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

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

Item # C51140
Our Price: $107.89
You Save: $42.06
Trailer Brake Controller
Shipping Weight: 0.65 lbs
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Simple and compact, this proportional brake controller has an intuitive design that's easy to use. Includes a simple digital display, 9 sensitivity settings, a slide-bar manual override, and built-in safety features. Great Prices for the best trailer brake controller from CURT. Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional part number C51140 can be ordered online at or call 1-800-940-8924 for expert service.
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CURT Trailer Brake Controller - C51140

  • Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • Digital Display
  • Under-Dash Box
  • Dash Mount
  • Automatic Leveling
  • Up to 90 Degrees

Simple and compact, this proportional brake controller has an intuitive design that's easy to use. Includes a simple digital display, 9 sensitivity settings, a slide-bar 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
    • 9 Levels of boost let you adjust initial braking power and aggressiveness for smooth, safe braking
    • Slide-bar manual override allows you to control trailer sway or stop in emergencies
  • Dynamic power adjustment intuitively gives you the braking output you need
    • 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 30 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
  • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Automatic leveling lets you mount at various angles
    • 90-Degree vertical mounting range
    • 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 3-1/4" wide x 7/8" tall
  • Mounting range:
    • 90 Degrees vertically
    • 40 Degrees horizontally
  • Limited lifetime warranty

Note: If your vehicle's 7-way trailer connector has LED test lights built into it, the TriFlex brake controller will not be compatible.

Built-In Controls for Adjustable Power

Curt TriFlex Controls and Components

The above diagram shows the controls and components of the Curt TriFlex trailer brake controller.

  1. Digital display
  2. Thumbwheel power output control
  3. Sensitivity adjustment switch
  4. Slide-bar manual override

Output Control

Use the thumbwheel on top of the TriFlex to set 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. You want to go as high as you can without the trailer brakes locking up. To get more power to your brakes, rotate the wheel to the right. To get less power to your brakes, turn it to the left. The output setting will appear on the digital display when you press the brake pedal or activate the manual override. Once you've set up the brake controller the first time, you shouldn't need to adjust this setting unless the trailer load changes, you switch trailers, or road conditions change.

Sensitivity Setting

Once you have the overall power set, you can fine-tune the power output by adjusting the sensitivity of the internal sensor. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. You can adjust this when you're towing heavy loads and you need more umph to bring your trailer to a stop. Your tow vehicle doesn't need that much power to brake in time, but your heavy trailer does. The sensitivity setting gets the braking power to your trailer brakes 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. 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.

There are 9 sensitivity levels (boost levels), with 1 being the least sensitive. Move the switch on the side toward you to increase the boost and away from you to decrease it. When you change the setting, the display on the TriFlex will flash the level before reverting back to showing the power output.

Manual Override

Curt Triflex Manual Override

The Curt TriFlex comes with a built-in, easy-to-reach, slide-bar manual override, great for stopping sway or controlling your trailer's momentum in emergencies. To engage the manual override, just push the slide-bar. 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 when not in use. This feature will turn on after 5 minutes of inactivity and turn off again the moment you press the brake pedal.

Another great way that the TriFlex protects the longevity of your setup is a hold feature that saves wear on your brakes. When you're waiting at a red light, you don't need your trailer brakes on at full power. The longer you sit there, the more they will overheat. But with the TriFlex, any time your tow vehicle and trailer are at a standstill for a prolonged period of time, the controller will reduce the power output to the brakes. This will keep your trailer in place while saving your brakes.

Automatic Leveling and Simple Installation

The self-leveling feature of the TriFlex ensures that the brake controller continues to function even as you drive up steep hills or through the mountains. Simply mount it in your cab at a vertical angle that is within 90 degrees, and the controller will level itself automatically. Make sure that the controller is also positioned so that the side-to-side angle is within ±20 degrees.

