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  1. Trailer Brake Controller
  2. CURT
  3. Electric
  4. Proportional Controller
  5. Up to 4 Axles
  6. Plug-In
THIS ITEM IS NOT A FIT FOR
2016 Chevrolet Colorado
CURT

Curt Echo Under-Dash Bluetooth Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional

Part Number: C74SV
In Stock
$329.95
Trailer Brake Controller
Not Confirmed to Fit

2016 Chevrolet Colorado

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Towing? There's an app for that. This brake controller connects to your phone with Bluetooth so all your settings are right in your hand. The plug-and-play unit mounts under your dashboard, out of sight and out of your way. Great Prices for the best trailer brake controller from CURT. Curt Echo Under-Dash Bluetooth Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional part number C74SV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (17)
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  • Videos (1)
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CURT Trailer Brake Controller - C74SV

  • Electric
  • Proportional Controller
  • Up to 4 Axles
  • Plug-In
  • Under-Dash
  • CURT
  • Under-Dash Box
  • Multiple Trailers
  • Smartphone Display

Towing? There's an app for that. This brake controller connects to your phone with Bluetooth so all your settings are right in your hand. The plug-and-play unit mounts under your dashboard, out of sight and out of your way.


Features:

  • Proportional braking - Smooth, safe, and good for your brakes long-term
  • Bluetooth - Control your settings from your smartphone using the OneControl app
  • Hidden - Installs out of sight behind the dashboard
  • Great for a fleet - Swaps easily between multiple tow vehicles and trailers
  • Simple troubleshooting - Diagnostic LEDs are displayed on the main unit
  • Safe for your car - Built-in reverse polarity and short circuit protection
  • Plug-and-play - Custom-fit wiring harness
  • Install kit included - Mounting adhesive, zip ties, instructions, and quick reference guide


Specs:

  • Application: trailers with 1 to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
  • Main unit dimensions: 3-3/8" long x 3" wide x 7/8" thick
  • Smart device OS requirements:
    • Apple: 5.0 and newer
    • Android: 4.3 and newer
  • Warranty:
    • Limited lifetime on brake controller
    • Limited 1-year on wiring harness


Pair with other OneControl systems for convenient control of your trailer in one app!

  • True Course (C94VV - sold separately) prevents sway
  • Tire Linc (C54VV - sold separately) monitors tire pressure and temperatue

Quick Tip: The Bluetooth PIN for initially pairing to your smart device is located in the quick reference guide!


Note: If Bluetooth connection is lost, the brake controller will continue to function safely, using the most recently programmed settings. This brake controller is not compatible, but will not interfere, with Apple CarPlay or Android Auto.


The Curt Echo under-dash is all about convenience. With the main unit mounted out of sight beneath the dash, all you need is your smartphone to control the settings on the brake controller. You won't have to worry about banging your knee on a bulky controller, cluttering up your dash, or ruining the sleek look of your interior.


Towing with Your Smartphone and an App

The Echo is unique for giving you control of your towing through your smartphone. You can set the maximum braking output, adjust the braking sensitivity, apply the manual override - all from the OneControl app.


The Echo connects to the app via Bluetooth. You can save multiple trailer profiles in the app, a big plus if you have a fleet and want to be able to just select a pre-set configuration and get towing. And don't worry: after you've downloaded the app, you don't need to have data on to use the app with the brake controller. You'll be able to receive calls and texts and access your other apps.


OneControl App

Simple, intuitive, and user-friendly, the OneControl App makes it wicked easy to manage your settings and control your trailer.


how does the One Control app work

1. Manual Override

This big orange button in the middle of the app is your manual override. Press and hold the button, and the brake controller will smoothly apply the trailer brakes without applying your vehicle's brakes. This is perfect for stopping sway or controlling your trailer's momentum in an emergency.


Curt Echo Under-Dash App Manual Override Button

Quick tip: Put manual override right at your fingertips by adding this button (C83HR - sold separately) to your dash. The app must be running for the button to work, but it can be in the background while you use other apps on your phone. The button has an adhesive back and runs on a replaceable battery.


2. Brake Output Indicator

The outer ring gives you a visual indicator of how much power is being applied to the trailer brakes. This is determined by your max output setting.


3. Max Output

Braking output 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.


To set your maximum braking output, tap this button and increase or decrease using the + and - buttons. You want to set the braking output as high as you can without locking up the brakes.


