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  1. Trailer Brake Controller
  2. CURT
  3. Electric
  4. Electric over Hydraulic
  5. Up to 4 Axles
  6. Proportional Controller
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
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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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CURT Trailer Brake Controller - C24VV

  • Electric
  • Electric over Hydraulic
  • Up to 4 Axles
  • Proportional Controller
  • CURT
  • Under-Dash Box
  • Dash Mount
  • Automatic Leveling
  • LCD Display
  • 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:  4.6 out of 5 stars   (51 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.


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)


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.


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


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


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.


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


Never a problem with etrailer


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.


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


Scratched screen straight out of the package/from the factory. Haven't installed yet. Super fast shipping!!


As advertised- very easy to install!


Was easy to install and works well.


Good ..except for shipping thru mail.


Couldn’t get any easier to install. Took less than ten minutes.


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


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


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


Perfect communication and quick deliver y!


Great fit works as described


install is a breeze!


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


She was great



Show More Reviews

See what our Experts say about this CURT Trailer Brake Controller

  • Is the Curt TriFlex Brake Controller Compatible with a 2014 Dodge Durango and 2010 Coachmen 290BHS
    Yes, the Curt TriFlex Brake Controller, # C24VV, and the Custom Wiring Adapter, # C51446, will work with your 2014 Dodge Durango and your 2010 Coachmen 290BHS travel trailer. Since your Durango has the factory tow package, the installation will be easy with the plug-in custom wiring adapter. The TriFlex brake controller was designed to work with trailers with up to 4 axles and 8 brake assemblies and it is compatible with electric and electric-over-hydraulic trailer brakes. The brakes on...
    view full answer...
  • Troubleshooting Curt Triflex # C24VV Issues After Unit Overheating
    First, check the display on your Curt Triflex # C24VV for any error codes that come up with applying the brakes with your trailer connected. If you get an error code, you can reference the user guide to find a potential solution. If you don't have any error codes showing on the display to help you diagnose the issue, I would start by checking the wiring on your vehicle and on your trailer, particularly the blue brake output wire. Check the wires for any signs of damage such as exposed wires...
    view full answer...
  • Brake Controller and Install Harness for a 2013 Ford Explorer
    For installing the Tri-Flex brake controller part # C24VV in a 2013 Ford Explorer the correct install harness is the part # C51322. I confirmed this with Curt as a fit for your vehicle. he Ford Explorer and Mercury Mountaineer have 6-pin connectors behind the glove box on the passenger's side that this connector will install into.
    view full answer...
  • Is the Tuson Sway Control Compatible with the Curt TriFlex Brake Controller
    Yes the Tuson Electronic Sway Control System for Electric Trailer Brakespart # 335TSC-1000 is perfectly compatible with the Curt TriFlex Trailer Brake Controller part # C24VV or any other brake controller. While the Tuson does use the trailers brakes this is only in a sway event any other time it is passive and will not effect the operation of the brakes at all.
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  • Compatibility of Curt True Course with Curt TriFlex Brake Controller
    The Curt True Course # C94VV is compatible with the Curt TriFlex brake controller # C24VV. The unit will start helping control sway and the brake controller will still function as intended to give your trailer the braking power it needs. The Curt will let the brake controller function the same way it would without it being connected, so you simply get the benefit of sway control using then together.
    view full answer...
  • Estimated Time to Install a Trailer Brake Controller on a 2014 Chrysler Town and Country
    There are a few things that are going to affect installation time of a brake controller on your 2014 Chrysler Town and Country. If the van already has a 4-Way connector, that will trim down the time a little. Depending on how you want to route the wiring will affect the overall installation time as well. I would say for a novice maybe 3 hours as an educated guesstimate. To install a brake controller on your van you will first need to have a 4-Way trailer connector, # C56331, if the van...
