no space at all.


If your vehicle already has a plug-in brake controller wiring harness, just connect the unit to it. Otherwise, you will need to purchase a vehicle-specific wiring harness (sold separately) to plug into. If a harness is unavailable for your vehicle, hardwiring will be necessary.


Note: If a custom brake control wiring adapter is not available for your vehicle, one of the following will be required:

20-Amp circuit breaker (9506P - sold separately) for 2- to 4-brake applications

30-Amp circuit breaker (38630 - sold separately) for 6- to 8-brake applications


See also etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.


Proportional Braking

What is proportional Braking

The Curt TriFlex NEXT brake controller comes equipped with proportional braking to give you the best towing experience. Proportional braking means that your trailer brakes mimic your tow vehicle's brakes. If you slam on the brakes in your vehicle, your trailer brakes will activate with the same intensity; if you brake lightly, your trailer brakes lightly too. The trailer's braking is in proportion to your vehicle's braking. This saves wear and tear on the tires and the brakes on both your vehicle and trailer.


The TriFlex uses an internal 3-axis accelerometer to sense how your vehicle is braking so it can send the right amount of braking power to your trailer. It measures the inertia of your tow vehicle and activates the trailer's brakes to slow at the same rate. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.



51146 Curt Tri-Flex NEXT Proportional Trailer Brake Control

Replaces Curt 51140



Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In
part number: C51522

Install your Curt electric trailer brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in port beneath your vehicle's dash.

Features:

  • Plug-in wiring adapter allows for quick, simple installation of your electric trailer brake controller
  • No cutting or splicing required
    • Custom connector end plugs into the built-in port beneath the dash of your vehicle
    • Other end plugs into the back of your electric brake controller
  • Compatible with time-delayed and proportional brake controllers from Curt
    • Brake controller must have built-in plug for adapter to connect - will not work on controllers with pigtail wiring harnesses
  • 2' Long, 12-gauge wires have protective covering to deter damage
  • Limited 1-year warranty


Installation of Curt Brake Controller Adapter

To install your Curt electric brake controller, you need to connect the wiring of the controller to your vehicle. Certain auto manufacturers offer pre-wired options, typically known as tow packages, wherein wiring is run for you from the dash to the trailer connector on the back of your vehicle. When this is done, a port is installed at your dash so that you can easily plug in a brake controller.


This adapter plugs into the port on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, and it is taped to another harness near the emergency brake pedal.


No hardwiring is required to install this adapter. After you plug it into the factory port, you simply plug the other end of the adapter directly into your electric trailer brake controller. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time to transfer it to another vehicle or securely stow it away.



51522 Curt Quick Plug Brake Control Adaptor Harness

California residents: click here




Customer Satisfaction Score:


Customer Reviews

Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional - C24VV

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In - C51522

Average Customer Rating:  4.6 out of 5 stars   (68 Customer Reviews)

Simple and compact, this proportional brake controller has an intuitive design that's easy to use. Includes a simple digital display, 10 gain settings, a pinch-trigger manual override, and built-in safety features. Install your Curt electric trailer brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in port beneath your vehicle's dash.

by: Lee04/22/2024

Arrived as planed and was much smaller then my old clunky one. The custom cable harness was easy to install. Finding a flat spot to mount the controller took the longest to find the perfect spot. I gave a five stars because every was as it said. (Plug and play)



by: Thomas 05/19/2024

Excellent product. Easy install. Customer service was exceptional with real-time communications every step of the way. Highly recommend e-trailer for any of your trailering needs.



by: Loren 05/14/2024

Excellent product, easy installation just as described. Good quality as expected from E trailer.



by: Walter06/07/2024

All the information I needed was on your site. Got the correct adapter cable and was able to just plug in the controller.



by: Chris03/29/2024

The product I ordered was not available. There was a suggestion for another product, without the full knowledge that there are multiple other products, and I was only given one choice. It is what it is, if I knew of options, I would’ve made a different choice. Not a great company in terms of knowledge and service



by: Adam 02/07/2024

The control works great. The reason for knocking off a star is that the control rattles whenever there is a vibration in the truck. While annoying, it doesn't affect the operation.



by: Dennis 02/11/2024

I have not used this device yet but I have installed it. It looks kool. I hope installation orientation doesn't matter too much.



by: William03/30/2020

This made for an easy plug and play installation—and even included instructions for removal is the lower dash trim panel in my Audi.



