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  1. Trailer Brake Controller
  2. CURT
  3. Electric
  4. Electric over Hydraulic
  5. Proportional Controller
  6. Up to 4 Axles
Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional
CURT

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

Part Number: C24VV
In Stock
$124.95
Retail:$164.95
You Save: $40.00
Trailer Brake Controller
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This compact brake controller fits nicely in your cab. It's designed to mount flush to the dash and is only 1" thick. The controls are simple, the LED display is large and bright, and the manual override is easy to reach in a pinch. Great Prices for the best trailer brake controller from CURT. Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional part number C24VV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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CURT Trailer Brake Controller - C24VV

  • Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • Under-Dash
  • Under-Dash Box
  • Plug-In
  • LCD Display
  • Single Trailer Only

This compact brake controller fits nicely in your cab. It's designed to mount flush to the dash and is only 1" thick. The controls are simple, the LED display is large and bright, and the manual override is easy to reach in a pinch.


Features:

  • Activates trailer brakes in proportion to your vehicle's braking
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
    • Automatically increases power when going downhill and decreases when going uphill
  • Shows you braking and sensitivity settings and error codes on a simple LED display
  • Uses rocker switches to set settings
  • Activates manual override with pinch-trigger
  • Protects your vehicle, trailer, and controller
    • Runs continuous diagnostic checks
    • Minimizes drain on car battery with sleep mode
    • Keeps trailer brakes from overheating by reducing power output during prolonged stops
    • Defends brake controller and trailer breakaway systems against shorts
    • Prevents positive and negative power reversal with built-in polarity protection
  • Mounts at any angle
    • Automatic leveling
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) available for certain vehicles


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
    • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Dimensions: 4" long x 3-1/8" wide x 1" tall
  • Limited lifetime warranty


Gain and Load Adjustment

Curt TriFlex NEXT

Gain is the maximum amount of power that will be applied to your trailer's brakes. 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. Use the gray rocker switch to adjust the gain on a scale of 0.5 to 9.9 in increments of 0.5.


Once you have the gain set, you can fine-tune your braking by adjusting the load control on a scale of 1 to 9 using the black rocker switch. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. If your vehicle takes too long to come to a stop, increase the setting. If it stops too abruptly, decrease the setting.


LED Display

The LED display on the TriFlex is large and easy to read at a glance. You can adjust the brightness or trigger night mode so it won't glare obnoxiously on your dash. It also will give you error messages you can use to troubleshoot.


Curt Discovery NEXT troubleshoot

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.


Installation

Automatic leveling means 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


If you don't already have a 7-way plug at the back of your vehicle, take a look at our exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately).


What is Proportional Braking?

What is proportional Braking

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

Installation Details C24VV Installation instructions


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.6

792 reviews
This compact brake controller fits nicely in your cab. It's designed to mount flush to the dash and is only 1" thick. The controls are simple, the LED display is large and bright, and the manual override is easy to reach in a pinch.

