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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,C51451

Retail:$191.29
Our Price: $138.39
You Save: $52.90
Trailer Brake Controller
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Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional
part number: C24VV

Simple and compact, this proportional brake controller has an intuitive design that's easy to use. Includes a simple digital display, 10 gain settings, a pinch-trigger manual override, and built-in safety features.

Features:

  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
  • Simple digital display shows you the braking and sensitivity settings as well as error codes
  • Intuitive controls keep settings within easy reach
    • 10 Levels of boost let you adjust initial braking power and aggressiveness for smooth, safe braking
    • Pinch-trigger manual override allows you to control trailer sway or stop in emergencies
  • Triple-axis, motion-sensing accelerometer provides highly responsive, smooth stops
    • Automatically increases power when going downhill and decreases when going uphill
  • Integrated safeguards protect your vehicle, the trailer, and the controller
    • Runs continuous diagnostic checks to alert you to any potential problems
    • Minimizes drain on car battery by entering sleep mode after 5 minutes of inactivity
    • Keeps trailer brakes from overheating by reducing power output to them during prolonged stops
    • Defends brake controller and trailer breakaway systems against shorts
    • Prevents positive and negative power reversal with built-in polarity protection
  • LED display shows power adjustments in 0.5 increments
    • Brightness is adjustable for optimal visibility
  • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Automatic leveling lets you mount at any angle
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used to reduce installation time on certain vehicles


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
  • Dimensions: 4" long x 3-1/8" wide x 1" tall
  • Limited lifetime warranty


LED Display

The LED display on the TriFlex is large and easy to read at a glance. It will show you what setting the brake controller is on as well as give you information for troubleshooting. You can adjust the screen brightness or trigger night mode so it won't glare obnoxiously on your dash.


To change any of the settings, press the silver mode button on the front of the brake controller and which mode you are currently on will show on the LED display. When you're on the setting you want to adjust, use the black rocker switch next to the mode button to adjust it up or down.


Gain Adjustment

Gain control lets you set the maximum amount of power that will be applied to your trailer's brakes, adjusting in increments of 0.5. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to go as high as you can without the trailer brakes locking up. Typically, the gain is only readjusted when you experience changing road conditions or if the weight of your trailer changes. To get more power to your brakes, press the upper rocker switch. To decrease the gain, press the lower switch. When you make your adjustment, the gain setting will show on the LED screen for 10 seconds and then go into sleep mode.


Load Control

Once you have the gain set, you can fine-tune your braking by adjusting the load control on a scale of 1 to 9. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. Load control can get the braking power to your trailer faster and with more intensity so that it doesn't push your tow vehicle forward. If your vehicle takes too long to come to a stop, increase the setting by pressing the upper rocker switch. If it stops too abruptly, decrease the setting by pressing the lower switch. You can alter the setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads.


Pinch-Trigger Manual Override

The TriFlex comes with a easy-to-reach, pinch-trigger manual override, great for stopping sway or controlling your trailer's momentum in emergencies. To engage the manual override, just push in the trigger. This will activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.


Safety Features

The TriFlex offers key safety features to prevent damage to various components of your towing setup. This starts with built-in protection against shorts and positive and negative power reversal, as well as continous diagnostic checks to alert you to any potential problems as they come up. To minimize the drain on your vehicle's battery, the TriFlex will automatically go into sleep mode after 5 minutes of inactivity. Sleep mode will turn off again the moment you press the brake pedal.


Curt TriFlex NEXT

Quick Installation

Automatic leveling means you can mount the unit at any angle. Your mounting options are limitless, so long as you can still easily access the controller and the manual override. The included bracket is designed to mount the brake controller flush to the dash so it takes up almost no space at all.


If your vehicle already has a plug-in brake controller wiring harness, just connect the unit to it. Otherwise, you will need to purchase a vehicle-specific wiring harness (sold separately) to plug into. If a harness is unavailable for your vehicle, hardwiring will be necessary.


Note: If a custom brake control wiring adapter is not available for your vehicle, one of the following will be required:

20-Amp circuit breaker (9506P - sold separately) for 2- to 4-brake applications

30-Amp circuit breaker (38630 - sold separately) for 6- to 8-brake applications


See also etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.


Proportional Braking

What is proportional Braking

The Curt TriFlex NEXT brake controller comes equipped with proportional braking to give you the best towing experience. Proportional braking means that your trailer brakes mimic your tow vehicle's brakes. If you slam on the brakes in your vehicle, your trailer brakes will activate with the same intensity; if you brake lightly, your trailer brakes lightly too. The trailer's braking is in proportion to your vehicle's braking. This saves wear and tear on the tires and the brakes on both your vehicle and trailer.


