bing tracking image

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,C51312

Retail:$191.60
Our Price: $135.74
You Save: $55.86
Trailer Brake Controller

zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me



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: C51312

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.



51312 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 - C51312

Average Customer Rating:  4.7 out of 5 stars   (45 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: 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: Henry 03/15/2024

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



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: Dan 03/29/2024

Never a problem with etrailer



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: Tom 04/09/2024

Was easy to install and works well.



by: Mickey 04/20/2024

Good ..except for shipping thru mail.



by: Tim 10/13/2023

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



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: Adam 09/30/2023

Hey guys thanks for all the help.
I submitted
a couple of questions that were quickly answered and Jon gave me a couple of suggestions that I did wind up choosing. They even came with detailed directions for my paticular truck.
Thanks again for the awesome service and help



by: John 03/13/2024

Great fit works as described



by: Domenico11/29/2023

install is a breeze!



by: Harold 12/16/2023

She was great



by: Pat M11/18/2016

Etrailers catalogue provided a complete & accurate description of the 8 items purchased. Placing the order by phone was fast & efficient. Items arrived within 4 working days, no tax no shipping charge. Professional all around.



by: James 03/27/2020

Made my life easy. Plug in my controller and go.



by: Chris09/01/2017

Awesome .Plugged right in to the truck harness no problems came the day they said it would I can haul right on schedule. Thankyou.



by: Jeff09/11/2019

Very easy to install and use. The adjustability is awesome and again easy to use. I would recommend this item.



by: Tod R10/29/2016

Customer service as extremely helpful in making sure I got the right product. I received he item quickly.
Thank you.



by: SHEM W.03/11/2016
2010 Ford F-250 Super Duty

NICE WELL BUILT PRODUCT, PLUGGED RIGHT IN TO MY 1993 FORD F250, 10 MINUTES TO INSTALL.



by: Joe S.08/07/2017

Product made install fast and easy.


25
45
Show More Reviews

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


  • How to Reset a Brake Controller
  • To reset the Curt TriFlex Trailer Brake Controller item # C24VV you will just want to unplug the controller itself. I made a diagram to show you what you will need to unplug. Disconnect this wiring harness and count to 10 and that will reset your brake controller. Make sure you pull at the plugs not on the wires or you will rip them out.
    view full answer...

  • Troubleshooting Curt TriFlex Brake Controller Installation on 2018 Chevy Silverado 1500
  • Wow, you've really done a thorough job at testing the functioning of the Curt TriFlex # C24VV and Wiring Adapter # C51451 on your 2018 Chevy Silverado 1500. The only other thing I can think to do is check the 7-Way on the back of your pickup. If the pins are corroded or the wiring is messed up inside the 7-Way connector then that would explain why you're getting the OL code. It's possible that some wires are crossing which would also explain why your brake lights are remaining on until
    view full answer...

  • Brake Controller Recommendation for a 2000 Mazda B Series Pickup
  • I recommend using the Curt TriFlex Brake Controller # C24VV with the Pigtail # C51515 for your 2000 Mazda B Series Pickup. I like this brake controller because it is a cost-effective proportional controller that comes with a limited lifetime warranty. You could possibly have some sort of OEM wiring under your driver's side dash if your pickup came with the factory tow package but I'm not entirely sure. If you can't find any wiring then we need to add some so you can control the brakes on
    view full answer...

  • Brake Controller with Plug-In Adapter for 2020 Ram 1500 With Tow Package
  • There are absolutely plug-in wiring adapters for a brake controller for your 2020 Ram 1500, and what you can use is the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51458 Then for a brake controller that doesn't take up a lot of space use the Curt TriFlex NEXT Trailer Brake Controller # C24VV.
    view full answer...

