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  1. Trailer Brake Controller
  2. GMC
  3. Sierra 3500
  4. 2024
  5. CURT
FITS 2024 GMC Sierra 3500
Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional

Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional

Item # C51180
Our Price: $219.94
Trailer Brake Controller
Confirmed to Fit
2024 GMC Sierra 3500

with factory Tow Package

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Call etrailer.com at 1-800-940-8924 for expert service. We are your GMC trailer brake controller experts, and offer a great price. etrailer.com carries a complete line of CURT products for your GMC Sierra 3500 2024. Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional part C51180 from CURT can be ordered online at etrailer.com. Complete trailer brake controller installation instructions and technical support.
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2024 GMC Sierra 3500 - Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional

  • Up to 2 Axles
  • Proportional Controller
  • CURT
  • Hidden
  • Smartphone Display

Bluetooth-enabled brake controller lets you monitor and control your towing directly from your phone. Create multiple trailer profiles and tweak your settings in the app. One step, plug-and-play installation into your 7-way.


Features:

  • Activate your trailer brakes in proportion to your GMC Sierra 3500's braking
    • Automatically adjusts trailer's braking based on deceleration of tow GMC Sierra 3500
  • Control and monitor your towing from your smartphone with the OneControl app
    • Adjust sensitivity and max power output
    • Press the manual override button in the app to control trailer sway or stop in an emergency
  • Transfer between GMC Sierra 3500s easily - great for mix and matching your fleet of trucks and trailers
    • 1-Step set up: plug in and go
    • Quickly switch between settings for different GMC Sierra 3500s and trailers, saved as a profile in the app
  • Troubleshoot any problems with the LED lights on the plug-in unit
  • Enjoy convenient towing for years to come with a long-lasting system
    • Weather-resistant with internal components sealed off from moisture
    • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
    • Built-in reverse polarity and short circuit protection
  • Install in 1 plug-and-play step - no tools, no splicing, no wiring
    • Plug unit in between your 7-way trailer connection
    • Included strap helps secure the unit in place
  • Includes plug-in unit, instructions, and quick reference guide
    • Bluetooth PIN for initial pairing to your smart device located in quick reference guide
  • 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 your tire pressure and temperature
  • Assembled in the USA


Specs:

  • Application: trailers with up to 2 axles (4 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
  • Plug-in unit dimensions:
    • Length: 6-5/8"
    • GMC Sierra 3500-side width: 1-5/8"
    • Trailer-side width: 2-7/8"
  • Smart device OS requirements:
    • Apple: 5.0 and newer
    • Android: 4.3 and newer
  • Limited lifetime warranty


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.


One-Step Installation

The Curt Echo is unique for its plug-and-play installation. With no wiring, modules, or knobs to install, setting up the Echo is a breeze.


Curt Echo Wireless Brake Controller Installation

The main unit plugs into the 7-way at the rear of your GMC Sierra 3500 and provides a port for plugging in your 7-way trailer connector. Use the included strap, found inside the cap, to secure the Echo in place. It will help ensure a constant connection between GMC Sierra 3500 and trailer.


That 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 in the app and save it as a profile. Then you're ready to tow!


Note: See etrailer.com's exclusive 7-way upgrade kit for brake controller installation (ETBC7L - sold separately) if you don't already have a 7-way plug at the back of your GMC Sierra 3500.


Control Your Towing with Your Smartphone and an App

Besides the crazy-easy installation, 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.


Completely wireless, the Echo connects to the app via Bluetooth. You can save multiple towing 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.


User-Friendly 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 GMC Sierra 3500's brakes. This is perfect for stopping sway or controlling your trailer's momentum in an emergency.


Curt Echo 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 pad for a quick-stick installation and includes an easily 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. Once you've set up the brake controller the first time, you shouldn't need to adjust the settings until the trailer load changes, you switch trailers, or road conditions change.


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 GMC Sierra 3500 forward.


Just like max output, if you need to change your sensitivity level, use the + and - buttons. If your GMC Sierra 3500 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. GMC Sierra 3500 Hazard Lights

If you turn on your GMC Sierra 3500'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 GMC Sierra 3500s 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 trucks, trailers, or drivers. 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 GMC Sierra 3500'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.