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Show More Reviews

See what our Experts say about this CURT Trailer Brake Controller

  • How Does Curt TriFlex NEXT Brake Controller Mount
    You're right, the mounting bracket is unique (in a good way) for the Curt TriFlex NEXT Trailer Brake Controller # C24VV. The bracket is smaller and all you do is put the included adhesive tape on the bracket and stick it wherever you like under your dash. Screws are also included and you can use them with the adhesive to mount the bracket under your dash. Then you'll simply slide in the TriFlex NEXT controller and that's it. This type of bracket takes up less space than the normal U-shaped...
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  • Hitch, Weight Distribution and Brake Controller Recommendations for a 2017 Toyota Sienna XLE
    We can get you everything you need for towing with your 2017 Toyota Sienna XLE. By plastic shield, I believe you are referring to the appearance panel underneath the Sienna, and that will have to trimmed a bit in each of the hitches available for the vehicle. A great Class III hitch would be the Curt # C13105, which is rated for weight distribution and has been given a nearly 5-star review on our site by the over 500 customers that have rated it. As for a brake controller, the wireless...
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  • Troubleshooting Curt Triflex Brake Controller Showing OL Code on Display
    The Curt Triflex brake controller is known to have more problems than other brake controllers so I would not rule out the problem being the controller. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # PTW2993, you should get output to the controller side of the wire you severed. If the manual slide activates...
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  • How to Reset Curt Triflex Brake Controller
    Try unplugging the brake controller for 10 seconds or so and then replugging it in. Sometimes brake controllers like the part # C24VV just need to be reset and this is the corret way to do that.
    view full answer...
  • LED Display of Curt TriFlex # C24VV Brake Controller Remains Illuminated When Vehicle is Shut Off
    Because it's connected to a constant 12-volt power source, the LED you mention will remain illuminated after the vehicle is shut off. This is normal, and does not indicate a problem of any kind. After 15 or so minutes of inactivity, the brake controller goes into a 'sleep' mode, and will reactivate next time the brake pedal is pressed. The LED only draws a few milliamps of power, which would only drain the battery if the vehicle sat unused for months. You could certainly unplug the controller...
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  • Troubleshooting Brake Controller with OL Code when Brakes are Applied
    If you check out the attached instructions for the Curt TriFlex Trailer Brake Controller # C24VV you can see that the OL code you are getting means that there is an "Overloaded output circuit, trailer brake system fault". Whichever controller you have the problem and solution is the same. You have a short on your brake signal circuit from your brake controller to your trailer brakes which is causing too much power draw. Check both the tow vehicle and trailer connectors and make sure...
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  • Will Curt TriFlex NEXT Controller and Wiring Adapter Fit a 2022 Genesis GV70?
    Hey Anthony, thanks for reaching out! The Curt TriFlex NEXT Trailer Brake Controller #C24VV and Curt Adapter # C77BR will fit your 2022 Genesis GV70 just fine. The only way a Tekonsha adapter will work is if you cut off the connector for the controller side and splice it into the wiring for the brake controller. So, while the adapter might cost a little less, it kind of defeats the purpose of the plug-in adapter anyways so it would be better just to use the Curt adapter. Do you already...
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  • Recommended Weight Distribution System for a Keystone Springdale Mini RV
    Hey Jacobus glad you asked your question and congrats on the new RV! You are going to be way overrated if you use a 1,500 lbs or 1,000 lbs tongue weight rated weight distribution system. Bigger in this situation is definitely not going to be better. If you run that high of a capacity system you'll have an extremely ridged and uncomfortable ride. Plus there's potential to damage your trailer's frame. For your Keystone Springdale Mini RV, I recommend the Equal-i-zer Weight Distribution...
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  • 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...
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    To install the Tekonsha Prodigy P3 # 90195 you were looking at in your 2006 Ford F-450 Cab and Chassis you will need the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers # 3065-P which will plug into the factory trailer brake controller port underneath the dash of your truck, and will not require any splicing to install. Once the adapter is plugged in, all you will need to do is mount the controller and you are ready to get on the road! I included videos for both of the...
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  • Troubleshooting Curt TriFlex Brake Controller Not Showing Activation
    On your Curt TriFlex Trailer Brake Controller # C24VV, the decimal point as you put it is standby mode with no trailer connected. The blank screen is also standby mode and that screen is what is seen when simply starting the vehicle, but that screen should illuminate when you press the manual override or show the decimal point when you hit the brake pedal only while moving since it is a proportional controller. If it does not operate under those criteria, then you will need to have the...
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  • Troubleshooting Curt Triflex Brake Controller that Stopped Working with Brakes