  • Why Does the Curt TriFlex Show Power Figures Without a Trailer Connected
  • According to the owner's manual for the Curt TriFlex Trailer Brake Controller part # C24VV, the controller will display output settings without a trailer connected. I have attached for you below an excerpt from page 5 that explains this. "The maximum output setting is shown on the display when a trailer is connected and the brake pedal is pressed or the manual control is actuated. If a trailer is not connected the output setting is flashed when the brake pedal is pressed or the manual
    view full answer...

  • Resetting Curt TriFlex Trailer Brake Controller With Unknown Display
  • I called my contact at Curt about the Curt TriFlex Trailer Brake Controller, part # C24VV. They told me that you should disconnect the power to the unit and leave it disconnected for 15 or so seconds and then plug it back it. It should recalibrate itself and work fine after that.
    view full answer...

  • Troubleshooting Curt Triflex Trailer Brake Controller Having Gain Numbers But Brakes Not Working
  • To determine if the issue is within the controller itself or on the trailer side of things, I recommend using a circuit tester like # PTW2993 to test the 5 o'clock pin on the 7-way connector while a friend applies the manual override of the controller. If you have power then the issue is on the trailer side, and if there is not power then the issue is between the 7-way and trailer brake controller on your 2009 Ford F-150. Since you are getting the gain number on your Curt Triflex
    view full answer...

  • How Does Curt Triflex Brake Controller Unplug to Reset
  • On the backside of your Curt Triflex part # C24VV trace the wiring for about 8 inches and you'll come to a plastic harness that you'll need to unplug. Once you wait a few seconds go ahead and plug it back in.
    view full answer...

  • Trouble Shooting a Malfunctioning Curt TriFlex C24VV
  • This sounds like it could be one or two things. If the initial set up was not done properly, you will simply need to unplug the controller, plug it back in, and then run through the set up process again. This can be kind of tedious, but is an important step. If running through the set-up process again does not get it running properly, you will need to check the output from the brake wire when the manual override is engaged using a tester like the Draw-Tite # PTW2993. This will the blue
    view full answer...

  • Troubleshooting Curt Brake Controller Triflex that Shows Flashing 0.0 on Display without Trailer
  • The Curt brake controllers are notorious for needing to be reset frequently to get rid of bugs like you described. Try unplugging the harness from the back of the controller and then plugging it back in to see if that takes care of the issue. I'd recommend going to a more reliable controller though like the Brake EVN # TK63VR as this is a very solid option.
    view full answer...

  • Harness Needed To Install Curt Brake Controller On a 2015 Chevy Silverado 1500
  • In order to install a Curt TriFlex Trailer Brake Controller part # C24VV on a 2015 Chevrolet Silverado 1500 you'll need the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51451. It will indeed plug into a port under the dash making for a no-splice install.
    view full answer...

  • Troubleshooting Two Dashes on Curt TriFlex Brake Controller
  • The two dashes you are seeing on your Curt TriFlex # C24VV brake controller indicates a wiring issue, either with the power or ground wires. Take a look at the wiring going from the brake controller to your battery - both the black wire going to the positive post and the white ground going to the negative post and ensure there are no damaged wires or issues with your circuit breakers and this should remedy the issue.
    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...

  • Troubleshooting Curt TriFlex C24VV Not Getting Power After Changing Vehicle Battery
  • I am sorry to hear that. By chance was the Curt TriFlex Trailer Brake Controller # C24VV hardwired into your 2003 Lincoln Navigator? If so there is a power wire running from the controller to the battery and it more than likely did not get reconnected which is why the controller no longer has power. If your controller was installed using a plug in wiring harness then you need to check the engine bay fuse box for a blown fuse as that would be the next most likely cause. Let me know
    view full answer...

  • Troubleshooting The Curt Triflex Brake Controller On A 2017 GMC Yukon
  • You will first need to determine why The Curt Triflex Controller # C24VV is not working. You will need to check the correct fuse that corresponds to the brake control and its power supply. In the under hood fuse block (located near battery) fuse 36 is what you need to check. After checking if the trailer brake fuse is intact, you should then acquire a hook probe circuit tester # PTW2993. When the vehicle is on you will want to test the power wire (black) running into the controller.
    view full answer...