LED Status Indicator

troubleshooting Echo brake controller

The LED indicator light on the top of the plug-in module will show you when the brake controller is connected. You can also check the LED for simple diagnostics when you need to troubleshoot.


Weatherproof Construction

Is the Curt Echo weatherproof

Because the Echo mounts outside the GMC Sierra 3500, it's designed for maximum weather resistance. The unit is filled with an epoxy resin that seals off the internal components from moisture and the elements. The Echo also has a soft locking tab for connecting to your 7-way plug that reduces vibration and helps ensure a constant connection.


Proportional Braking

What is proportional Braking

The Curt Echo brake controller comes equipped with proportional braking to give you the best towing experience. Proportional braking means that your trailer brakes mimic your tow GMC Sierra 3500's brakes. If you slam on the brakes in your GMC Sierra 3500, 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 GMC Sierra 3500's braking. This saves wear and tear on the tires and the brakes on both your GMC Sierra 3500 and trailer.


The Echo uses an internal 3-axis accelerometer to sense how your GMC Sierra 3500 is braking so it can send the right amount of braking power to your trailer. It measures the inertia of your tow GMC Sierra 3500 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.



51180 Curt Echo Wireless Trailer Brake Controller - Smart Phone Bluetooth Connection - One Control App for Brake Controller - 1 to 2 Axles - Proportional

Installation Details C51180 Installation instructions

Customer Satisfaction Score:


Customer Reviews

Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional - C51180

Average Customer Rating:  4.5 out of 5 stars   (1439 Customer Reviews)

Bluetooth-enabled brake controller lets you monitor and control your towing directly from your phone. Create multiple trailer profiles and tweak your settings in the app. One step, plug-and-play installation into your 7-way.

by:

I like the fact that I have a proportional brake controller I can stick in my glove box. It doesn’t have to be hardwired to the vehicle which is nice because I can use it on different applications. This one is definitely a plus over time delay brake controllers.

Mark

7/3/2023

After an initial issue and replacement, the product has worked very well. Having an adjustable proportional controller that you can throw in your glove box is pretty handy. It’s response time is very quick.



by:
2014 Dodge Ram Pickup

The factory brake controller on our 2014 Ram 3500 would never give us good braking for our 5th wheel. The best voltage that the controller would provide to the electric brakes was just under 10 volts; and that was at full settings. Dealer said that this year vehicle never would give more voltage.

This etrailer brake controller was not only easy to set up, it does a fantastic job stopping our trailer.

Finally peace of mind towing.

James B.

5/21/2024

Still works great. Nice to have confidence in the ability to stop as necessary in any circumstances.



by:

We have been using the Echo wireless brake controller for about a year with our little travel trailer. In general it works well, no problems with the installation or connection to our phones. There is a little rubber strap that supposedly keeps it attached to the vehicle, but it is pretty useless. We keep a bunch of 1cm wide zip ties in the car in order to secure the unit to our car.

Mark

3/11/2024

The echo wireless works well. It is easy to setup for different trailers or road conditions. The new software update improves connectivity. The little safety strap that it came with is long gone, and it was useless to begin with. I just keep a bag of zip ties in the car to secure the echo to the cars seven pin connector.

Etrailer Expert

Mike L.

3/12/2024

@Mark That's a nice solution!


by:

Works perfect with Jeep Wrangler and Rp od!

Tommie

10/15/2023

Still doing great and have recommended to friends .

Etrailer Expert

Mike L.

11/7/2023

@Tommie That's outstanding, thanks for the recommendations. We really appreciate that!


by:

Customer service response is prompt. Order arrived quickly. I’ve attached, synced, and tested the controller on my 2020 Tacoma, pulling my 16ft travel trailer. Lights and app indicate it is working. I’m still testing adjustments, as I’ve never used a brake controller. I saw some reviews that complained about brake pulsing at low speeds. I have NOT experienced this problem. Manual actuation works well at low speed. Information says app must run in the foreground. I’m trying to determine what that means. Can I open the app and switch to another app, or does the app need to stay on constant display?

Etrailer Expert

Brooke M.

