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  1. Trailer Brake Controller
  2. Tekonsha
  3. Electric
  4. Electric over Hydraulic
  5. Proportional Controller
  6. Up to 4 Axles
FITS 2025 Ram 4500
Tekonsha Prodigy P2 Trailer Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional
Tekonsha

Tekonsha Prodigy P2 Trailer Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional

Part Number: TK78HR
In Stock
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$152.36
Trailer Brake Controller
Confirmed to Fit
2025 Ram 4500

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2025 Ram 4500 trailer brake controller from Tekonsha. Product reviews from other 4500 owners. Expert trailer brake controller advice with thousands of helpful questions and answers. Great prices and fastest shipping.
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Tekonsha Trailer Brake Controller - TK78HR

  • Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Up to 4 Axles
  • Tekonsha
  • Under-Dash
  • Plug-In
  • Under-Dash Box
  • Single Trailer Only
  • LED Display

The Tekonsha P2 is a classic brake controller you know you can rely on. It's easy to install, and with the custom harness, it's plug-and-play.


Features:

  • Proportional - Smooth, safe, and good for your brakes long-term
  • Fast installation - Mount the bracket to the dash and then attach the unit to the bracket
  • Plug-and-play - Custom harness included
  • Simple controls - Thumbwheel for gain, button for boost, and manual override lever
  • Easy-to-read screen - Large, simple, and dims automatically
  • Safe - Built-in safeguards protect vehicle, trailer, and controller
  • Quick disconnect - Easy to unplug and remove the controller when you don't need it
  • Automatic leveling - Must be parallel with direction of travel and horizontally level


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
  • Dimensions: 5-1/8" long x 3-1/8" wide x 2" tall
  • Mounting: 360 degrees vertically
  • Warranty:
    • Limited lifetime on brake controller
    • Limited 1-year on wiring harness


Gain Adjustment

Tekonsha Prodigy P2 gain

Gain 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. You want to go as high as you can without the trailer brakes locking up.


You can adjust the gain by turning the thumbwheel on the front of the controller.


Power Boost for Heavy-Duty Towing

The boost setting controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. If your vehicle takes too long to come to a stop, increase the setting. If it stops too abruptly, decrease the setting.


Depending on the level of boost, your trailer brakes can start at either 13 percent or 25 percent of the set gain. So instead of starting at 0, the brakes will start at 25 percent and get to 100 percent sooner. This keeps the trailer from pushing your tow vehicle forward.


Boost Levels:

Approximate Gross Trailer Weight Boost Level Increase in Initial Power Output
Less than tow vehicle GVW B1 13%
Equal to tow vehicle GVW B1 or B2 13% or 25%
Up to 25% more than tow vehicle GVW B2 or B3* 25%
Up to 40% more than tow vehicle GVW B3* 25%

*Both B2 and B3 offer a 25-percent boost in initial power. But the braking curve for B3 is more aggressive than that of B2. This means that, even though you will start out with the same intensity when using these boost levels, you will get an overall more aggressive braking experience with the higher level. So if you use B3, you will reach maximum braking sooner than if you use B2.


Manual Override

To engage the manual override, twist the rotary-style lever from right to left. This will activate the trailer's brakes and brake lights independently of your vehicle, great for stopping sway or controlling your trailer's momentum in an emergency.


Safety Features

The Prodigy P2 offers key safety features to prevent damage to your towing setup:


- Integrated reverse battery protection shields the brake controller and your trailer's breakaway system from shorts.


- When the P2 is not in use, it draws only 3.6 milliamps to minimize the drain on your vehicle's battery.


- Any time your vehicle and trailer are at a standstill with the brakes applied for more than 5 seconds, the hold feature will kick on and reduce power to just 25 percent. This will keep your trailer in place without your brakes overheating.


The Prodigy P2 also runs continuous diagnostics to check for problems as they come up, including:

  • Open ground
  • Overload
  • Output short
  • Power loss
  • No trailer connection

Installing the Tekonsha P2

Installing the P2 is incredibly simple. You'll mount the bracket to your dashboard then mount the unit to the bracket. Plug the custom harness into your vehicle and into the unit. Done!


Keep in mind that the P2 must be horizontally level and parallel with the direction of travel to work correctly.


Prodigy P2 correct mounting

With a replacement wiring harness (sold separately) and replacement bracket (P7685 - sold separately), you can even transfer the Prodigy P2 to another vehicle.


