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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,C51392

Retail:$164.95
Our Price: $138.89
You Save: $26.06
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: C51392

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.



51392 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 - C51392

Average Customer Rating:  4.8 out of 5 stars   (88 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: Michael09/07/2020

The Curt Custom Wiring Adapter for the 2017 Honda Ridgeline worked perfectly for the installation of my new Curt Spectrum Trailer Brake Controller. Thanks etrailer!Thanks Curt!

Michael

9/8/2021

The Curt Spectrum Trailer Brake Controller has been working flawlessly. I am pleased that the custom harness made the install so simple.



by: Loren 05/14/2024

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



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: 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: Frank 04/20/2024

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



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: Chris 04/05/2024

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



by: Tim 10/13/2023

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



by: Richard 03/28/2024

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



by: Richard 03/28/2024

Have an installed it yet but it looks good thanks for the thanks for the fair shipping



by: Bill 03/13/2024

Perfect communication and quick deliver y!



by: John 03/13/2024

Great fit works as described



by: Ned b03/29/2014
Honda

Just finished the install. It was nice to be assured that I had everything I needed to finish the job before I got started. Honda didn't make it easy.



by: Hugh05/04/2020
2018 Ford Transit Connect

Installed the Curt Triflex in 2018 Honda Ridgeline RTL-E and was completely easy with the C51392 Honda specific wiring adapter that plugged into the Honda pre-wiring just above and left of the emergency foot brake as you look at the pedals. Like how the controller fits nicely in front of the shifter flat on the center console storage tray with a bit of Velcro to hold it and prevent movement in transit and matches the black interior trim well (didn't use the metal bracket that came with it). Have had great luck with Curt products (hitches, adapters, etc.) and this product is very well thought out. Too early to tell about long term use though.



by: John H.06/05/2019
2019 Honda Pilot

This part is listed to fit a 2019 Honda Pilot. I needed one for a 2019 Honda Passport;(basically the same vehicle); however since the Passports just came out in about February no one could tell me if it would work on the Passport. So I took a gamble and ordered this wire. Well I can confirm that this part does work on the 2019 Honda Passport. The hardest part was reaching the plug under the dash and getting this wire to plug into it, all without any room and only being able to get one hand up under dash. Wire made hooking up brake controller a lot easier than direct wiring.



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: Jonathon 10/19/2019
2019 Honda Pilot

This fit my 2019 Honda Pilot perfect. Plugged right in under the dash. The plug branches out of another wiring harness directly above your OBD plug in. On the left side of dash. You will have to lay down and get your head near the pedals to see it tucked up in there. Very easy install, glad I went with etrailer. Made it simple.


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


  • Curt TriFlex Trailer Brake Controller Only Shows L on Display
  • If your Curt TriFlex Trailer Brake Controller # C24VV is only showing "L." and you have tried adjusting the sensitivity to no avail then there is one other thing you can try. You can attempt to reset the controller by unplugging it from its power source for a number of minutes and then plug it back in though you need to make sure the trailer isn't plugged in when you are doing this. Should this not work then there was likely a short somewhere that damaged the controller's display and
    view full answer...

  • What Does 2 Dots on Curt TriFlex Brake Controller Mean
  • The two dots like . . on the Curt TriFlex, part # C24VV, just means that the controller is in standby mode with a trailer connector. If you have a trailer connected and aren't doing anything else with the controller this is normal.
    view full answer...

  • Can the Brightness On the Curt TriFlex Trailer Brake Controller Be Adjusted
  • The brightness on the Curt TriFlex Trailer Brake Controller part # C24VV is not adjustable. This is the case for most LED display brake controllers. The Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 has an LCD display which is adjustable.
    view full answer...

  • Constant Voltage on 12V and Brake Controller Output Wire with Curt TriFlex Trailer Brake Controller
  • When testing the wire functions after installing the Curt TriFlex Trailer Brake Controller # C24VV and Wiring Harness # C51515 in your 2014 Toyota Sienna, it is normal for both the 12V and brake lights on a tester to light up without actually activating the brakes. This is because the brake controller sends out a small trace current to look for a completed circuit. I have attached a demonstration video on a similar 7 Way Trailer Connector Vehicle Tester # C73NR that shows this right around
    view full answer...

  • Curt Tri-Flex Brake Controller that Stopped Working After Numerous Resets
  • Unfortunately the Curt Triflex # C24VV does not have the best reputation for being reliable. What you described sounds like it has an internal problem and would need to be replaced. If you wanted something that performed better and is much more reliable I would go with the P3 part # 90195 instead and you'll be much happier. No more constant resetting and overall better braking.
    view full answer...

  • Troubleshooting OL Code on Curt Triflex Brake Controller
  • The OL showing on your # C24VV Curt Triflex Brake Controller indicates that there is an overload error. If this problem is causing your brakes to fail I recommend not towing the trailer until you can fix the problem or find a replacement if necessary. To test the brake controller I would start by severing the blue output wire near the brake controller. Make sure you leave enough room to reconnect the wire and apply the slide-bar manual override. You will need a circuit tester like the
    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 Brake Controller OL Error Code
  • First easy thing to check is for corrosion on the brake controller output pin of your 7-way. Taking sandpaper to that will typically fix that. If you unplug the trailer from your tow vehicle, does the O.L code go away? If so that means the short is on the trailer side and you will need to check the wiring going from the 7-way connector to the braking assemblies for any damage and replace the damaged sections with # 10-1-1 and heat shrink butt connectors # DW05745-5. If the O.L code
    view full answer...