4. Sensitivity Level

This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the max output level. This is a great adjustment to make when you're towing a heavy load and the trailer will need more umph to bring it to a stop so it doesn't push your vehicle forward.


Just like max output, if you need to change your sensitivity level, use the + and - buttons. If your vehicle takes too long to come to a stop, increase the setting. If it stops too abruptly, lower the setting. You may also need to adjust the sensitivity based on your own preferences, or when the trailer load or road conditions change.


5. Vehicle Hazard Lights

If you turn on your vehicle's hazard lights, there's a chance the trailer brakes will pulse on and off as the lights flash. Turn this setting on any time you activate your hazard lights to prevent this problem.


Save Multiple Trailer Profiles

Curt Echo App saves multiple trailer profiles

Get on the road faster by saving your settings. With the app, you can add and store multiple profiles for both trailers and vehicles so that your preferred settings will be ready to go as soon as you hook up. This is perfect if you own a fleet and don't want to have to reset the controller every time you swap out trailers. You'll have the ideal settings saved and waiting for you. To switch between profiles, just swipe left or right.


OneControl: One-Stop App for Towing

If you like the idea of monitoring your trailer from your phone, the other OneControl systems could be a great fit for you.


The Curt True Course (C94VV - sold separately) is an advanced Bluetooth sway control system that automatically triggers the trailer brakes (independent of the vehicle's brakes and the brake controller) when it detects dangerous trailer movement. The Curt Tire Linc (C54VV - sold separately) Bluetooth TPMS monitors the temperature and pressure of your trailer tires. All of these systems use the OneControl app so you can manage all of them in the same place on your phone.


Plug-and-Play Installation

You won't be banging your knee on a bulky brake controller or interfering with your vehicle's lower airbags because the main unit mounts out of sight under your dash. This product comes with an adhesive pad and 4 zip ties to make it easy to mount anywhere. (Just don't zip-tie the box to wiring or cables that can shift as you drive!) Thanks to the 3-axis accelerometer, the main unit can be positioned at any angle. No matter how you install it, the unit will sense the direction of travel and deliver smooth, even braking.


Curt Echo Under-Dash Main Unit Module

The included custom-fit adapter plugs into the port on your vehicle's built-in brake control wiring harness, which you'll find underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal. Once you're plugged into your factory port, just plug the other end of the adapter into the Echo. No hardwiring needed!


Once that's done, download the OneControl app on your Apple or Android smartphone and wirelessly pair the unit to your phone via Bluetooth, following the in-app instructions. It should take about 5 seconds for them to pair. Once paired, the LED light on the unit will turn a solid blue. Plug in your trailer's 7-way and let the whole system calibrate for another 5 seconds. When the LED turns green, configure your desired trailer brake settings and save it as a profile. Then you're ready to tow!


Curt Echo Under-Dash LED Troubleshoot Cheat Sheet

Note: 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 controller 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 hard; 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 Echo under-dash 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 ensure that your trailer slows at the same rate. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.



51190 Curt Echo Wireless Trailer Brake Controller - Under Dash - Smart Phone Bluetooth Connection - One Control App for Brake Controller - 1 to 4 Axles - Proportional

51352 Curt Quick Plug Brake Control Adaptor Harness

Installation Details C74SV Installation instructionsAlternate Instructions C74SV Installation instructions


California residents: click here


Video of Curt Echo Under-Dash Bluetooth Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Curt Echo Brake Controllers Manufacturer Spotlight

Ratings & Reviews

4.7

216 reviews
Towing? There's an app for that. This brake controller connects to your phone with Bluetooth so all your settings are right in your hand. The plug-and-play unit mounts under your dashboard, out of sight and out of your way.

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Very nice product and well laid out. Came with everything to make the job easy.



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Easy setup and operation.



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Would not connect to Blue Tooth after install and app download. This seems to be a trend with these controllers,from what I was told.E-Trailer provided a return label.



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Good product. Small size. App could have been easier to setup.



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Very pleased with the ease of install and how it functions.



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Although this seems like a great idea, the controller app from Curt/Lippert only works on a very recent cell phone or on an Android-based car stereo head unit. There are no factory Android car stereos available or aftermarket Android head units from the major players such as Pioneer, JVC, Kenwood, Alpine. The app is not Apple Car Kit or Android Auto enabled. This basically means you need to play with your cell phone while driving to adjust the brake controller. Even touching your phone while driving is illegal in many, many states. It really doesn't matter how good or bad the brake controller is if you can't use it. The same app is used for other Curt/Lippert Bluetooth Echo brake controllers and for their anti-sway controller and trailer tire pressure monitors. One has to wonder why this is even available for sale. I plan to simply avoid all Curt/Lippert Bluetooth trailer equipment in the future.



