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

Item # C24VV
Our Price: $124.95
You Save: $40.00
Trailer Brake Controller
Shipping Weight: 0.66 lbs
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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. 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 or call 1-800-940-8924 for expert service.
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  • Reviews (15)
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CURT Trailer Brake Controller - C24VV

  • Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • LCD Display
  • Dash Mount
  • Under-Dash Box
  • Automatic Leveling
  • Up to 360 Degrees

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.


  • 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


  • 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'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

Installation Details C24VV Installation instructions

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (15 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.


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.


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


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


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


install is a breeze!


She was great












See what our Experts say about this CURT Trailer Brake Controller

  • Curt Triflex Brake Controller Troubleshooting Flashing 9.9 All the Time
    The flashing output of a Curt Triflex normally indicates that the brake pedal is pressed but a trailer isn't connected. Since yours is flasing all the time that would indicate that you most likely have a short between the 12 volt power wire for the brake controller and the stoplight switch circuit which is confusing the controller into thinking that the brakes are applied all the time. The solution will be to go over the wiring of the brake controller to find the short and fix as needed.
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  • 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...
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  • Curt TriFlex # C24VV Keeps Turning Off and On
    It sounds like there is either a wiring issue or your Curt TriFlex # C24VV has seen better days. Check the grounds for your brake controller as well as the other wires to make sure everything is clean and ready to go. If your TriFlex is randomly losing power then I would spend special close attention to the Black wire from the controller and where it leads out to the battery. Let me know if you are still having an issue and I can help you troubleshoot further.
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  • Should Curt TriFlex Brake Controller Show a Red Light when the Brake Pedal is Pressed?
    Curt brake controllers like the TriFlex # C24VV should show a red light when the brake pedal is pressed, even when the trailer is not connected. This is just the way that Curt designed them to show they are still receiving the signal even though they are not sending it to a trailer.
    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.
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  • Troubleshooting Curt Tri-Flex Trailer Brake Controller C24VV Failures
    Some trailer brake controllers can be damaged by incorrect polarity of the incoming power, but the Curt Tri-Flex # C24VV like many better such units has built-in polarity protection. But if you have had two brake controllers suffer the same fate, a quick death, after being connected to the same vehicle and trailer for only 250-miles of towing then your issue is most likely to be a short in your trailer socket on the vehicle or on the trailer. Start your check at the 7-way vehicle socket....
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  • How to Rese Curt Triflex Brake Controller C24VV
    To reset your Curt Triflex part # C24VV all you need to do is unplug it temporarily and then plug it back in. Once you do that the controller will have reset itself.
    view full answer...
  • Troubleshooting Trailer Brakes that are Weak
    Your Triflex controller is a proportional controller which means that with the brake pedal it's only going to apply braking power if it senses deceleration. If you are sitting still when you performed this test (most likely) then the controller won't send a lot of amperage/voltage to the trailer brakes. Most of the time when what you described occurs it's that the brakes need to be adjusted. I have included a link to a video to the right that should help. Fast forward to about the 4 minute...
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  • Meaning of Error Code RC with Curt Tri-Flex Trailer Brake Controller C24VV
    I could not find purchase history for a brake controller based on your email address but I do note that you referenced a question regarding the Curt Tri-Flex # C24VV. With this brake controller the code RC indicates that the unit needs to be recalibrated. You can accomplish this by unplugging the trailer connector from the tow vehicle, waiting a minute or two and then re-connecting it. I linked the installation instructions and troubleshooting guide for this item for your reference.
    view full answer...
  • Does Having Curt Triflex Brake Controller On all The Time Affect Lifespan of Controller
    Brake controllers are designed to be on all the time and leaving yours on would not be an issue at all. The reason you don't want to cut power to the controller is that you'd lose all your settings if you did so.
    view full answer...
  • Troubleshooting Curt TriFlex that is no Longer Detecting Trailer
    Since the Curt TriFlex # C24VV isn't detecting the trailer I would start by checking the 7-way at the rear of your 2007 Toyota Highlander. Make sure it's clean and free of any corrosion. Then test the brake circuit pin in the 5 O'clock position when the manual override lever is triggered using a circuit tester like # 3808. If you're not getting any power at the 7-way then you'll need to test closer to the controller. Cut the blue wire about 10 inches or so from the controller and test...
    view full answer...
  • Connection Shortage On Brake Controller Wiring