2/26/2024

Yes! The app should be the one on constant display on your phone screen; the one you are viewing. It looks like the reason is if its running in the background, if you have a different app on display while towing, it can cause delays in breaking times. Best to be safe and just run the OneControl Auto app when towing.



by:
2015 Chevrolet Colorado

Overall, I like the way the unit operates, with the Bluetooth portability. It’s easy to move from vehicle to vehicle. I also know it works, as I encountered a hard braking incident in traffic, and everything responded as hoped.


The build quality suffers, as the little rubber strap and hook to “fasten” it with quickly broke. I replaced it with a stainless nut and bolt, and hook it around the fold down cap to keep it in place. Otherwise, I’d rate it a higher!



by:

This controller has worked flawless for me. I’ve used it on a 2009 Lexus RX350, 2022 Lexus RX350, and 2022 Lexus GX460. Never an issue connecting or operating. My father, on the other hand, has the exact controller for use with his 2018 Ford F-150, and has had many issues with connection and operation. I love it’s modularity and simplicity.

Dan

3/13/2024

Still using this controller frequently, even though my GX has a pigtail for a wired controller. This is just so simple and quick to plug in when I need it, and take out when I don’t. Zero flaws, zero hiccups, zero issues.



by:

Had it working within minutes of taking out of the box. Controller works well. it remembers the last setting which is helpful. I was able to set up an profile for driving the highway and a separate profile for when I am backing up (don't need as much brake).

Glad the unit had strap, although it is a little difficult to secure and does need to be checked.

Kathy

5/2/2024

3.5 great years. No issues. Then Yesterday I was forced to move to a new app to communicate with the controller. This is NOT cool. New app was difficult to connect. Then I find out I must have location services turned on for it to work. This is an invasion of my privacy just for me to control my trailer safely. App has to be running and in the foreground - what on earth???? I want to be able to use my phone, run maps etc. Basically the ability to use my controller as I intended when I spent my money has been taken from me. I feel robbed.



by:

I love the ease of use and simplicity of it, however.
I use it on my pusher MH and it will not keep connectivity. I think it's because of the distance and obstacles.

I would highly recommend this product for a pick up application.



by:

Brake controller works well, but I would like to see a more substantial connection to the power socket on the car. Velcor is provided, but I would prefer something that ties to the car's frame. The way it is, I feel like the controller could fall off on a rough road.



by:
2019 Honda Ridgeline

The Curt Wireless brake controller installed easily on my 2019 Honda Ridgeline for towing my 24' travel trailer. It worked well on the one occasion that I had to use it. Nice to have the visual in the app on how the brakes were being applied.



by:
Chevrolet Tahoe

A great controller. It was simple to setup and use. I love the ability to use it in different vehicles ---- and no wiring hassle. Plug and play, make a couple adjustments and it worked like promised. I have showed it to several friends, who were totally amazed, had no idea there was a product like it out there. Towing a 18ft enclosed trailer with a Tahoe presently.



by:

The Echo is a convenient trailer brake. It's easy to set up and use every time I hook up my trailer. I use Bluetooth from an old smartphone mounted to the left of of my steering wheel so I can keep my cell phone free.

The only problem is that the rubber strap kept getting un latched from the rubber pin. So I just use two bungee-balls to keep the ECHO connected to the car harness and the trailer plug. (see Photo)



by:

Works amazingly well after the brief learning curve. You just can’t over think the process and do it. What a difference not having to install a brake controller on a new vehicle. I would buy it again.



by:

So far it's doing exactly as it was designed to do. Only issue is that stupid rubber strap. It has a button on it and as I was trying to loop this thing over the plug door, it flew off. Why would you make one removable? In any case, I put a zip tie around it. I was lucky to find the button on the ground and tried it again only for it to fly of once again. I like the controller how it works and it's simplicity



by:

This product has been excellent. The connectivity is immediate, even without opening the app. My bluetooth button has always worked simply. The colored lights are simple and communicative. I love the ease and lack of setup.