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  • Will The Curt TriFlex Trailer Brake Controller # C24VV Work as a Replacement For Old Tekonsha?
    Yes, the Curt TriFlex Trailer Brake Controller # C24VV can be used to replace the Tekonsha controller in your 2002 Dodge Ram 1 ton pickup. I do recommend wiring in the Pigtail # C51515 so you will be able to easily disconnect the controller in the future. This will help in the event you have a wiring issue down the road or wish to move the controller to a new truck.
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  • Troubleshooting Curt TriFlex Brake Controller Not Recognizing Trailer When Connected
    It sounds like there may be a damaged wire on your 2006 Dodge Ram 2500 Laramie. Since the Curt Triflex # C24VV only has the single red light we know the controller is getting power but with the 2nd red light not illuminating when connecting to the trailer the brake wire portion is not completing the circuit. You can use a Test Light # PTW2993 to check at the connector to verify if the damaged wiring is on the truck or trailer. Then you can move in either direction with the test light to...
    view full answer...
  • Towing Equipment Capacity for 2012 Toyota Highlander AWD
    According to the owner's manual, a 2012 Toyota Highlander equipped with AWD and the 3.5L engine has a maximum towing capacity of 5000 lbs for a braked trailer or 1000 lbs for an un-braked trailer. The maximum tongue weight of the trailer would be 11% of the towing capacity or 550 lbs. For a Class III hitch, I'd recommend the Curt # 13534. You'll also need a # 2753 ball mount and a trailer ball. For a 1-7/8 inch ball, use # 19260 or # 63845 for a 2 inch ball. For wiring, you'll need a...
    view full answer...
  • Manual Override on Brake Controller Not Working on 2012 Chevy Silverado
    There are some tests you can do on an aftermarket brake controller to determine if it is the problem. In the truck cab you will need to sever the blue wire several inches from the back of the controller. Then use a circuit tester such as # PTW2993 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override. If it shows power at idle, then there is something wrong with the controller and it will need to be replaced. If it does...
    view full answer...
  • Is the Curt Triflex Brake Controller Compatible with Electric Over Hydraulic Trailer Brakes
    Yes, the Curt Triflex Brake Controller part # C24VV that you referenced is compatible with electric over hydraulic brake actuators like the Titan BrakeRite # T4813102.
    view full answer...
  • Plug and Play Adapter for a Curt Brake Controller on a 2018 Toyota Tundra
    Yes, there is a plug in adapter to install the TriFlex NEXT # C24VV on your 2018 Toyota Tundra. You will need the plug-in adapter # C51455. The plug-in adapter connects behind the access panel to the right of the steering column. I have attached a picture below to help you find it.
    view full answer...
    Image 1 for
  • Why Does the Curt TriFlex Show Power Figures Without a Trailer Connected
    According to the owner's manual for the Curt TriFlex Trailer Brake Controller part # C24VV, the controller will display output settings without a trailer connected. I have attached for you below an excerpt from page 5 that explains this. "The maximum output setting is shown on the display when a trailer is connected and the brake pedal is pressed or the manual control is actuated. If a trailer is not connected the output setting is flashed when the brake pedal is pressed or the manual...
    view full answer...
  • Troubleshooting Curt TriFlex Brake Controller that Flashes 1.0 With No Trailer Connection
    This is a common issue when there is corrosion built up on the brake output pin of the 7-way. What this does is cause the controller to sense a slight amperage draw which confuses it into thinking a trailer is connected. The other thing you can try is unplugging the controller and plugging it back in. Sometimes the Curt controllers just need to have a hard reset to function normally.
    view full answer...
  • Troubleshooting Trailer Brakes That are not Functioning Properly
    This sounds like it could be one or two things. A short could definitely be causing the issue, but it may also be a ground problem as well. To start, reconnect the blue wire to the brake controller. This will take two people but using something like the Circuit Tester # PTW2993 you will need someone to run the manual override on the TriFlex # C24VV while checking the output on the 5 o'clock position on your 7 Way. This should be putting out 12 volts, or very close to it. When the manual...
    view full answer...
  • Parts Needed to Add 7-Way and Brake Controller to a 1998 Ford E-350 with Factory 4-Way