by: Barry12/02/2022
Audi

This brake controller works perfectly for my 2014 Audi Q7! The instructions were easy to follow thereby making the installation a straightforward process. The hardest part was deciding where to install the dial. The dial has a solid and deliberate feel when turning and numerous options for fine tuning.



by: Henry 03/15/2024

The service and speed of delivery has always been great, thank you E Trailer.



by: Dan 03/29/2024

Never a problem with etrailer



by: Mitchell05/20/2024

Josh was excellent in listening and helping discuss my options. The trailer brake improved my driving and safety tremendously with a 14k dump trailer. Thanks, Josh.



by: Frank 04/20/2024

Extremely easy to install and small enough to not be in the way. Works great as well….highly recommend.



by: Mike05/28/2024

Scratched screen straight out of the package/from the factory. Haven't installed yet. Super fast shipping!!



by: Craig 05/14/2024

As advertised- very easy to install!



by: Shea06/17/2024

Easy set up, great customer service!



by: Todd03/13/2024
2019 Volkswagen Atlas

The product was exactly what was required for the job. Was disappointed in shipping since I paid extra for expedited shipping and it arrived a day later than expected. I could have got it in the same time frame and saved $XX.00.



by: Tom 04/09/2024

Was easy to install and works well.



by: Mickey 04/20/2024

Good ..except for shipping thru mail.



by: Damon 04/09/2024

Couldn’t get any easier to install. Took less than ten minutes.



by: Chris 04/05/2024

Everything got here fast, and looks to be exactly what I need. Thank you!



by: Richard 03/28/2024

I have not installed it yet, but it looks good and thank you for the fair shipping Richard



by: Bill 03/13/2024

Perfect communication and quick deliver y!



by: Tim 10/13/2023

Works good, just installed, trailer brakes smooth and as it should.



by: John 03/13/2024

Great fit works as described


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Ask the Experts about this Trailer Brake Controller
Do you have a question about this Trailer Brake Controller?


  • How To Install Curt Brake Controller On 2018 Jeep Cherokee with Tow Package
  • The Curt TriFlex Trailer Brake Controller part # C24VV with Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51459 is an excellent option for a 2018 Jeep Cherokee with tow package. The brake controller will mount on the dash within reach and then the custom adapter will plug into the rear of the controller and then the tow package port on the vehicle which is located underneath the dash, just to the left of the steering wheel, taped to another harness near the emergency
    view full answer...

  • Which is Better Curt Brake Controllers or Prodigy Brake Controllers
  • The Curt brake controllers aren't my favorite ones to recommend as they have a tendency to have reliability issues across basically all models from them. The brake controller I recommend is the Prodigy P3 part # 90195 because this brake controller senses the amount of braking your tow vehicle is applying and puts a proportional amount of braking on the trailer's brakes. It also has a display that uses full words instead of codes that would have to be deciphered. It's our best selling
    view full answer...

  • What Does an OL Error on the Curt Triflex Brake Controller Mean?
  • The "OL" error code on the Curt Triflex # C24VV means there is a short in the blue wire output circuit or trailer plug. Basically all you need to do is find the short and repair it. With the noise you are getting at the hitch, I can almost guarantee the short is at or near the 7 Way plug near your hitch.
    view full answer...

  • Trailer Brakes Stop Working with P2 Brake Controller Installed on 2014 Chevy Silverado
  • It sounds like there is a loose connection somewhere, probably along the blue wire that goes from the back of the brake controller to the trailer connecter at the back of your 2014 Chevy Silverado. When they installed the brake controller did they hardwire it in or did they use the vehicle specific harness # 3016? It is more likely there is a loose connection if it is hardwired in. But if they did use the plug check where it plugs into the truck. Look for bent or broken pins at the
    view full answer...

  • Are the Curt TriFlex # C24VV and Curt Adapter # C51453 a Fit for a 2014 Ram 1500 4WD 5.7 Hemi
  • You have exactly what you need for installing a brake controller in your 2014 Ram 1500. Brake controllers, like your Curt TriFlex # C24VV, aren't necessarily vehicle specific, but the plug-in wiring adapter harnesses are. The correct one for your 1500 is the Curt # C51453 that you referenced. This will plug into the port under your driver side dash and allow you to easily install and remove the controller when needed.
    view full answer...

  • What is Required to Install a Brake Controller in 2019 Toyota Highlander With 4-Way
  • Since you have a 4-way in your 2019 Toyota Highlander you can install a brake controller like the Curt TriFlex Trailer Brake Controller # C24VV with Wiring Adapter # C51515 so long as you use the Universal Installation Kit for Trailer Brake Controller # ETBC7. This has a 7-way to 4-way adapter but that alone isn't enough to install a break controller. This kit also includes the necessary circuit breakers, wire and additional hardware you will need to install a brake controller. I have
    view full answer...

