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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,C51312

Retail:$191.60
Our Price: $138.70
You Save: $52.90
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: 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   (61 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: 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: 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: 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: Tim 10/13/2023

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



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: John 03/13/2024

Great fit works as described



by: Domenico11/29/2023

install is a breeze!



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: 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.


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


  • Troubleshooting Weak Trailer Braking with Curt Tri-Flex C24VV
  • Thank you for purchasing your Curt Tri-Flex trailer brake controller # C24VV and matching wiring adapter # C51322 for your 2009 Lincoln Navigator. I am sorry you are having an issue with the trailer braking power being weak. If your voltage readings are taken on the trailer at the brake assemblies, and you are reading 12V there, then chances are that the issue is on the trailer side. The pad tension, which is set with the star wheel adjuster, should be set so that with the trailer jacked
    view full answer...

  • Can Curt TriFlex be Used With 2019 Toyota Highlander
  • So long as your 2019 Toyota Highlander does not have the factory tow package, you can use the Curt TriFlex Trailer Brake Controller # C24VV you referenced. To use it you will need the Wiring Adapter # C51515, T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118449 and Universal Installation Kit for Trailer Brake Controller # ETBC7. If your '19 Highlander has the factory tow package I strongly recommend the Curt Echo Mobile Trailer Brake Controller # C51180 because it
    view full answer...

  • Is Blinking Display for Curt TriFlex Brake Controller Ok When Brake Pedal is Pressed and No Trailer
  • What you are seeing is normal for the Curt TriFlex Trailer Brake Controller # C24VV. If you check out attached cutout from the linked instructions you can see that Curt calls this out specifically in the installation instructions.
    view full answer...

  • Troubleshooting Two Dashes on Curt TriFlex Brake Controller Display
  • On the Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional # C24VV the double dash display means you have a power issue. It can be that you are not getting 12V to the controller, or it can mean your ground connection is bad. You will want to check your brake controller wiring. White is ground and black is 12V power. You can use a circuit tester like # PTW2993 to test these wires.
    view full answer...

  • Troubleshooting Curt TriFlex Brake Controller
  • If your Curt TriFlex Trailer Brake Controller # C24VV is just showing R then most likely you will need to recalibrate the controller. To do this, you can unplug and then plug back in the connector on your trailer. You will know it's recalibrated if ".." appears on the screen.
    view full answer...

  • Where Is The Trailer Running Lights Fuse On a 2014 GMC Sierra 1500
  • For starters, the Curt TriFlex Trailer Brake Controller part # C24VV and Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51451 have nothing to do with the running light circuit. The most likely cause of this issue is a blown fuse on the vehicle. For your 2014 GMC Sierra 1500, the running light fuse is in the #15 position on the fuse box which is labeled as "Trailer Park Lamps".
    view full answer...

  • Troubleshooting 7-Way RV Wiring for Cause of Smoke from Connectors
  • If your 7-way connectors are getting hot enough to smoke then you do definitely have a good ground! Without a good ground not enough power would be passed to heat up your wiring connectors and make them smoke. But clearly there is a circuit problem in either or both the vehicle socket or the RV plug. Since it sounds like the truck's socket does not act up by itself, only when the trailer is plugged in, I suspect the issue to be on the trailer, specifically within its 7-way molded plug.
    view full answer...

  • Curt TriFlex Trailer Brake Controller Shows While Driving
  • If the Curt TriFlex Trailer Brake Controller part # C24VV is showing a "--" in your 2003 Toyota Sequoia while driving then this points to an issue with the power and or ground supply. I would first start off by removing the ground, sanding down the surface, and then reconnecting with new hardware/connectors. Once the ground is checked you will then need to move onto the power wire tracing it back to the battery while looking for breaks. I would also make sure the ring terminal around the
    view full answer...