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Works Great. Very satisfied



by:

Great service! Thanks Zach!



by:

Easy installation and product works exactly as it should.



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I have to say, the unit works pretty well... Took some adjusting at first and sometimes have to still make small adjustments when the trailer brakes grab a little to much while coming to a stop. Easy installation and setup and does the job.



by: Harold03/25/2026

Associate was very helpful email several options and price that l could choose Received order in timely manner was easy to install less than 10 minutes Will definitely use these guys again for towing needs



by: Matthew 11/25/2023

The break controller worked seamlessly. Profiles are easy to set up and it has very reliable Bluetooth connectivity with my phone. Installation was really easy on my Honda Pilot!



by: Pete D.07/28/2016

The Curt electric brake controller was the easiest installation I have ever had. I ordered the custom wiring adapter along with the brake controller; it all came with easy to follow instructions and it only took about 30 minutes to install the entire unit. I had done some checking around to get estimates from various companies which do the installations and their costs were around $300.00. The Curt unit including the adapter wiring was $**.00 and a very easy install. I used the brake controller during a recent camping trip on which I was pulling a 24 foot camp trailer. The controller worked great and I could easily control the trailer in some extreme mountainous terrains in Wyoming.

Pete D. profile picture

Pete D.

7/28/2017

Still works great after a year no problems at all.



by: Alan03/12/2024

Do not buy either the Curt Under-Dash or plug-in Wireless brake controllers until Lippert fixes the phone app. I’ve used both happily with the old ECHO Smart Control app. I could use the remote manual button with the phone app not even running. As one would reasonably expect the button talked to the controller directly via Bluetooth. The new OneControl Auto app must be running and in the foreground to use the manual remote! And the most recent version of ECHO Smart Control is non-functional, it just tells you to install OneControl Auto.



by: JimB 08/26/2024

This is my first proportional brake controller. Stopping is much smoother without sacrificing safety. Communication by bluetooth makes for a clean installation.



by: Michael06/26/2025

Don’t even know it’s there, set it and forget it.



by: James 12/19/2023

This was relatively easy to install under the dash of our 2021 Jeep Grand Cherokee, especially since ours has the factory Trailer Tow Package and therefore an existing pigtail connector ready to connect to the brake controller. The Curt wiring adapter made it super easy to connect the Brake Controller to the vehicle's wiring harness. The controller was easy to calibrate and worked seamlessly while we're towing a rented trailer. We used a dedicated (older) cell phone to operate it while we're towing to avoid any potential interference from other apps rather than using our regular phone on which we receive phone calls texts, etc. This was our first time towing a trailer and this easy-to-use Brake Controller helped make us feel safe and comfortable. Highly recommended.



by: Mark W. 05/29/2017

Bought this trailer controller cable with a Curt Trailer Brake Controller. I dont know if it works or not. I installed this along with thr trailer brake controller at the same time. Nothing works. No lights power up on the controller. I highly respect Curt Products as I have many installed on my truck, but I'm disappointed with this combo purchase.