    The issue is most likely on the trailer instead of a brake controller like # C24VV for example. I know you said you adjusted the brakes but I recommend adjusting the brakes more. Take a look at our video on how we adjust trailer brake assemblies, fast-forward to the 4:35 mark of the video. Have you tested the brake magnets already? I have an article attached that goes into detail on how to test the brake magnets if you have not done so already. The wire running inside the axle is the...
    view full answer...
  • Should Curt TriFlex Brake Controller Cause Shaking During Stopping
    A brake controller should have no affect on the way the truck brakes when a trailer isn't connected. I'd recommend disconnecting it though right now to see if somehow the wiring is causing an issue. If it is the wiring it'll be the red wire of the controller being connected to the wrong circuit. It needs to be on a circuit that only sees voltage when the brakes are applied. It almost sounds like you have warped brake rotors though as that's typically what causes a vehicle to shake or wobble...
    view full answer...
  • What is the Operation of the Digital Display on the Curt TriFlex Brake Controller
    The digital display on the Curt TriFlex Brake Controller, # C24VV, is used to communicate operational information as well as error codes that might interrupt the operation of the system. The display can communicate power and sensitivity settings to the driver. The readings will tell the driver what the controller settings are when operating. This information will allow the driver to decide if the settings are fine for their towing application or if they need to be adjusted to accommodate...
    view full answer...
  • 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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  • What Does 1.1 On Display of Curt Triflex Brake Controller Indicate
    That means that your Curt Triflex brake controller part # C24VV is putting out "1.1" braking power to your trailer brakes. That's the initial braking power that applies and then from there it will apply more braking power based on how hard you apply the vehicle brakes as this controller is proportional and is designed to sense the amount of braking that your tow vehicle applies.
    view full answer...
  • What Does Code L. Mean on Curt Triflex Brake Controller
    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...
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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...
  • Curt TriFlex Trailer Brake Controller A.E. Error Code Troubleshooting
    The operating instructions for the Curt Triflex brake controller # C24VV, which are linked for you, indicate on page 19 that if the unit displays the error code A.E. this indicates an internal fault with the controller's accelerometer. This is not a serviceable problem and the unit should be replaced or referred to Curt for warranty service under the terms of the limited lifetime warranty.
    view full answer...
  • What Is The Difference Between Proportional and Time Delayed Trailer Brake Controllers?
    The Curt TriFlex NEXT Trailer Brake Controller # C24VV you are looking at is a proportional controller. This means when you press on the brakes the controller is going to have an inertia sensor which then factors in how quickly the vehicle is stopping and adjusts the amount of power going to the trailer brakes from your original setting. The easiest explanation I can give you is when you lightly press the brakes to slow down this controller will lessen the amount of power sent to the trailer...
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  • Could Curt Triflex Replace Curt Venturer In 2015 Jeep Wrangler Unlimited
    Yes a proportional Curt controller like the part # C24VV could easily replace a # C74VV. It would be just a matter of unplugging the old controller and plugging in the new one. For suspension enhancement I would go with the Timbren kit part # TJRJK instead of an air bag kit because maintaining air pressure in bags can be a bit of a hassle and the Timbrens get installed and you never have to think about them again.
    view full answer...
  • Malfunction of Curt Venturer Brake Controller # C74VV Used with Electric-Over-Hydraulic Brakes
    The Curt Venturer Brake Controller # C74VV that you are using is designed for use only with electric trailer brakes. Since you mention a solenoid it sounds like your trailer may be equipped with an electric-over-hydraulic brake actuator. Such a system will not work with the Curt Venturer. If this is the case you will need to choose another brake controller that has a switchable setting to allow it to be used with EOH brake actuators. Curt offers their Tri-Flex # C24VV that is compatible...
    view full answer...
  • Difference Between Curt TriFlex and Curt TriFlex NEXT Brake Controllers
    Great question Max! Yes, the Curt TriFlex NEXT Trailer Brake Controller # C24VV is just an upgraded version of the Curt TriFlex # C51140 with the upgrades being a refreshed computer system and the ability to be mounting in any orientation instead of being limited to a 90-degree vertical and 40-degree horizontal like what we see with the older model. Because of this I highly recommend going with the NEXT version over the original version.
    view full answer...
  • Brake Controller Displays L Error Code After Vehicles Alternator Is Replaced
    My initial suspicion is that when the vehicle's electrical system powered back up after the alternator was replaced, a voltage spike hit the brake controller, causing the display you mentioned. My contact in the Tech Services department at Curt has confirmed this. According to Curt, if you unplug the controller for a few minutes then plug it back it, in most cases the brake controller will once again function normally. In rare instances, this can cause a internal short circuit in the controller,...
    view full answer...

Do you have a question about this Trailer Brake Controller?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Installed by:
Michael B
Employee Amanda K
Written by:
Amanda K

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