    To get a 7-Way and brake controller installed on your 1998 Ford E-350 you'll need a 7-Way connector and some additional 10 gauge wire so you can connect all of it to the pre-existing wiring at the back of your van. Here are the parts I recommend picking up to accomplish this: - Adapter 4-Pole to 7-Pole and 4-Pole # 37185 - 10 Gauge Wire # 10-1-1 - Curt TriFlex NEXT Trailer Brake Controller # C51140 - Curt Custom Wiring Adapter # C51322
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  • 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...
  • Troubleshooting D.C and C.C. Messages on Curt Triflex Trailer Brake Controller
    I recommend starting by checking both the tow vehicle side and trailer side connectors. Check to make sure that they are free of any debris or corrosion, cleaning out as needed. The D.C. message you are getting on the Curt Triflex # C24VV indicates no trailer brakes. This is typically caused by a loss of trailer connection, unplugged or bad wiring. If there is corrosion inside the vehicle or trailer connector, this will lead to a bad connection which might be what is causing these error...
    view full answer...
  • Curt Triflex Brake Controller Randomly Clicking
    Is the controller showing any error codes when the clicking is heard? The easiest place to begin would be to reboot the controller. Unplug the harness from the rear of the controller for a few minutes then plug the controller back in, which could possibly fix the problem. If that doesn't solve the problem, disconnect the red wire feeding the controller. If the problem still occurs the controller is faulty and should be replaced. If temporarily disconnecting the red wire corrects the...
    view full answer...
    Image 1 for
  • Economically Priced Proportional Brake Controller Recommendation for a 2004 Ford F-150
    For a great brake controller at a great price I would recommend the Curt Triflex Brake Controller part # C24VV. This is a proportional brake controller that will sense how much braking power the tow vehicle is applying and will proportionately apply the trailer brakes to slow the trailer down in a smooth, effective manner. To install the brake controller all you need is the correct install harness which would be the part # C51322. Check out the link to the install video I attached as well.
    view full answer...
  • Parts Needed to Install a Curt and Tekonsha Brake Controller in a 2014 Ram
    You do NOT have to install the Mopar brake controller in your 2014 Ram 1500, you can use an aftermarket controller like the Curt Triflex Brake Controller part # C24VV. All you would need for the installation would be the Curt Custom Wiring Adapter # C51453 that you also referenced. To see how this harness installs in your vehicle check out the installation instructions I attached. If your old controller was a Tekonsha brand the harness you would need instead is the Tekonsha Custom Wiring...
    view full answer...
  • Curt TriFlex Brake Controller # C24VV Installation in 2014 GMC Acadia
    To install the Curt TriFlex Brake Controller # C24VV in a 2014 GMC Acadia without factory trailer connector you will need the brake controller unit and wiring harness, parts # C24VV and # C51515, along with a brake controller install kit, part # ETBC7. Your vehicle needs to have a working 4-pole flat connector in order to install the # ETBC7. The 4-pole plugs into the supplied 7-way. If your Acadia has the tow package with factory 7-way you will not need the # ETBC7. GMC no longer provides...
    view full answer...
  • Is the Curt Triflex Brake Controller Compatible with Electric Over Hydraulic Brakes
    Sounds like you are trying to bleed your brake lines with a power bleeder. Is your power bleeder building pressure but nothings coming out of the fitting when you loosen it? If so, I would verify that your no lockout device is being activated. If you have a manual lock out be sure it's not activated and preventing the pressure from getting past the actuator. The Curt Tri-Flex part # C24VV that you referenced is compatible with electric over hydraulic brakes so it would work well with the...
    view full answer...
  • Custom Wiring Adapter For A Curt Brake Controller On A 2022 Chevrolet Express
    The Curt Custom Wiring Adapter for Trailer Brake Controllers # C51451 will plug into a Curt trailer brake controller like the Curt TriFlex Trailer Brake Controller # C24VV, and then will plug into your vehicles junction box located underneath the dash. However, # C51451 does not look like it'll work with your 2022 Chevrolet Express Van, so you'll want to use the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515.
    view full answer...

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Do you have a question about this Trailer Brake Controller?

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 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 Amanda K
Written by:
Amanda K

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