Curt Triflex Automatic Leving, Mounting Angle, Simple Installation

Installation is a snap. With its compact design, the TriFlex will fit easily in your cab. 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.

Installation Accessories

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.

Note: If a custom brake control wiring adapter is not available for your vehicle, either a 20-amp or 30-amp circuit breaker (sold separately) may be required for installation.

Proportional Braking

What is proportional Braking

The Curt TriFlex 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 inertia sensor to detect 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.

51140 Curt Tri-Flex Proportional Trailer Brake Control

Installation Details C51140 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional - C51140

Average Customer Rating:  4.7 out of 5 stars   (564 Customer Reviews)

Simple and compact, this proportional brake controller has an intuitive design that's easy to use. Includes a simple digital display, 9 sensitivity settings, a slide-bar manual override, and built-in safety features.


2023 VW Atlas SEL w/factory tow package. I attempted to use my existing Curt Echo BT wireless controller. I was receiving error messages that directionals were nit working. All lights and brakes worked fine. VW had gor a week, found a bliwn fuse snd a bad “brake control module “, but they told me if I had the same issue again, it would be my responsibility. So decided to go the wired route. Install was easy, after I found the trim rivet behind the hood release lever! Need to pop that and driver side kick panel then comes out w/o having to remove hood release lever. Factory harness was hanging inside this panel. Curt VW specific harness (C29JR)plugged into this and Curt controller,no issues. Unit was simple to program, but I haven’t driven trailer yet so will update upon road test! Emily at etrailer was very helpful, I sent her a photo of my VW harness plug and she confirmed the wiring harness was a match


Works well and not a bad install with the etrailer videos, my 97 Dodge Ram Sport 1500 5.2 is a””Wood” truck so I installed the truck flex where the ashtray was, works well



Worked so well I bought another for my Silverado


Had same brand unit prior to this one on an earlier truck. Different trucks and trailers. Both hooked right up to truck wiring and adjusted perfectly to get the trailer stopped without drama. Easy to get the trim just right,good confidence builder.



Like a trusted tool, its a quality item and after installation it just gets used without worrying about it. It gets the job done.


I bought a 7 pin trailer wiring/brake connection for my Dodge pickup. I installed it myself, the instructions were absolutely clear and correct. It was an easy installation. In the year since, I've pulled my trailer (tandem axle, 16') many times. The brakes continue to work perfectly as well as the lights. The connectors are solid, all work just like new. I recommend Etrailer parts and their people 100%!

Howard S.


Still using the products no problems, everything’s works great.


Easy to set up and operate. The controls are less than intuitive. There’s a sensitivity dial and a force level slider that seem to affect the application of the brakes. It’s not exactly clear which one is more important or has the most impact. The unit works well at highway speed but at low speed operations seems to apply the brakes aggressively to the trailer. This is my first experience with a brake controller so can’t compare with other units. It does make parking lot operations somewhat clumsy. It definitely gets the job done though.

Jason J.


Poorly. The tekonsha prodigy is so much better than this unit.


Installed in a 2015 Jeep Grand cherokee. Tow package was already included with the vehicle so installation of the Curt triflex trailer brake controller was very easy. It was simply Plug and Play. Upon plugging in the trailer, the controller did its calibration and was ready to go Within seconds.

The only current issue I'm having is that the turn signals do not appear to be working, however at this time I cannot fault that to the trailer brake controller as the pop-up camper I am connecting is used, and was wired with the seven pin plug by someone other than myself.


The brake controller worked very well on my 2020 ram 1500 classic. My other controller on another vehicle is the count down type which worked fine but this controller works like it is not there (on the same trailer, single axle, 5000 pounds). It arrived on time.
Installation was easy. Make sure to order the adapter cable for your vehicle. Videos for my truck showed removing the center dash piece with the radio/navigation/vents but I could have reached the connector without removing anything if I knew where it was and how it was "hidden". It was buried in the same foam the wiring harness is wrapped in. Sorry, no pics but you can try feeling around and pull out the connector and unwrap the sticky foam. It is a relatively large connector at the end of a 4 inch pigtail off some part of the harness. Mine was curled into itself and the harness so it did not stand out.