On the flap, the corner of the thumb tab has broken off. Seems within regular wear and tear for towing.



by:

Got delivered in a timely manner was in great condition. Just activated it this morning. Followed instructions ran into trouble when connecting to it with the app. It needs to be connected to your trailer as well to activate it so it can be located when searching for it. Setting it up was ok after that. I hooked it up and moved around some while using breaks on truck. Used the direct break on phone to see if it would stop, it did. Will use it sometime after I figure out the truck towing settings, sensors.



by:
2021 Ram 1500

Took a little patience but it paired. Added a little wd40 to trailer 7way...and everything works! The baseline setup was perfect for my single axle travel trailer.



by:

Initially wouldn’t connect to iPhone but after uninstall/reinstall of app it was fine. After literally traveling around the entire US I have to say it was a blessing with plug-and-play simplicity and total control over braking parameters. The phone lost Bluetooth connection a few times while traveling but the controller maintains the program so no big deal. For me it was nice to see the braking rate on the phone graphic. GREAT PRODUCT! 5 stars!



by:

I'm having trouble with it on my small trailer locking up the brakes

Etrailer Expert

Jenny N.

2/9/2024

Thank you for reaching out. Have you been able to adjust the output and sensitivity on the controller? Lowering the settings can prevent the brakes from locking up.



by:

Simple and quick way to set up a vehicle for trailer brakes. Cost effective, too, as you can use it for multiple tow vehicles. Easy to pair, I use an older “obsolete” iPhone with Bluetooth instead of my everyday iPhone. Be careful, though, this one is a replacement for one that vanished while camper was in for service.



by:

As long as you follow the directions for hooking it up precisely, it works marvelously. Especially, if like us, no OEM brake controller was available for our Jeep Grand Cherokee.

I give it a low rating, however, because it is made very cheaply. Just from regular use (plugging it in and unplugging it), the unit cracked, and then after 1-2 more uses it completely fell apart. See the pictures.

Etrailer Expert

Jenny N.

11/17/2022

I wanted to let you know that the controller does have a 1 year warranty and I have sent the warranty return instructions in a separate email to you.



by:

The manufacturer changed the App for this (installing the Curt App requests a different app be installed), the App in the videos is no longer valid.

Instead of the Curt app, it tells you to download an app from Lipert.

The app also requires setting up an account with Lipert. This is completely unnecessary, it's a bluetooth device, it does not require any internet access at all.

The app also asked for Location Services, again this is completely unnecessary, the app does not need to know where it is located to connect to a bluetooth device.

Companies need to stop trying to harvest every bit of data and sell it to the highest bidder.

I would return this device if I could, these types of egregious data scraping are getting out of hand.



by:

It is a new year and this five start rated product is now a three star. The reason being is the forced update to the "Lippert One Control" app - away from its original CURT app. The Lippert One Control app is not working with iOS. It is a known problem with BT, location, font size, screen brightness, and zoom. Currently, one has to restore the Display Settings on iPhone to the default status to make the app work. It gets stuck on the "Accept/Cancel" screen because of font/zoom settings. Though working with Lippert support, it's 2.20.24 and the app is only functional when these default settings are applied. The default settings get applied to the entire phone making my phone impossible to see, to read, to determine color. The font is tiny, it's not bright, I cannot zoom, so I'm not sure what's taking so long for Lippert developers to get updates rolled out. The forced update to the Lippert One Control app rolled out in late 2023 and it never worked. Reviews in App Store are 1.3 and issues are still compounding. The brake controller may work without the app but the settings you need may not be the presets. I could tell the controller was not how I set it up on CURT app, so I had to drive without a brake controller. Until App Store reviews indicate consistent excellent status as the CURT app did, without rendering your own utility worthless, I cannot recommend this innovative and wonderful product. It worked well under CURT but Lippert still hasn't figured out what is going on and did not think more broadly when developing. Great product if it worked!



by:

When package arrived, the outside box was fine but the inside package was damaged and crushed. Product inside looks fine but we were going to resell this as new to a customer. It doesn't look good on us if we try to sell something that already looks beat up. Whoever packed this item knew that the product packaging was beat up.

Etrailer Expert

Jenny N.

4/1/2024

I am sorry to hear that it arrived this way. I will let our shipping department know and I will have our Customer Service team reach out to you.