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, 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 Prodigy P2 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.



90885 Tekonsha Prodigy P-2 Proportional Brake Controller - 1 to 4 Axles

Replaces Tekonsha 90185

302400 Tekonsha Brake Control Wiring Adapter with 2 Plugs

Replaces Tekonsha 3024-P

Installation Details TK78HR Installation instructions

California residents: click here


Video of Tekonsha Prodigy P2 Trailer 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 Choosing Between Tekonsha Brake Controllers

When it comes to choosing a brake controller, a lot of them are gonna look very much the same. And two of them that I really like are from Tekonsha. We have the Prodigy P2 and the Prodigy P3. So, they look very similar, but they do have quite a few differences and we're hoping to break that down, that way you can decide which one's best for you. Here we have our P3 installed and really it comes down to it has more bells and whistles than the P2, otherwise it's pretty much the same controller. The P3 does have a nicer/easier to use display.

It's a little bit more user friendly. It uses some icons here that, you know, show you a trailer and that way you know pretty quickly what boost level you're at and it's really easy to read. It's a nice digital display and you can change a lot of that. Also, it has a little bit more diagnostics. So as far as, instead of just having error code with the P2, this one will actually tell you exactly what it is and there's a host of diagnostics so that way you can look at it.

You won't have to troubleshoot the code by looking at the owner's manual. It'll tell you right away what's happening. The P3 is also really nice if you have a bunch of trailers in your fleet, you can set up presets, up to five of 'em, and that way when you hook up to said trailer, you can select that and it's gonna be preset to the boost settings and also the gain that you may have dialed in. That way you just hook up and you'll be ready to go. Multiple trailer settings are gonna be nice, especially if you have a work truck and you're hooking up to a bunch of different trailers, you can get that dialed in, but if you tow the same trailer over and over, or you know that you're only gonna have one trailer long term or maybe two, that's really not gonna be a function that is necessary.

Now with the P2 installed, you can see right away that the display is obviously not as fancy as the P3, but you again have all the same functionality. There are less buttons, so that kind of keeps it simple. If you just need a brake controller, this is a great option. You still have your power knob, you have your boost button, and you still have essentially the same manual override, which I do like on the Tekonshas, you have a nice modulation here. But really when it boils down to it, they are very, very similar.

The size is gonna be almost identical. They're gonna mount up the same, they're gonna install the same. Again, you have that same proportional here. They both work for one to four axles. They're both proportional. So pretty much the same thing, just more bells and whistles on the P3. If it's something that you're gonna wanna keep for a long time on your vehicle, a P3 is pretty sharp. I do like the display, and something to think about too, you can always take a brake controller from one vehicle to the next, so, but if you're just need to tow a trailer and you need a brake controller, P2 you're not gonna go wrong with. I just like the fact that there is diagnostics that are a little bit more straightforward with the P3. And if you're worried about if it's gonna work with your trailer, they're both gonna work with the same kinds of trailers. You can have electric brakes, you can have hydraulic brakes, it doesn't matter. These are gonna work with either one. So hopefully this video helps break down some of the similarities and differences to help you decide which Tekonsha Prodigy Brake Controller is gonna be best for your needs.

Customer Satisfaction Score:

Ratings & Reviews

4.9

2749 reviews
The Tekonsha P2 is a classic brake controller you know you can rely on. It's easy to install, and with the custom harness, it's plug-and-play.