Fairly easy to install and set up. I set it up in a 2013 DODGE Durango and pull a 5200# camper with electric brakes. Stopping is very smooth and controlled.

Bill A.


Still like it


Installation was easy with Adapter cable and Controller which I installed on top of dash board cover and required only one hole to be drilled. Installation location allows for easy access to adjust settings, apply the trailer brakes alone and see the display.
Tough part was locating the 2010 Ford F53, Wennibago, Vista, OEM connector which was out of sight. Remove the dash board cover, which was easy, then look for the big harness (see pictures) and the smaller cable which splits away from it. None of the literature explained that the connector is gray for six pins although only for pins are in the connector. Once found, just plug things together and it all works.


I connected the Curt Brake controller into my 2007 Toyota 4runner. It took 5 minutes to hook up using the curt wiring adapter for my vehicle. I pulled a 16' aluminum stock trailer with one horse in it. There were no problems with braking and the braking action was very smooth on the trailer. I also have a weight distribution on the trailer which helps with using the Toyota in an "emergency" tow. The horse had an easy 3 hour tow with smooth braking and no swaying. Thanks etrailer for all the tools that make farm life easier.


2003 Ranger XLT
Installation was fun!
I tend to ignore instructions especially when those instructions mount the device where my knee is constantly banging into that device. See the photo. Would loved to have a longer extension cable to reach into engine compartment. If you are not mechanically and electrically gifted, have somebody that is do the installation.

Had the device not initialize once at the beginning of a trip. After thirty minutes of trouble tracing, decided nothing was wrong, unplugged the cable for a few minutes then reconnected and initialization completed correctly and I had brakes. Now I unplug the device whenever I'm not towing.


Watched one of your installation videos. With the factory wiring harness adapter, that came with the Curt Tri Flex controller, installation was a breeze. It took longer to decide where to mount the controller, than it did to make the electrical connections. Used it with my tent trailer on a 2 day trip, worked perfectly. Very pleased with performance and price. See attached photo of finished installation.


I purchased the trailer brake controller for my 02 Tahoe. Right out of the box it had issues. This controller required a very high setting before it would even work. No less than 7.5 on the screen. Even with all the other settings set to max. The screen also would randomly flash while driving and change the settings. All of my trailers are serviced regularly and brakes start working around 1.5 or so on the other controllers. I have verified all my electrical connections on my vehicle and compared them to another Tahoe, the issue has to be inside the controller. I contacted etrailer about it and they did offer to bench test mine and replace if necessary, but unfortunately I needed to haul trailers almost every single weekend and couldn’t send mine in to wait. The controller has never stopped working which is a plus just very annoying.

Etrailer Expert

Jenny N.


I recommend replacing the controller under warranty.


I have not completed my installation but service is the real topic of discussion. After a rocky start, managment got involved and handled my business which was paramount. Mistakes happen, how they are handled is everything! Good job!


Great controller! Easy to adjust even on the fly. I had the controller adjusted a little aggressive and as I was trying to get out of Buffalo to go south for the winter we ran into some snow accumulation and was able to quickly dial back the controller to avoid locking up on thick snow covered roads. Literally a potential disaster! Very happy with the controller


Wonderful product and product support, I bought a second for my newest truck a 2014 Chevy Silverado LT and the installation was very easy thanks to the videos. I put it where the ash tray would go if they still had them and when closed you cannot see it.


Ordered an in stock item on Sunday. Part wasn’t pulled and shipped until the following Friday. Way too slow for todays options. Won’t shop at etrailer again.


Fortunately my F150 had the trailer package so the pigtail plugged right in. Only snag
was I had to fabricate a piece to attach to the instrument panel (lower right) to get the correct angle they specify. That took some work. But it all came together nicely.
See attached picture. The brake control works great. Good price.