The TriFlex uses an internal 3-axis accelerometer to sense how your vehicle is braking so it can send the right amount of braking power to your trailer. It measures the inertia of your tow vehicle and activates the trailer's brakes to slow at the same rate. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.



51146 Curt Tri-Flex NEXT Proportional Trailer Brake Control

Replaces Curt 51140



Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In
part number: C51451

Install your Curt electric trailer brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your 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 port is located in the wiring panel underneath the dash, to the left of the steering column, 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.



51451 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 - C51451

Average Customer Rating:  4.7 out of 5 stars   (199 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 controller and then plug the other end into the built-in port beneath your vehicle's dash.

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: R G02/17/2024

Thanks to etrailer foor the quick tutorial on where to plug it in at!



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: David 05/05/2024

Fit perfect



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: Stephen 02/08/2024
2018 Chevrolet Silverado 1500

Perfect fit just plugs in…nothing to it!



by: Bill 03/13/2024

Perfect communication and quick deliver y!



by: John 03/13/2024

Great fit works as described



by: Bob B09/02/2014

Works great. Easy to follow online installation instructions for the wiring adapter - no problem!

Bob B.

9/2/2015

It works just fine, no problem at all.



by: Scott09/18/2022

I’m not sure if this part is good or not because it is part of a trailer brake choice that doesn’t work well. It is possible that this is the problem, but no one seems to be able to tell me what the problem is.



by: Domenico11/29/2023

install is a breeze!



by: Greg C.08/04/2015
2015 Chevrolet Silverado

After talking at length (at least 15 minutes) to the rep on the phone, I choose the Curt TriFlex controller for my 2015 Silverado. It happens to be the same unit sold on Chevy's website (but cheaper on etrailor). The sales person was awesome! She wanted to be sure I got the right one, not trying to upsell me on something I didn't need. Just as she promised, it plugged right in under the dash and I even used an existing screw to mount the bracket. A 15minute install!!! I will shop here again.



by: Wes05/21/2021

This thing does everything you could ask a trailer brake controller to do. Easy to install, easy to adjust, and performs flawlessly. And it is priced right where it should be.


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


  • Finding The Correct Brake Switch Wire For Adding Brake Controller on 1990 GMC 1500 Pickup
  • The 1994 Chevrolet 1500 pickup is the closest vehicle we have installed a brake controller on in our shop to your 1990 GMC 1500. When we installed the Curt Triflex # C24VV with the Adapter # C51515 and Install Kit # ETBC7 as seen in the video linked below we found the yellow wire form the brake switch as the wire for connecting to the red wire on the brake controller. While I can't say for sure this is going to be the exact same on your GMC it should help you confirm the correct wire with
    view full answer...

  • 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...

  • Recommended EOH Trailer Brake Controller for a 2001 Dodge Ram
  • The Curt TriFlex Trailer Brake Controller part # C24VV is an excellent option for a 2001 Dodge Ram and will work with trailers that have electric over hydraulic brakes. It also offers plug-in-play installation when used with the Curt Custom Wiring Adapter part # C51332. This will be a great option that will serve you well
    view full answer...

  • Troubleshooting Curt TriFlex C24VV Saying D.C and Locking Up Trailer Brakes When Brakes Are Applied
  • I would be happy to help! Since your Curt TriFlex Trailer Brake Controller # C24VV is saying D.C. and locking up the trailer brakes there is a short in a wire or the controller, or there is an issue in the physical connectors. I recommend starting with the easiest things first which is checking both the trailer and vehicle connectors for corrosion or damage that could be causing the connection issue. Next using a circuit tester like # PTW2993 test the 5 o'clock brake output pin
    view full answer...

  • Install Harness for Curt Triflex for 2019 Honda Pilot with Factory 7-Way
  • Since you are having a factory 7-way installed on your 2019 Honda Pilot all you need to install the Curt TriFlex part # C24VV is the install harness part # C51392 since you'll have all of the factory wiring needed to install.
    view full answer...

  • Troubleshooting OL Error on Newly Installed Curt TriFlex
  • The "O.L." code on your Curt TriFlex # C24VV corresponds to some short of sort on the system. It would seem like what you're experiencing is likely down to one of two things; 1) there's an issue with the ground wires somewhere in what's been installed; I recommend checking the ground on the trailer wiring and vehicle wiring harnesses and making sure they're connected to rust and debris free spots on the trailer and vehicle. 2) there is an issue on the brake output wire-possibly a
    view full answer...

  • Parts Needed to Tow a Trailer with a 2004 Lexus GX 470 with Tow Package
  • In regards to a 2004 Lexus GX 470, the factory tow package comes with most of the needed components. The only things you'll need to add to add really is a brake controller (if trailer has brakes), ball mount/hitch ball, and transmission cooler (recommended for high elevation towing). I recommend the Curt TriFlex Trailer Brake Controller part # C24VV with Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51362 and then the etrailer Ball Mount Kit part # 989899. If you decide
    view full answer...