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Show More Reviews

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  • Trailer Brakes Will Not Work and 2006 Chevy Silverado Lights Malfunction w/Curt Brake Controller
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  • Curt Brake Controller Wiring Adapter for a 2006 GMC Sierra
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    view full answer...
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  • How to Install a Curt Brake Controller in a 2006 Chevy Silverado 1500
    You have installed correctly all of the components you referenced. The # C51110, # C51352, and the # HM40975. The issue you are experiencing is that the tow package wiring under the hood of your truck hasn't been completed like you suspected. The blue wire will need to get run to the brake output circuit of the 7-way you installed. Since this circuit isn't connected to anything that means the 7-wires that are at the rear of your vehicle aren't all ran. You will need to run a length of...
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  • Location to Install Brake Controller Power Fuse on 2003 GMC Sierra
    I am assuming you are speaking of the fuse that activates the power feed to the brake controller. The 30 amp fuse is installed in the power distribution box as shown in the photo I have edited. The power distribution box is located under the hood, on the drivers side on the fender well. I have linked you to an FAQ article that describes how to install a brake controller on a 2003 GMC Sierra.
    view full answer...
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  • Brake Controller Does Not Work After Installation on a 2005 Chevy Silverado
    On certain year Chevy trucks there are additional connections that need to be made under the hood to make everything fully functional. I have included a link to an FAQ article to help you. Make sure that you are plugging in the harness into the spot on the top row, second from the left. The Curt harness you should be using is # C51352. With the brake controller plugged into the right spot and all the under hood connections made and fuses in place the brake controller should work just fine.
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  • Parts Needed and Method to Install Curt Trailer Brake Controller on 2007 Chevy Silverado
    You may or may not need an additional wiring harness to install the # C84VV. If your 2007 Chevy Silverado is the new body style you will not necessarily need the harness, but if it is a Classic you will need harness # C51352 because there is a port under the dash on the floor, on the far left. One end plugs into the controller, the other end plugs into the port. The port is located in a junction box. There is a black cover on the box. Remove the cover and plug in the harness in the top...
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  • Curt Brake Controller Not Working Correctly After Moving It From 2006 Silverado to 2001 Model
    If you are using the same wiring adapter in the 2001 as you had in the 2006 Silverado, it would explain the problem you're having. Both model years use the same plug, but after the 2002 model year, GM changed the pinout on the connector under the dash. The 2006 Silverado uses the # C51352 wiring adapter, while the 2001 model would use the # C51342. I've edited a photo for you showing the difference between the two connectors, you can move the red wire to the correct location by removing...
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  • Troubleshooting Curt Brake Control Harness # C51352 Installation in 2007 Chevrolet Silverado Classic
    The Curt Brake Control Harness you reference, part # C51352, is compatible with both time-delayed and proportional brake controllers from Curt and is intended for vehicles with factory tow package wiring. As you noted, the connection port for the vehicle-side connector is under the dash in the electric junction box. The box interior is shown in the photo provided; the correct connection port for the harness (the second one from left on the top row) is highlighted in red. There are one...
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  • Recommended Wiring Harness For A Curt TriFlex Trailer Brake Controller In A 2003 Chevy Silverado
    The part #15085418 you referenced comes back as an OEM GM wiring harness, which you would have to go to a GM dealership to purchase. If you're just needing a wiring harness for the Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional # C24VV that you linked to so you can plug it into your 2003 Chevy Silverado with factory tow package then you can use the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51352. This wiring harness will plug into...
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  • Brake Controller Recommendation for a 2005 Chevy Tahoe with Factory Trailer Connector
    The Curt Echo Under-Dash Brake Controller # C27JR is an excellent choice for your 2005 Chevy Tahoe. I really like it because you mount it under your dash and then you have a clutter-free brake controller to use! The correct wiring kit to connect this to the tow package on your Tahoe is the Curt Adapter # C51352. This gives you a simple plug-and-play installation that takes any guesswork out of the wiring. We have a variety of other controllers to choose from but the Echo Under-Dash is...
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  • Curt Trailer Brake Controller Does Not Power On when Installed on a 2007 GMC Sierra Classic
    There may actually be some additional connections that you will need to make under the hood. Take a look at the article I have linked that covers everything that you will need to do under the hood on your 2007 GMC Sierra Classic. First make sure you are plugged into the spot in the junction box in the top row, second from the left. Then make sure you have all the connections and fuses in the correct locations. It seems strange but also make sure the fuse you are using is a good fuse and...
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  • Curt TriFlex Brake Controller C24VV Does Not Show Red Dot on Display After Installation