Bought a Kurt TriFlex brake controller. The switch on the side had been broken. So I returned it and received another one. I installed it and my trailer brakes didn’t work. I pulled all four wheels checked all the brakes checked all the wiring spent hours on the trailer found nothing wrong. Then I had to get another controller from the manufacturer as etrailer did not want to send me another. I install that my trailer brakes did not work I inspected everything on my truck and found nothing wrong. I then purchased a prodigy brake controller and everything worked fine I would never buy another curt product in my life


I got home early today from work and found my brake controller waiting for me.(The one thing I did not like seeing was that, although I have a drop box for all parcels next to the fence, it was placed on top of the box. LAZY DELIVERY PERSON! ) Anyway, I took it in and looked it over and decide to do the install. It took longer for me to get the cover off the box where the plug goes,then to do the entire install. Since I didn't want to drill any holes(yet) I used an existing screw down low. Now, I'm just waiting for my son to bring his dump trailer over,which he will leave with me for a few months. Stay tuned,more pictures and review still to come.


Just what I ordered. Was a bit tough finding the vehicle's wiring but after that it was a breeze


Easy to install and set up. I can't believe the difference between this proportional controller and the simpler time delay type. Between the power output adjustment and the sensitivity adjustment, you can quickly and easily adjust the controller for your trailer. It took me about 5 minutes to dial it in perfectly! No more jerky trailer brakes! Thank you E-Trailer!


Yes I received my order and installed the brake controller. All seems to be
fine, although I have yet to tow with it yet. Here are a couple photos of
the installation in my 2010 Toyota Tundra.


after installation, I didn't have to adjust a thing


Worked as desribed,I had no problem installing after watching video.After taking fuse box cover off my wires were hooked up already,no work to do there.For me a straight up easy install that seems to work great.Drove 130 miles after install ,no issues.