  • What Does an OL Error on the Curt Triflex Brake Controller Mean?
  • The "OL" error code on the Curt Triflex # C24VV means there is a short in the blue wire output circuit or trailer plug. Basically all you need to do is find the short and repair it. With the noise you are getting at the hitch, I can almost guarantee the short is at or near the 7 Way plug near your hitch.
    view full answer...

  • Troubleshooting Curt TriFlex Brake Controller Flashing After Ignition Is Turned Off
  • It is not normal from what I can read in the instructions for your Curt TriFlex Trailer Brake Controller # C24VV to flash just because your 2019 GMC Sierra 1500 ignition is switched off. To determine if you have a defective controller you will want to take a Test Light # PTW2993 to the red wire of your brake controller to determine if the brake switch on your Sierra is activating. This would cause your controller to flash if the brake switch or wiring to it is faulty. I do see that
    view full answer...

  • How Many Wires Under Hood Need Attached On 2008 Chevy Silverado for Brake Controller
  • The Curt TriFlex Trailer Brake Controller part # C24VV is an excellent option for a 2008 Chevrolet Silverado when used with the Universal Wiring Adapter for Curt Trailer Brake Controllers part # C51515. The wires under the dash are already ran and labeled for you. Once the wires under the dash are hooked up, all you will need to do is make one connection under the hood in the engine bay. This connection is a red wire to the right of the fuse box which needs to be attached to the M6 stud
    view full answer...

  • Could Curt Triflex NEXT Brake Controller Drain Truck Battery
  • Nope, definitely not; brake controllers, including the Curt TriFlex NEXT # C24VV will go into sleep mode after a period of time. While technically it still draws power, it is such a low amount that your battery would die from inactivity before it would drain it.
    view full answer...

  • Troubleshooting the Curt TriFlex Trailer Brake Controller on a 2010 Chevy Silverado 1500
  • My first step to helping you determine why the Curt TriFlex Trailer Brake Controller part # C24VV is not working would be to make sure you are checking the correct fuse that corresponds to the brake controller and its power supply. On your 2010 Chevy Silverado 1500 this fuse will be located in the engine bay fuse box labeled as the #1 fuse. You can see this location in the attached photo. Once you have confirmed that the trailer brake fuse is intact, you will then need to acquire a circuit
    view full answer...

  • Connecting Brake Controller Output Circuit to 7-Way of 2008 Dodge Ram 1500
  • If there is only 4 wires ran to the back of the 7-way you have installed on your 2006 Dodge Ram 1500 that would be why the brake controller circuit is not active on the 7-way. One of the wire you found near the 7-way is most likely the output circuit. You can use a circuit tester like the part # PTW2993 to test the circuits and if you find the correct one the brake controller will show a trailer connection on it's display. Or you could run a wire from the blue wire of the brake controller
    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...

  • Should there be a Small Amount of Voltage on Curt Brake Controller Red Wire on 2013 Kia Sorento
  • Yes that is normal. The power you are seeing is dead voltage, no amperage draw, and is normal for Curt brake controllers like the TriFlex, # C24VV, on your 2013 Kia Sorento.
    view full answer...

  • Troubleshooting Curt TriFlex Brake Controller on a 2017 Chevrolet Silverado 2500 With OL Code
  • The Curt TriFlex Trailer Brake Controller # C24VV does have a sleep mode that will not have any lights on when the controller is not being used. It sounds like you have a short somewhere in the brake wire that runs to the 7-way since your controller is trying to calibrate when there is not a trailer connected. That also explains why you are getting the OL afterwards. The short could be inside one of the connectors or the wiring may have chaffed somewhere on its way from the controller
    view full answer...

  • Troubleshooting 2 Red Line On Curt TriFlex Trailer Brake Controller # C24VV
  • The 2 red lines on the Curt TriFlex Trailer Brake Controller # C24VV indicates a power or ground wire connection issue. You will want to check the connectors to ensure they haven't loosened up or are sliding out of the connector. You can also connect the controller directly to a good 12 volt battery to ensure the controller itself is not faulty. Please let me know what vehicle and any adapters you may also have.
    view full answer...

  • Troubleshooting Electric Over Hydraulic Brakes Not Activating of Vehicle
  • It sounds like there may be an issue with the wiring in the trailer to the hydraulic brake actuator. When you installed the Adapter Module # DX35FR you did receive the trailer connected message. I have attached the instructions for the Adapter Module that shows several different wiring schematics for the popular hydraulic actuators. If yours is not listed let me know and I will help you find the correct wiring. It sounds like there may be issue with the power wire that is going
    view full answer...

