Factory Brake Controller on 2012 Ram 3500 Will Not Work With EOH Brakes

Updated 02/27/2025 | Published 04/10/2017

Products Featured in This Question

Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional

(6643)

$155.20

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Dodge

(213)

$17.97

Question:

Hi I have a 2012 ram 3500, and I also have my older 2005 ram 3500 with an aftermarket brake controller. Long story short when I hook up my 48foot boat trailer to my 2012, I set my gain to 0.0 and as soon as I hit the brake pedal the intergraded controller goes 10,20,30 instantly and locks up my trailer brakes. My trailer has electric over hydraulic brakes, and I set my dash to light EOH and it still goes 10,20,30 and locks up the tires. I can hook my 03 ram 3500 up and set the controller to 0.0 and hold the brakes and it sends zero voltage back to the brake pump. What could be wrong with the intergraded controller in my 2012? Can I unplug it and install an aftermarket one? The dodge dealer is over a week out and I cant have my truck sit there as i use it for hot shorting across country. Any info is greatly appreciated

asked by: Taylor M

Helpful Expert Reply:

It sounds like your factory brake controller on your 2012 Ram 3500 is at the end of it's life, or that it isn't compatible with an EOH brake configuration even though it is supposed to be.

One other thing you can do to double check, is to set the brake controller at 0.0 and have a buddy depress the brake pedal while you use a Circuit Tester, like part # 40376, to see what the voltage is for the brake controller on the 7-Way at the rear of your Ram. You will want to test the pin in the 5 O'Clock position on your 7-Way. If you are getting 12V then your brake controller definitely needs to be replaced with an aftermarket brake controller.

The brake controller that I recommend for you to use with your Ram is the Tekonsha Prodigy P3 # 90195. This brake controller has an LCD screen which makes it easy to see during operation, plus it is one of the easiest brake controllers to install and operate. You can use the Wiring Adapter # 3021-P to install the P3. This will allow you to simply plug the brake controller into the connector that your factory brake controller is connected to. You might need to take your Ram to a dealer to have them reflash your system so that you don't get any error messages on your truck since the factory brake controller will no longer be connected.

I have attached an installation video of the Prodigy P3 being installed on a 2015 Ram 3500 for you to reference.

expert reply by: Jon G

Suzy D.

2/27/2025

Installed 2 new modules at $300.00 each. This video, some super glue and a few washers or nut and problem solved. Ram will not do anything to help. Watch this video. My late husband was a diesel mechanic and he told sometimes. "The only fix is regular human injunity." He is right. I bought him a 2012 Ram 2500 Laramie edition for his 21 year Army retirement and at 300 miles he stripped the entire exhaust system off, put a race tuner on it and Installed a Lock Pic Air. That was his dream truck. He died in our boat, in our driveway from heart issues from the Afghanistan air. He never saw it coming except he started having chest pains and had his mitral valve needing replaced because of the toxins in the air from burn pits and oil well fires. That was 10 years ago. His truck is 14 years old with 47000 miles on it. I cry alot when I drive it....his military canteen is still in the backseat from him taking it to PT... Sorry for the story but he was a "Diesel God" as his soldiers called him......Have a good one...