Show More Reviews

See what our Experts say about this CURT Trailer Brake Controller

  • How Can Curt Triflex Install in 2015 Volkswagen Touareg
    Installing the Curt Triflex # C51140 is possible in your 2015 Volkswagen Touareg but there are some extra steps for your vehicle and parts you need that you can only get from Volkswagen. If you check out the attached link you can see the overall steps and parts needed.
    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...
  • Curt Triflex Controller Shows Decimal Point and 2.o
    For the Curt Trifles the " . " means that the controller is in standby mode with not trailer connected. "2.0" flashing constantly means that it is in output adjustment mode. Have you tried connecting to a trailer to see if it works or not? You were correct in not wiring the CHMSL wire to the 7-way so it sounds like you may have everything set up properly. You might run through the setup process for the controller that is in the install instructions link I attached to see if it just...
    view full answer...
  • Troubleshooting Brake Controller with OL Code when Brakes are Applied
    If you check out the attached instructions for the Curt TriFlex Trailer Brake Controller # C51140 you can see that the OL code you are getting means that there is an "Overloaded output circuit, trailer brake system fault". Whichever controller you have the problem and solution is the same. You have a short on your brake signal circuit from your brake controller to your trailer brakes which is causing too much power draw. Check both the tow vehicle and trailer connectors and make sure...
    view full answer...
    Image 1 for Image 2 for
  • Curt TriFlex Brake Controller Turns On with Brake Pedal Even If 2013 Kia Sorento is Turned Off
    Yes. Brake controllers such as # C51140 are connected, in part, to the brake switch on the vehicle. When you step on the brake pedal it sends power along the red wire which is input to the controller telling it you are stepping on the brakes. On some vehicles, like yours, the brake lights will light up even if the vehicle is turned off. So it does sound like everything is working properly.
    view full answer...
  • Troubleshooting Brake Controller that Activates Intermittently When Blinkers are Applied
    Sounds like you are using the left turn/stop circuit from your 7-way for the brake switch wire when you installed the Curt Triflex Brake Controller part # C51140. You would want to go back and find the circuit from the brake pedal switch that only see voltage when the brakes are applied and use it and the problem will go away. Since you used the left/turn circuit of your 7-way any time your blinker is used your controller thinks the brakes are being applied for a second and it activates...
    view full answer...
    Image 1 for
  • Is it Normal for 7-Way Tester to Show Voltage on Brake Output Circuit from Brake Controller
    So brake controllers send a small "blip" of voltage on the brake output circuit very frequently to try and detect brake magnets and from there make determination if there is a trailer connected. What you are seeing is normal it sounds like!
    view full answer...
  • Troubleshooting "L" Indicator Code On Curt TriFlex Trailer Brake Controller
    Not to worry, this is a common issue and I will be happy to help you get it working again. The LED light that is showing an "L" on the Curt TriFlex Trailer Brake Controller # C51140 is an indication that the unit has received a power surge. My contact at Curt advised me that in most cases if you will go ahead and unplug the controller, let it sit for a couple of minutes and reinstall it, this process will clear this code out and go back to working as designed. If you still have problems...
    view full answer...
    Image 1 for
  • Curt TriFlex # C51140 Keeps Turning Off and On
    It sounds like there is either a wiring issue or your Curt TriFlex # C51140 has seen better days. Check the grounds for your brake controller as well as the other wires to make sure everything is clean and ready to go. If your TriFlex is randomly losing power then I would spend special close attention to the Black wire from the controller and where it leads out to the battery. Let me know if you are still having an issue and I can help you troubleshoot further.
    view full answer...
  • What Should the Curt Tri-Flex Brake Controller Display On Screen When Not Connected to Trailer
    If your Curt Triflex part # C51140 is constantly flashing something on the display that would indicate there is a problem. It should only display a single dot when a trailer isn't connected and you are driving. If it happens to be flashing a RC code that means you need to unplug the controller and replug it back in as it needs to be recalibrated.
    view full answer...
  • Troubleshooting Curt TriFlex C51140 Having L.b and -- Error Codes
    I would be happy to help you troubleshoot the braking issues you are having with your Curt TriFlex Trailer Brake Controller # C51140. There is not a L.5 error code programed into the controller but there is an L.b which indicates low voltage powering the controller. Then the -- you mentioned means that the battery is not giving enough voltage for the controller to work properly. Since you are getting both of these codes I recommend double checking the black power wire for the # C51140....
    view full answer...
  • Troubleshooting Flashing L.5 Error Code on Curt Triflex Brake Controller
    The L. display should show up on the Curt TriFlex brake controller, # C51140, when it is plugged in. The lever or button on the left side of the controller is the sensitivity adjustment. The L. should change when that lever is moved. You can also try resetting the controller by unplugging it for a few minutes and then plugging it back in (without the trailer connected). We've found that Curt controllers periodically will have odd error codes like this and resetting them takes care of the...