  • Is Wiring Harness/Adapter Needed to Install Brake Controller on 2017 Chevy Colorado
  • The 2017 Chevy Colorado doesn't use a plug-in connector, but it does have a tow package wiring harness under the dash that the controller would wire directly into. The harness is located behind the driver's side kick panel. The controller would install as shown in the linked video. The pigtail included with the Curt # C24VV TriFlex brake controller would wire up to the tow package harness as follows: • Tow Package Red/Green wire connects to Black wire from brake controller pigtail •
    view full answer...

  • Curt Brake Controller # C24VV on 2012 Honda Odyssey Showing OL Error Code
  • The OL error code you mentioned indicates an short somewhere in the brake controller output circuit between the blue wire exiting the brake controller and the trailer connector. You can confirm this by severing the blue wire behind the brake controller, being sure to leave enough room to reconnect the wire. If this makes the OL code disappear, you have confirmed the short. If this is the case, you'll need to rewire the output circuit, using 10 gauge wire like part # 10-1-1. Chances
    view full answer...

  • Curt TriFlex Brake Controller Display Shows Only L.
  • The L. display should show up on the Curt TriFlex brake controller # C24VV, when it is plugged in. When you are installing the controller, the trailer should not be connected. The lever or button on the left side of the controller is the sensitivity adjustment. The L. should change when that lever is moved. You can also try resetting the controller by unplugging it for a few minutes and then plugging it back in (without the trailer connected). If these things do not fix the issue then
    view full answer...

  • How To Reset Curt TriFlex Trailer Brake Controller That is Hard Wired On a 2005 Chevy Silverado
  • If they did not use a Universal Wiring Adapter # C51515 and cut the ends off the Curt TriFlex Trailer Brake Controller # C24VV on your 2005 Chevrolet Silverado, you will need to do one of the following steps to cut power to your controller. The first is to follow the wiring and either disconnect any inline fuse or completely remove the black power wire where it receives power from on your Silverado. You can also remove the white ground wire as that will break the power connection to
    view full answer...

  • How to Install a Curt TriFlex Brake Controller on a Toyota 2013 RAV4 XLE
  • Your Curt Triflex brake controller part # C24VV can easily be wired to your 2013 Toyota RAV4 but it will require you to hardwire most of the connections. You will need to start with a 4-way (if you do not have one). For that you would want the # 118578. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and
    view full answer...

  • 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...

  • How To Install A Brake Controller On A 2015 Chevrolet Traverse
  • In order to install a brake controller like the Curt TriFlex Trailer Brake Controller part # C24VV on your 2015 Chevrolet Traverse, you first want to get a universal wiring harness like the Universal Wiring Adapter for Curt Trailer Brake Controllers part # C51515 and a set of wire connectors such as the Deka Heat Shrink Butt Connector part # DW05744-10. You can then begin the installation by attaching the wires from the brake controller to the pre-ran wiring harness on your vehicle.
    view full answer...

  • Trailer Brakes are Weak with Trailer Loaded Using Factory Brake Controller in a 2018 Ram 1500
  • When setting up the brake controller in your 2018 Ram 1500 you would want to do it with the trailer loaded. You can try setting it to the Heavy Electric Braking setting but I believe that only starts the brakes out more aggressively and will still only go up to the maximum you have it set for. What is likely happening is that the brakes on the trailer need to be adjusted out more. If you have a trailer wheel up off the ground and spin the wheel you should hear a slight but constant drag
    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...

  • Troubleshooting Curt TriFlex Trailer Brake Controller Showing Red Dot and Number without Trailer
  • If the red dot on your Curt TriFlex Trailer Brake Controller # C24VV remains on without a trailer connected, this can be an indication that the red wire from the controller is connected to the wrong side of the stoplight switch on your vehicle. I recommend verifying that the red wire is connected to the cold side of the stop light switch, which is the wire that ONLY receives power with the brake pedal depressed, and no power with any other function. You can use a circuit tester like #
    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...

  • 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...

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

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