  • Where Is Brake Controller Install Port on 2017 Ram 1500
  • To install a Curt brake controller like the part # C24VV in a 2017 Ram 1500 the correct install harness is the part # C51458. If you check out the install video I attached below you'll see exactly how a similar brake controller installs on a 2017 Ram 1500 like what you have. Fast forward to the 2:30 section of the video to see where the port is found.
    view full answer...

  • Troubleshooting Curt Trailer Brake Controller Coming On Immediately When Brakes are Pushed
  • Your Curt brake controller may have had the sensitivity adjusted to the maximum setting without you knowing. If the sensitivity is increased to maximum it may cause the issue that you are having. On a Curt TriFlex Trailer Brake Controller # C24VV this adjustment is made with the switch on the back left of the brake controller. When you adjust the sensitivity it has a range of L1 to L9 with L9 being the most aggressive activation. If the sensitivity and output are set at their correct
    view full answer...

  • Curt C24VV Brake Controller Troubleshooting Reading Voltage Numbers without Trailer
  • Most likely it's just corrosion on the trailer wiring connector confusing your TriFlex part # C24VV into thinking that a trailer is connected so first try cleaning that. If not this controller is prone to internal bugs so you might try unplugging it and plugging it back in to reset it.
    view full answer...

  • Low Voltage and Weak Brakes on Trailer
  • In order to test the Curt TriFlex Trailer Brake Controller part # C24VV, you will want to first turn the gain up to the maximum settings which on this controller is signified by "L.9" and "9.9". Once you have done so you will then need to sever the blue brake output wire about 6" from the back of the controller. Apply the manual override and and test the wire with a multimeter like part # PT89ZR. You should be getting a full 12 volts or close to it once the above has been completed. If
    view full answer...

  • Curt TriFlex Brake Control Shows Settings When Not Connected to Trailer or Locks Up Trailer Brakes
  • It sounds like the sensitivity is set high. The closer the sensitivity lever is to the driver, the more aggressive the brakes will be. There could also be a short in your vehicle side trailer connector. Check the vehicle and trailer side connectors for any dirt or corrosion inside and out. A short could cause some of these problems and others. Another possible problem is how the controller is mounted. The controller can only be mounted 70 degrees nose up or 20 degrees nose down.
    view full answer...

  • Troubleshooting Curt TriFlex Brake Controller Showing Flashing DC And Locking Brakes
  • I reached out to my contact at Curt and the DC flashing on your Curt TriFlex Trailer Brake Controller # C24VV is showing that your trailer is disconnected from the brake controller. This code is telling you that there is an issue between the contoller and your trailer brakes, that there is a short somewhere. This could be corrosion at the connection, a nick in the wire somewhere or a short on the trailer itself. I recommend checking your controller first. Using an incandescent circuit
    view full answer...

  • Will Curt TriFlex Brake Controller Allow 2020 Ram 1500 Classic to Operate Brakes on Travel Trailer
  • Yes, the Curt TriFlex Trailer Brake Controller # C24VV will work for your 2020 Ram 1500 Classic to operate the brakes on your Northtrail NBH24 travel trailer. You will need the Wiring Adapter # C51458 to plug and play the controller into your factory 7-way wiring.
    view full answer...

  • Installing Curt Tri-Flex Brake Controller on 2002 Chevy Silverado 2500
  • Brake controllers are not vehicle specific, but their wiring adapters are. The # C51342 wiring adapter would be the correct adapter for installing a brake controller into your 2002 Silverado. The adapter would plug into the convenience center under the dash as shown in the help article I linked you to. If your Silverado has the OEM 7-way, all you should need to do is plug the controller into the convenience center and attach the mounting bracket to the underside of the dash. If not,
    view full answer...

  • Correct Brake Controller Plug for Curt Brake Controller on 2013 Dodge Ram
  • If you have a Curt trailer brake controller like the Curt TriFlex Trailer Brake Controller part # C24VV then you'll use the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51453 to install this on your 2013 Dodge Ram which offers a direct plug-in installation.
    view full answer...

  • Troubleshooting False Brake Output Readings On Curt TriFlex Controller While Driving Without Trailer
  • If you are seeing false readings on the Curt TriFlex Trailer Brake Controller part # C24VV, I recommend a simple reset first which can be done by unplugging the controller. If the issues still persists then you can try cleaning out the trailer connector pins. The next step would be to check the wiring and then replace the brake controller.
    view full answer...