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  • Recommended Trailer Brake Controller for a 1996 Ford F-150
    In order to install a 7-way trailer connector on the rear of your 1996 Ford F-150 you would want to use the Adapter 4-Pole to 7-Pole and 4-Pole part # 37185. The adapter uses the existing 4-way harness and converts this to a 4 and 7-way trailer connector. I have attached a video that will show you exactly how to install this harness on a similar 1999 Ford F-250 for you. Once you have the 7-way trailer connector wired properly, I recommend taking a look at the Tekonsha Voyager Trailer Brake...
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  • Which Install Harness for Primus IQ Brake Controller and 2019 Ram 1500 Classic
    Hey George, we used to carry replacement brackets for the Primus IQ with the part # 6927 and # 5280 but we stopped being able to get it from the manufacturer. The correct harness for the Primus to install in your 2019 Ram Classic 1500 is the part # 3024-P.
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  • Availability of Custom Wiring Harness for Brake Controller Installation on 2023 Winnebago Solis 59P
    It sounds like you're looking for a custom wiring harness like the # 3024-P to install a brake controller in your 2023 Winnebago Solis 59P. Even with the factory 7-way they did not add a plug and play connector on the Promaster 2500. The only option would be to find the correct wires and splice them in. If you don't want to try to figure out where the correct wires are located you could always use a brake controller like the Curt Echo # C51180 which plugs into your 7-way at the rear.
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  • Tekonsha Brake Controller Adapter for a 2025 Ram 1500
    Hey Ken, thanks for reaching out! The correct part you need is the Tekonsha Plug-In Wiring Adapter # 3024-P for your 2025 Ram 1500. This is a pretty new fit listing which is why you're having trouble finding a confirmation on what you need.
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  • Which Plug In Wiring Adapter Is Needed To Install Tekonsha Prodigy P3 90195 In 2021 Ram 1500?
    The correct plug-in wiring adapter to install the Tekonsha Prodigy P3 # 90195 in your 2021 Ram 1500 is the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Ram # 3024-P which will plug into the factory trailer brake controller port located under the dash of your Ram. I included videos for both of the products mentioned for you to take a look at.
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  • Why Install an Aftermarket Brake Controller on a Truck with a Factory Controller
    In the video you're referring to of the 2015 Ram 3500 we installed the Prodigy P3, part # 90195, simply because the customer wanted one. He wasn't happy with the performance of the factory integrated brake controller on his truck and he had previously used a P3 that he was happy with so he decided to install a P3 in this truck. We do periodically see people who wish to install aftermarket controllers on trucks with factory controllers, although it's usually on older models than this one...
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  • Determining Factory Wire Color Functions for Brake Controller Port on 2016 Ram 3500
    The easiest way to install your Tekonsha Prodigy P3 # 90195 is to use the Tekonsha Plug-In Wiring Adapter # 3024-P. This adapter will not require and cutting or splicing into your 2016 Ram 3500's factory wiring. If you need to hardwire install the controller, I can help you determine which wire colors carry which functions on the vehicle side brake controller installation port in your 2016 Ram 3500. Since we know which pins carry each function on the custom wiring harness # 3024-P, we...
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  • Does ECU on 2022 Ram 1500 Need to Be Re-Flashed to Install a Brake Controller
    If you're simply wanting to install an aftermarket brake controller on a 2022 Ram 1500 that isn't equipped with the OEM brake controller, you will NOT need to re-flash the ECU. If that's what you're trying to do, the # 3024-P harness you'd looked at would allow you to install a Tekonsha or Draw-Tite brake controller like the # TK90160 Primus brake controller. Simply plug the # 3024-P harness into the connector under the dash, plug the controller into the harness and you'll be good to go. If...
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  • Recommended Disc Brake Conversion Kit for 5200-lbs Lippert Axles with 6 on 5-1/2 Bolt Pattern
    I was able to check with Lippert to get confirmation on the specs of your V000408984 axle, which are 5200-lbs axles with 6 on 5-1/2" bolt pattern hubs. This will give you 2 different options you can use depending on the quality of corrosion resistance you're looking for. The first option is the Kodiak Disc Brake Kit # K2HR526D, which is a confirmed fit with the hubs and spindle that came on the V000408984 axle. This disc brake kit is dacromet plated to provide you with good corrosion...
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  • How Easy is it To Replace the Factory Brake Controller on a 2016 Ram 2500?
    Hey Brent! No, the factory brake controller on your 2016 Ram 2500 is pretty easy to swap out with one like the Tekonsha Prodigy P2 item # 90885. You'll need to remove the dash panel around your factory controller, pull the unit out of the dash, and unplug the connector from the rear, as shown in the picture below. You'll want to purchase the Tekonsha Prodigy P2 Trailer Brake Controller w/ Custom Harness item # TK78HR though. This kit comes with a plug and play adapter that inserts directly...
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  • Wiring Harness for Prodigy P2 on 2020 Ram 1500 SLT Without Factory Brake Controller
    Hi Stephen; even without the factory brake controller you should have the brake controller port under your dash. The Tekonsha Prodigy P2 Trailer Brake Controller # TK78HR you were looking at comes with the custom wiring harness for installation so that is everything you need. This brake controller is incredibly reliable and will work well with your tandem axle horse trailer.
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Info for this part was:

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

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