    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, # C51140, on your 2013 Kia Sorento.
    view full answer...
  • Troubleshooting OL Error Code of Curt Brake Controller
    The flashing O.L. message with the Curt Brake Controller part # C51140 when there is no trailer connected indicates that there is a short somewhere on the brake output circuit. I would check all the connections you made on the blue wire from the controller and then also check the trailer connector at the rear of the vehicle looking for any exposed wire or corrosion and fix as necessary.
    view full answer...
  • Troubleshooting Trailer Brakes that are Weak
    Your Triflex controller is a proportional controller which means that with the brake pedal it's only going to apply braking power if it senses deceleration. If you are sitting still when you performed this test (most likely) then the controller won't send a lot of amperage/voltage to the trailer brakes. Most of the time when what you described occurs it's that the brakes need to be adjusted. I have included a link to a video to the right that should help. Fast forward to about the 4 minute...
    view full answer...
  • Troubleshooting Error Code A.E. on Curt TriFlex Trailer Brake Controller C51140
    The operating instructions for the Curt Triflex brake controller # C51140, which are linked for you, indicate on page 19 that if the unit displays the error code A.E. this indicates an internal fault with the controller's accelerometer. This is not a serviceable problem and the unit should be replaced or referred to Curt for warranty service under the terms of the limited lifetime warranty. You may care to review the linked article on brake controllers.
    view full answer...
  • Brake Controller Recommendation for a 2012 Tiffin Allegro QFA34 towing a Master Tow Dolly
    The Curt Triflex part # C51140 that you referenced would do an excellent job as a brake controller in your 2012 Tiffin Allegro QFA34 towing a Master Tow Dolly part # 80THDEB. You'll have to hardwire the brake controller in, which isn't hard. Check out the FAQ article I attached on installing a brake controller from scratch that will detail the installation.
    view full answer...
  • Curt Triflex Brake Controller Troubleshooting Flashing 9.9 All the Time
    The flashing output of a Curt Triflex normally indicates that the brake pedal is pressed but a trailer isn't connected. Since yours is flasing all the time that would indicate that you most likely have a short between the 12 volt power wire for the brake controller and the stoplight switch circuit which is confusing the controller into thinking that the brakes are applied all the time. The solution will be to go over the wiring of the brake controller to find the short and fix as needed.
    view full answer...
    Image 1 for
  • How To Calibrate the Curt TriFlex Trailer Brake Controller
    I have attached an excerpt from the owner's manual on the Curt TriFlex Trailer Brake Controller part # C51140 which shows the setup process including the calibration.
    view full answer...
    Image 1 for
  • Curt TriFlex Brake Control Shows Settings When Not Connected to Trailer or Locks Up Trailer Brakes
    It sounds like the sensitivity is set high. The closer the sensitivity lever is to the driver, the more aggressive the brakes will be. There could also be a short in your vehicle side trailer connector. Check the vehicle and trailer side connectors for any dirt or corrosion inside and out. A short could cause some of these problems and others. Another possible problem is how the controller is mounted. The controller can only be mounted 70 degrees nose up or 20 degrees nose down. The...
    view full answer...
  • How to Disconnect the Curt TriFlex C51140 so it can be Recalibrated
    To disconnect the Curt TriFlex # C51140, you simply need to unplug it. This should be done for 5 to 10 seconds and should get the controller reset. However, if you hardwired the controller and cannot unplug it, you will need to unhook the power wire from the battery. This will have the same affect as unplugging from a port or wiring pigtail.
    view full answer...
  • Troubleshooting Two Lines on Display of Curt TriFlex Brake Controller
    Try unplugging the Curt Triflex part # C51140 for a few seconds and plugging it back in to reset it. If the problem persists the controller most likely has an internal problem and would need to be replaced. On occasion we've seen this issue be a weak power or ground wire connection too so you might check that as well.
    view full answer...
  • Curt TriFlex Trailer Brake Controller # C51140 Installation in a 2012 Volkswagen Toureg
    To install the Curt TriFlex Trailer Brake Controller # C51140 in your 2012 Volkswagen Toureg with a factory 7-way you will just need to connect the four wires from the controller to the wires under the dash of your vehicle. For more information on this check out the FAQ article I attached to the right. Since you aren't installing a Prodigy brake controller you should not have to use a relay or add an additional fuse. If you experience an erratic display with the controller you will need...
    view full answer...
  • Curt Brake Controller Flashes Numbers when Braking and Not Towing with a 2011 Ram 1500
    Curt brake controllers such as # C51140 can be very sensitive and it is not uncommon to get something on the display with no trailer attached. But what I recommend is to make sure the 7-Way connector at the back of the truck is clean and free of corrosion and moisture inside where the wires attach and outside on the pins. Corrosion or moisture can cause a short and cause the brake controller to do strange things.
    view full answer...

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