  • Solution for Curt Triflex Brake Controller with Internal Problem
  • I am going to be totally honest with you about the issue you are having with your Curt Triflex part # C24VV. This controller is pretty notorious for having internal issues and causing bizarre behavior like what you described and there's no fix for it aside from replacing the controller. For a replacement brake controller I would recommend the Prodigy P3 Brake Controller part # 90195. This is our best selling brake controller because of how well it works and how easy it is to set up.
    view full answer...

  • Troubleshooting Intermittent Blinking Of L.8 or L.9 On Curt Triflex
  • In this case there maybe a loose connection somewhere that is causing the # C24VV to intermittently blink L.8 or L.9 or another possibility is that this unit needs to be reset. To start that process disconnect power from the unit for up to 10 minutes, that will allow the controller to reset its self. After 10 minutes, plug it back in and see if that worked. If none of the above steps seem to fix your problem then please let me know and I would be happy to help further troubleshoot the
    view full answer...

  • Curt Triflex Brake Controller Displays 05 and Trailer Brakes Not Working with Brake Pedal
  • On Curt brake controller # C24VV there is a 20 display so if the display is upside down is would look like 02 or 05. That message either indicates that a trailer is connected and the brakes are activated or, if it is flashing, that means it is in output adjustment mode waiting for the power output to be adjusted. Try adjusting the power to 2.1 to see if it displays 1.2 or 1.5 and if so then the display is showing upside down. I also recommend cleaning the vehicle and trailer side connectors
    view full answer...

  • Troubleshooting Curt Triflex Brake Controller Displaying Numbers When No Trailer Is Connected
  • Your Curt Triflex # C24VV should not display anything but a single dot when the trailer is not connected. You are getting numbers when your apply your brakes because there is a draw on the brake controller output wire. The controller sees that power draw as a trailer being connected. I recommend you clean your trailer connector on your truck as sometimes dirt or corrosion can cause a small draw from the other pin functions. You can use sand paper, steel wool, or even an old toothbrush
    view full answer...

  • Brake Controller For 2009 Volkswagen Touareg With Factory Tow Package
  • You will need a brake controller for your Forest River travel trailer with electric brakes and for your 2009 Volkswagen Touareg with the factory tow package, there is a plug-in option available from Curt: - Curt Assure Trailer Brake Controller with Dynamic Screen # C49UR - Curt Custom Wiring Adapter for Trailer Brake Controllers # C51522 The Assure # C49UR will give your travel trailer smooth braking proportional to that of your truck so you have a more comfortable, safe towing
    view full answer...

  • Easy to Install Brake Controller for 2014 Audi Q7
  • I have a really easy to install brake controller for your 2014 Audi Q7 that works great and is super convenient but the only way to install a Redarc Tow Pro part # RED44FR is going to be by hardwiring the install. Instead check out the Echo Mobile part # C51180. Basically this just plugs into an active 7-way and once you sync it to your phone it's ready to go. This brake controller is proportional which means it senses the amount of deceleration your tow vehicle is applying and applies
    view full answer...

  • Plug-In Brake Controller Adapter for a 2018 Audi Q5
  • I do have a really great alternative brake controller solution for your 2018 Audi Q5 but none of the top brake controller manufactures offers a plug-in brake controller adapter harness like the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51522 for this vehicle yet. Therefore, you have two options which are to hardwire your own harness in or use a wireless brake controller. If you wish to hardwire your own harness in then you will need to cut the factory plug off the
    view full answer...

  • Install Harness for Redarc Tow Pro Elite Brake Controller 2012 Volkswagen Touareg
  • The recommended install harness for the Redarc Tow Pro Elite part # RED44FR to install in your 2012 Volkswagen Touareg is the Curt # C51522 which would match color for color when you wire it to the Redarc controller. So yes, you'd just need to match the colors and you'd be good.
    view full answer...

  • Plug-In Harness to Install Tekonsha Brake Controller on 2017 Audi Q5
  • You are correct that Tekonsha does not currently have a plug-in wiring harness available for your 2017 Audi Q5 but you're also right that you can simply cut off the brake controller end of the Curt # C51522 and hardwire it to the pigtail on your Tekonsha Prodigy P2 # 90885 for installation. You will then still be able to use the vehicle-side plug to connect to the factory port behind the dash of your Audi Q5. After cutting off the controller-side plug on the harness the wires will splice
    view full answer...

Info for these parts were:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Kristina F
Written by:
Kristina F

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