    First thing to check is to see if your truck's third brake light is still working when you hit the brakes. When the fuse for that circuit goes on GM trucks like your 2014 model it will prevent the brake controller from activating when the brakes are applied. Next check to see if there's voltage on the red wire of the brake controller when the brakes are applied. If so, and the controller still won't activate with the pedal it has an internal problem and would need to be replaced. Curt...
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  • Where Does the Red Wire for a Brake Controller Attach to a Vehicle
    The red wire on a brake controller signals the controller that you are stepping on the brake pedal, so it has to be connected. It does not operate the brake lights on the trailer. It attaches to the cold side of the brake switch. The brake switch is located above the brake pedal. If I knew the year, make, and model of the vehicle I might be able to tell you which wire it is. To find it you will need a circuit tester like # PTW2993 if you do not already have one. Use the circuit tester...
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  • Troubleshooting Curt Triflex Brake Controller that Flashes that a Trailer is Connected
    The Triflex # C24VV sometimes does need to be reset occasionally. Try unplugging it and plugging it back in after a few seconds and it should work again. Otherwise you have a short between the black wire and the red wire and your controller therefore is thinking you have the brakes all the time. If you can check the connections between the two circuits there might be exposed wire between the two and that's why you are seeing the issue. I also attached a help article on troubleshooting...
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  • 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.
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  • Troubleshooting Curt TriFlex Brake Controller that Flashes L.6
    L.6 is the sensitivity setting your Curt Triflex # C24VV currently has. It has a sensitivity range between L.1 through L.9. Since Curt controllers are known to be a bit buggy this isn't super surprising that you are seeing this. What Curt would recommend is to unplug the controller for a few seconds to let it reset and then plug it back in. Normally this takes care of strange behavior like this.
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  • 7-Way Installation Kit to Install Curt TriFlex Brake Controller in 2017 Audi Q5
    So far so good but you need one more thing in order to install the Curt TriFlex Trailer Brake Controller # C24VV with Adapter # C51515 in your 2017 Audi Q5. Now that you have the 4-way # 119250KIT installed you will need to add the Universal Installation Kit for Trailer Brake Controller # ETBC7. This is going to give you the 7-way connector, circuit breakers and rest of the hardware needed to complete your brake controller installation. I have added links to a pair of help articles for...
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  • How Much Can a 2004 Chevrolet Trailblazer with V6 Tow
    The towing capacity of your 2004 Chevrolet Trailblazer can vary from 4,800 lbs to 6,200 lbs depending on drive type and axle ratio. If you can provide these then I can give you an exact towing capacity or you can refer to page 4-55 of your owner's manual. The weight of the car and trailer cannot exceed that of your vehicle's towing capacity. If you are able to tow your car and trailer with the Trailblazer then you will need a trailer wiring harness and brake controller if the trailer...
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  • Does Curt TriFlex NEXT Brake Controller Have to be Calibrated When Vehicle Is Turned Off
    Nope, the Curt TriFlex NEXT # C24VV will not have to set up and be recalibrated when the vehicle is turned off, it will keep the settings you use.
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  • 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.
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  • How Can I Be Sure My Curt Triflex Brake Controller Is Working Worrectly
    Hello Dan, I can definitely help with this. It is completely normal for the Curt TriFlex brake Controller # C24VV to show the current gain setting when the brakes are applied, or when the manual override is pressed. It sounds like you have the gain currently set at 9.7 which is why you are seeing this number flash on the display. So, it sounds like it is working correctly and there is no problem with the controller. I suggest trying to turn the gain down. This way you can be 100% sure...
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  • Brake Controller Installation on my 2017 Audi Q7
    With the Curt Triflex part # C24VV and the Curt Adapter part # C51522 you will have all you need to successfully install your controller. I have linked a video for you showing the operation of the controller. Check it out to familiarize yourself with it.
    view full answer...
  • Troubleshooting Curt Triflex Brake Controller that Locks Brakes Up On Lightest Setting
    It sounds like your brake output circuit may be shorting out to the stoplight circuit of your trailer wiring and that is why the brakes want to lock up immediately. An easy way to test this is to check to see if the brakes end up pulsating when you have either blinker on. If so, then what I described is happening. Otherwise, did the brake controller's position change? Since it is a proportional controller it has to sit level horizontally and vertically to allow the controller to function...
    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...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Ethan H
Video by:
Ethan H
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Installed by:
Michael B
Employee Ryan G
Test Fit:
Ryan G
Employee Trevor W
Test Fit:
Trevor W
Employee Amanda K
Written by:
Amanda K

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