  • Parts Needed To Install a Curt TriFlex Trailer Brake Controller On a 2017 Nissan Frontier SV
  • To install the Curt TriFlex Trailer Brake Controller # C24VV that you saw on your 2017 Nissan Frontier SV you will need the Curt Custom Wiring Adapter # C51382. I have linked an installation video below that shows a Tekonsha Voyager # 39510 being installed with a Wiring Adapter # 3050-P on a 2016 Frontier that shows you the location of the factory connection. If this does not look like your wiring please send me the picture you have.
    view full answer...

  • Harness Needed to Install Trailer Brake Controller on 2007 Chevy Suburban
  • If your 2007 Chevy Suburban is equipped with the factory 7-Way connector at the rear then all the needed brake controller wiring is already ran under the dash but there isn't a plug there. This means to install the Curt TriFlex Trailer Brake Controller # C24VV you will just need the Wiring Adapter # C51515. One end of the harness will plug right into the TriFlex and the 4 bare wires at the other end will need to be spliced to the 4 wires under the dash of your Suburban using butt connectors
    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...

  • Troubleshooting "L Indicator Code On Curt TriFlex Trailer Brake Controller
  • Not to worry, this is a common issue and I will be happy to help you get it working again. The LED light that is showing an "L" on the Curt TriFlex Trailer Brake Controller # C24VV is an indication that the unit has received a power surge. My contact at Curt advised me that in most cases if you will go ahead and unplug the controller, let it sit for a couple of minutes and reinstall it, this process will clear this code out and go back to working as designed. If you still have problems
    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...

  • 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...

  • What Problems Does the Curt Triflex Brake Controller Have with 7-Ways With LED Test Lights
  • What happens is that the load that LED puts on the brake output circuit tricks the brake controller into thinking that there is a trailer connected and the brake controller will start activating regardless if there is a trailer connected or not. Technically it would work just fine with a trailer, its just that it will always activate regardless if there is a trailer back there or not. I attached installation instructions and an install video for you to check out also.
    view full answer...

  • Brake Controller, Weight Distribution and Transmission Cooler Recommendation for 2016 Toyota Tundra
  • We can help you with all things you mentioned! First, the Curt Triflex brake controller part # C24VV is a great option as our customers love it and because it works very well. To install it you would only need the install harness part # C51455. This will make installation very simple. For the weight of your trailer the best weight distribution with sway control will be the Equal-i-zer part # EQ37060ET which has a tongue weight range of 200-600 lbs and features the only sway control that
    view full answer...

  • Replacement Brake Controller Recommendation for Malfunctioning Curt Triflex
  • The Curt Triflex you have is known for internal problems like what you are experiencing. Honestly it's not a very reliable controller and it's time to replace it since it broken now. For a 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 setup. This is a proportional brake controller that senses the amount of braking the tow vehicle is applying and applies a proportionate
    view full answer...

  • Hitch, Wiring and Brake Controller Recommendation for a 2013 Dodge Durango
  • Lets start with the hitch, for that our most popular hitch with other owners of Durangos is the Curt Hitch part # C13182. This is a Class III hitch with a 2 inch opening with plenty of capacity. I attached an install video for you to check out. Next we need wiring. You will need to start with a 4-way. For that I recommend the Curt Upgraded Trailer Wiring Harness part # C65133. Now you will need to convert the 4-way to a 7-way so that you can install a brake controller. For that you
    view full answer...

  • Troubleshooting Curt Brake Controller that Rests When Brakes are Released
  • So the controller resets every time you apply and release the brakes? You might check to make sure you made all the connections correctly when you wired it to the correct functions. Most likely it sounds like there's an issue with the red and black wires of the controller. The black wire of the controller needs to run to a power source that is hot all the time and the red wire needs to run to the stoplight circuit. Now all of that said the TriFlex is known to be prone to internal problems
    view full answer...

  • Installing A Curt Spectrum Trail Brake Controller In A 2020 Honda Passport
  • Hi Louis, Are you not able to find the factory connector to plug in the Curt Custom Wiring Adapter # C51392? If so I've attached a video of another brake controller wire harness that plugs into the same connector on a 2019 Passport to help you find the connector. You can skip past the intro to minute mark 4:49 to see where the connector sits. If you're having a different issue then let me know and I'd be happy to help so you can get your Curt Spectrum Trailer Brake Controller # C51170
    view full answer...

  • Install Harness for Curt Assure Brake Controller for 2021 Honda Ridgeline
  • To install the Curt Assure brake controller part # C49UR in your 2021 Honda Ridgeline the correct install harness is the part # C51392. The other harness was designed for other vehicles and not yours.
    view full answer...

  • Correct Curt Brake Controller Adapter Harness for 2023 Honda Pilot
  • Correct, the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51392 is a fit for all models of a 2023 Honda Pilot. It will allow you to use a trailer brake controller like the Curt Assure Trailer Brake Controller part # C49UR which is what I recommend. This is an excellent setup that allows for towing a trailer with brakes without any splicing required. The proportional design of the controller will provide a smooth braking feel and the adjustable display will ensure you
    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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