  • Curt Brake Controller Installation on 1998 Chevrolet C/K Series Pickup with Long Bed
  • To help installation of the Curt TriFlex Trailer Brake Controller # C24VV go smoothly, you will want a 4-way connector, the universal wiring adapter for Curt brake controllers # C51515, and the universal installation kit # ETBC7. If you do not already have a 4-way connector on your pickup, you will want to begin by installing one. I recommend the Tow Ready T-One Vehicle Wiring Harness # 118315. This wiring harness plugs directly in your vehicle's pre-existing wiring with no cutting or
    view full answer...

  • Brake Controller Installation 2016 Toyota Tacoma Without Factory Trailer Connector
  • In addition to the brake controller you mentioned, the Curt # C24VV TriFlex and the Universal Wiring Pigtail, part # C51515, you'll also need our brake controller installation kit, part # 5506. The kit includes all the wire, circuit breakers and hardware you'll need to complete your installation. Start by locating the black and blue wires on your # PK11998 pigtail. The blue wire carries the output from the brake controller. The black wire carries 12-volts from the battery to any trailer
    view full answer...

  • Where Does a Brake Controller Plug In on a 2014 GMC Sierra 1500
  • On your 2014 GMC Sierra 1500 there is a junction box with a black cover on it located on the driver's side floorboard, way in the back, to the left of the brake pedal. There should be an empty spot to plug in the wiring harness located in the upper left corner. I have included a link to a video that should help. It is a different harness but it plugs into the same spot.
    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...

  • Troubleshooting Curt Trailer Brake Controller Installation On a 2014 Cadillac Escalade
  • It looks like the Curt Custom Wiring Adapter # C51451 is only confirmed to fit the 2015-2022 Cadillac Escalade. With you connecting it to a 2014 Escalade it is likely going to a connection that is not for the brake controller. On the 2014 you should be using a Universal Wiring Adapter # C51515 since the wires are not terminated into a connector but only cut and sealed at the ends. Then you will be able to connect a brake controller like the Curt TriFlex # C24VV. I have linked an article
    view full answer...

  • Curt Brake Controller Wiring Harness for 2018 Chevy Suburban
  • The Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51451 is a fit for your 2018 Chevy Suburban if you already have the factory tow package with the factory 7-way trailer connector. If you do not have the factory 7-way, then you will need the Replacement Custom Multi-Tow 7-Way and 4-Way Trailer Connectors # 30955 and will hardwire the wires present under your dash to the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515.
    view full answer...

  • Brake Controller Wiring Harness for 2015 GMC Sierra 1500 and Curt TriFlex Brake Controller
  • For your 2015 GMC Sierra 1500 and Curt TriFlex brake controller # C24VV you will need wiring harness # C51451 to plug the controller into your truck. I have linked instructions for both parts for you.
    view full answer...

  • How Does Brake Controller Install in 2014 GMC Sierra 1500 Using Factory Install Harness
  • The brake controller jumper wire you found in the glove box can be used to wire in the brake controller you have. I am not sure which controller you have but basically you'll plug the harness into the port under your dash for the brake controller install and then you'll wire it color for color to the brake controller's wiring and it will be wired in and ready to work.
    view full answer...

  • Brake Controller Install Harness and Brake Controller Recommendation for 2015 Chevy Silverado 1500
  • Yes, the Curt brake controller install harness part # C51451 that you referenced will allow you to install a Curt brake controller in your 2015 Chevy Silverado 1500 like the Curt TriFlex part # C24VV.
    view full answer...

  • Does Curt Brake Controller Install Harness part # C51451 Fit 2018 Chevy Silverado 2500HD
  • Yes, the Curt brake controller install harness part # C51451 that you referenced is a confirmed fit for your 2018 Chevy Silverado 2500 for installing a Curt brake controller like the Curt Triflex part # C24VV which would be a great option.
    view full answer...

  • Curt Brake Controller Wiring Adapter for a 2006 GMC Sierra
  • We do have a plug-in adapter for your 2006 GMC Sierra, but the Curt # C51451 that you referenced is a fit for Chevy Silverado and GMC Sierra pickups starting in 2014. For your 2006 Sierra you want the Curt # C51352 instead. This adapter will plug into the junction box beneath your vehicle's dash as is demonstrated in the attached photos.
    view full answer...

  • Brake Controller Install in 2014 GMC Sierra
  • The install procedure will depend on if you have a 1500 or a 2500/3500 Series. If your Sierra is a 1500 model, you will need a brake controller wiring adapter harness, part # C51451. The 2500 and 3500 series would have the tow package wiring that sits above where the driver's left knee sits. If you click the video link I've provided, you can see a controller being installed in a 2014 GMC Sierra 1500. The FAQ link I provided shows how to install a controller in the 2500/3500 model. The
    view full answer...

Info for these parts were:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Written by:
Laura H
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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