  • 2000 Chevy C3500 Brake Controller Recommendation
  • To add a brake controller to your 2000 Chevy C3500 I recommend the Curt TriFlex NEXT Trailer Brake Controller # C24VV which is a traditional style proportional controller that's backed by a limited lifetime warranty so it's really hard to beat the control and reliability of this controller. For the wiring you'll need a 4-Way connector, like the T-One # 118315, as well as the Universal Wiring Kit # ETBC7. This comes with all of the wiring and connectors you need to get a fully functioning
    view full answer...

  • Parts Needed to Install Curt Triflex Brake Controller on 2013 Nissan Frontier W/O Trailer Wiring
  • The only change you would want to make is that instead of the Universal Wiring Adapter for Curt Brake controllers # C51515 you would have wanted to get the Curt Custom Wiring Adapter # C51382. This will make the installation of the Curt Triflex Brake Controller part # C24VV simple. All you would have to do is plug one end of the connector into the back of the brake controller and the other end to the harness that is located underneath the dash, to the left of the steering column, and
    view full answer...

  • Troubleshooting OL Code On Curt TriFlex Trailer Brake Controller W/ Trailer Unhooked
  • Since your Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional # C24VV you have is showing OL (overload) code even when trailer is unplugged that means that there is a short in the blue trailer brake output wire. I recommend cutting the blue wire of the # C51362 you have installed in the factory trailer brake port of your 2011 Tundra. If cutting the wire makes the code go away then there is a short somewhere between the trailer brake controller and the 7-way connector
    view full answer...

  • Curt C24VV TriFlex Brake Controller Putting Out Minimal Voltage With Vehicle Brake Pedal Applied
  • The Curt # C24VV Triflex is a proportional brake controller, which means that there are internal sensors that can determine how quickly the tow vehicle is stopping, at which time the controller will send the appropriate amount of voltage to the trailer brakes so the vehicle and the trailer will brake at the same rate. When the vehicle is NOT moving, you'll get very little voltage out of the controller with the vehicle brake pedal, just enough so the controller 'knows' there's a trailer
    view full answer...

  • Which Trailer Wiring Harness do I Need for a 1992 Ford F-350
  • The Curt Custom Wiring Adapter # C51312 is correct for you 1992 Ford F-350 if your truck has the factory installed tow package. If it does not, then you will need the Curt Universal Wiring Adapter # C51515. You will also need the Universal Installation Kit for Trailer Brake Controller - 7-Way and 4-Way Flat # ETBC7 and the Curt T-Connector Wiring Harness with 4-Pole Flat Connector # C55316 if you do not have the tow package. I have included video reviews of each wiring adapter for
    view full answer...

  • Recommended Brake Controller for 2023 Jeep Grand Cherokee With Factory Tow Package
  • It sounds like you're looking for a brake controller recommendation to go with the Curt Custom Wiring Adapter for Trailer Brake Controllers # C51312 for your 2023 Jeep Grand Cherokee with the towing package. The Curt Custom Wiring Adapter for Trailer Brake Controllers # C51312 is actually not the correct wiring harness as this is meant to work with select Ford Bronco's as well as select Ford F-150's, 250's and 350's. Instead, since there is not a vehicle specific harness you'd then
    view full answer...

  • Parts Needed to Install Brake Controller In 1993 Ford F-350 with Factory 7-Way
  • If your 1993 Ford F-350 has a factory 7-way installed you could use an under-dash install harness like the part # C51312 to install a controller like the Curt Discovery part # C51120. The harness would be under the dash taped to another harness near the emergency brake pedal. Otherwise to hardwire to you current 7-way the kit you'd need is the # 5506.
    view full answer...

Info for these parts were:

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

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.