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  • Easiest Way To Wire A 7-Way With Brake Controller To 2019 BMW X5
    I do have an option for you but there is not a 7-way custom connector available for the 2019 BMW X5. You will need to use the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit part # 119250KIT to install a 4-way flat on the BMW and then a 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L for the 7-Way. Once you have the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation installed you can plug your...
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  • Hitch, Weight Distribution and Brake Controller Recommendations for a 2017 Toyota Sienna XLE
    We can get you everything you need for towing with your 2017 Toyota Sienna XLE. By plastic shield, I believe you are referring to the appearance panel underneath the Sienna, and that will have to trimmed a bit in each of the hitches available for the vehicle. A great Class III hitch would be the Curt # C13105, which is rated for weight distribution and has been given a nearly 5-star review on our site by the over 500 customers that have rated it. As for a brake controller, the wireless...
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  • Is a Brake Controller Plug and Play Wiring Harness Available for a 2003 Mercedes ML 350
    There is not an aftermarket plug and play brake controller wiring connector available for the 2003 Mercedes ML 350. You may be able to purchase one from the vehicle dealer though. I spoke with my contact at Tekonsha and his advice is that you should take your Mercedes M Class vehicle to the dealer to have a brake controller installed. The Mercedes vehicles have very sensitive wiring and splicing into the brake circuit or power on the vehicle can cause issues. If you have wiring experience...
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  • Recommended Tow Package and Brake Controller for 2022 Hyundai Tucson
    The Draw-Tite Max-Frame # DT22MR is a great hitch for your 2022 Hyundai Tucson! For wiring we'll need to start off with the T-One # CU94FR which gets us the basic trailer light functions. To add the rest of the functions needed for a brake controller we need an adapter like you mentioned. The correct one just depends on what kind of brake controller you're wanting to use. For a standard brake controller like the Prodigy P3 # 90195 you'll need the Wiring Harness # ETBC7 but if you're wanting...
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  • Parts Needed to Install Curt Echo Mobile Brake Controller In 2022 Hyundai Tucson
    To install the Curt Echo Mobile brake controller # C51180 on your 2022 Hyundai Tucson you'd need to have an active 7-way installed. To do that you'd first need to have a 4-way installed like with part # CU94FR (if you have one already you can skip this), and then you need the 7-way install kit designed for use with the Echo part # ETBC7L which will convert the 4-way to a 7-way and comes with wiring needed to activate the 12 volt accessory circuit.
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  • Is there a Brake Controller I Can Use on Two Vehicles?
    Yes, there is a brake controller that will work on both a 2016 Toyota Highlander and a 2010 Toyota Tacoma. It is the Curt Echo item # C51180. The Curt Echo attaches to your vehicles 7-way connector. It is a proportional brake controller that activates your trailer's brakes when your vehicle decelerates. The Echo is unique in that it does not require you to hardwire it into your vehicle. It is controlled by an app on your cell phone. This makes it extremely versatile and you can move it...
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  • Is Curt Echo Trailer Brake Controller Compatible With Curt 7-Way Wiring on a 2018 Honda Pilot?
    Yes, the Curt Echo Wireless Brake Controller # C51180 will work when connected to the Curt T-Connector Vehicle Wiring Harness # CU86FR on your 2018 Honda Pilot. This controller uses the input from the brake lights going to the trailer to send power from the charge line circuit on the 7-Way to the brakes. You might also consider the Curt Echo In-Line Bluetooth Brake Controller # C79DR if you prefer to not have to remove and store the Echo device above when not in use. This plugs in behind...
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  • Brake Controller Mounting Location on 2010 Toyota Tundra with Knee Airbags
    From what I have been able to research, I have found a few possible solutions. You could mount the controller to the right of the airbag door, as shown in the video I will link you to. Or, you could use the Curt Echo Brake Controller, part # C51180. This controller would plug into the 7-way connector on the vehicle, inline between the vehicle and trailer. The controller is operated by your smartphone using an app. A second option would be to mount the controller in the dash pocket...
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  • Brake Controller Wiring Harness for a Reese Brake Controller on a 2014 Ram 1500
    The issue is that Dodge started using the Powernet electrical system starting in the 2013 model year. This is a multiplex wiring systems so it is more complicated than pretty much everything else that came before it. A regular harness will not work so they developed a special harness just for this system and it is the only one that you can use. However, you do not need to run the additional wiring back to a third brake light wire. Everything still plugs in under the dash. The harness...
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Info for this part was:

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