    The Curt TriFlex Trailer Brake Controller, part # C24VV, and the matching harness for your 2007 Chevrolet Silverado Classic, part # C51352, will work with your vehicle as long as your 7-way connector on your rear bumper is not the type that includes LED test lights. Such 7-way connectors are not compatible with the Curt TriFlex. It is critical that before installing the controller the negative battery terminal be disconnected to avoid potential damage to the unit. Also, the trailer must...
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  • Troubleshooting Curt Tri-Flex # C51140 Brake Controller Installation in 2006 Chevrolet Silverado
    Thank you for your recent purchases from etrailer.com. The quick-connect brake controller adapter harness you purchased along with your brake controller, part # C51352, is the correct one for your 2006 Silverado. Brake controller installation in your truck, if it did not have a factory tow package, requires you to complete some electrical connections and install fuses in the engine compartment, at the power distribution box. Since you also ordered a 7-way, I will presume your truck did...
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  • Install Harness for 2005 Chevy Tahoe for Curt Spectrum Brake Controller
    Yes the correct brake controller install harness for your 2005 Chevy Tahoe is the part # C51352 to install the Curt Spectrum # C51170 that you mentioned.
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  • No power to New Trailer Brake Controller Install on a 2007 GMC Sierra Classic
    You will likely have to make at least one connection under the hood of your 2007 GMC Sierra Classic to power the brake controller. You may also need a fuse. I have included a link to the right that shows the connections that you will need to make under the hood to make everything fully functional.
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  • Parts Needed To Install Curt Assure Trailer Brake Controller In 2007 Chevy Silverado 2500HD Classic
    I have another option for you, but your 2007 Chevrolet Silverado 2500HD Classic has a factory trailer brake controller port so there is no need to cut any wires. To replace your current controller with the Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional # C49UR you will just need the # C51352 which will plug into the factory trailer brake controller port underneath the dash of your truck. I included video reviews for both of the products mentioned...
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  • Parts Needed to Install a Trailer Brake Controller on a 1997 Chevrolet C/K Series Pickup
    A brake controller wiring harness is not available for the 1997 Chevy K 1500 pickup. You will need to hardwire in a brake controller using 3 parts: a brake controller, a 4 and 7 way installation kit, and a 4-Way trailer wiring harness. If your truck already has a 4-Way trailer connector then you will not need to add one. But if it does not have any trailer wiring you will need to first install # 118315. I have linked installation instructions for you. Next you will need a 4 and 7 way...
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  • Can Curt TriFlex Trailer Brake Controller # C24VV Be Temporarily Disabled When Backing Up
    I did some research on this controller for your 2006 Chevrolet Silverado, and there are no features available that will turn the Curt TriFlex Brake Controller, part # C24VV off. The best way to temporarily disable the controller when you intend to back up is to unplug the trailer. If you were to unplug the controller, it would have to be reset when it is plugged back in. I spoke with my contact at Curt and they strongly advised against doing this because if someone failed to reconnect the...
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  • Most Economical Way to Add 7-Way & Brake Controller to 2003 Chevy Silverado 1500
    Hi Michael, What you'll need to do to add a 7-way to your 2003 Chevy Silverado 1500 is hardwire the Pollak 7-Pole, RV-Style Trailer Connector Socket w/ Wiring Harness and Mounting Bracket # PK11898. Since you don't have a factory 7-way, the wires to attach to this harness will be above the spare tire, and splice them. I have added a link below to a help article which shows you exactly what to do and where the wires are on your truck. And while 7-way doesn't come with a 4-way socket,...
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  • What Brake Controller Adapter for Curt Brake Controller on 2004 Chevy Silverado
    The correct brake controller adapter to use with your Curt Venturer Brake Controller # C74VV will be part # C51352, which will plug into the factory brake controller port. I've linked a installation video of this controller using the adapter for you to have a look at, as well.
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  • Troubleshooting Brake Controller Installation On 2003 GMC 3500
    When checking the brake output circuit of a 7-Way there should not be 12 volts of power all the time. A Curt brake controller will have what is termed 'dead' voltage at idle. This means there is voltage but no amperage draw. You can test for amperage instead of voltage to see if that is the case. If so, then you do not have a problem. If you are showing amperage draw that would indicate a short somewhere or possibly a problem with the brake controller. For a Curt brake controller, and if...
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  • Is the Curt Custom Wiring Adapter # C51352 the Same Part as the Curt 51352?
    We have the part! The harness you need is the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51352. This is the exact same as the Curt part number 51352. I went ahead and attached a demo video of the harness for your convenience.
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  • Does Priums IQ Controller Need to be Replaced if Manual Override Slide Doesn't Work
    Yes, if your Tekonsha Primus IQ TK90160 is sending power when your foot is on your 2006 GMC Sierra 3500 brake pedal but not when you're using the manual override then something is messed up internally and you need to replace the controller. It's common for the the manual slide to work and the brake pedal to not work (it just means something is mis-wired), but with your situation you need a new controller. The Primus IQ has a limited lifetime warranty so you can try pursuing that, but I...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Alex H
Updated by:
Alex H
Employee Amanda K
Updated by:
Amanda K
Employee Sabrina W
Written by:
Sabrina W

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