Trailer Brake Control - Proportional

Part Number: 90885
Trailer Brake Control - Proportional
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Product Overview
Prodigy® P2 Electronic Brake Control, for 1 to 4 Axle Trailers, Proportional
The Prodigy P2 electric brake controller supplies power to your tow vehicle's brakes proportionally. This means that your trailer brakes at the same time and with the same strength as your vehicle - even in reverse gear. If you have to slam on your truck's brakes, the trailer's brakes respond instantly, too - there's no delay. Therefore your vehicle's brakes aren't overworked from trying to stop the entire load, and they suffer less wear and tear extending the longevity of your brakes compared to time based controls. The P2 also cuts power to the trailer's brakes when your vehicle is stopped - extending the life of the magnets and brake shoes in the trailer's brake assemblies. Aside from smoother, more efficient braking that results from proportional application of stopping power, the Prodigy P2 also has a boost feature that gives you more initial braking power for those times when you're towing heavier loads. That's when more braking power is needed to stop the trailer at the same time as the tow vehicle. The boost setting sends 13 or 25 percent more power (depending on which setting you choose) back to the trailer brakes, thus compensating for heavier loads. You can boost the power manually at the push of a button as well. The boost feature gets more power to the trailer brakes exactly when you need it most, and your fully loaded rig brakes smoothly and comfortably. This brake controller levels automatically as you drive, so there's no problem using it on steep hills or when towing through the mountains. The self-leveling feature also makes the Prodigy easy to install: Simply mount it in your cab at any vertical angle (it has 360-degree rotation). It's easy to see the display and to access the pivoting manual override lever on the bottom of the unit. The P2's continuous diagnostic check monitors your connection and magnet condition, so you can fix any problems before they land you on the side of the road. This newest version of Tekonsha's popular Prodigy brake controller has reverse battery protection to preserve the unit and accessory systems. And the power-save mode reduces battery drain when the controller isn't in use. The included mounting pocket makes your brake controller portable. Your unit slides out of the pocket mount for easy transfer of the brake controller to another vehicle. After selecting the proper optional (sold separately) harness for your vehicle, one end of the pigtail harness plugs directly into your vehicle, while the other plugs into your P2. Just unplug the unit to move it to another car, truck or SUV use or simple storage - no hard-wiring required. An instructional DVD that is included with the brake controller's written instructions allows you to take full advantage of all the features.
  • Reverse battery protection for both vehicle and breakaway
  • Designed to work with electric over hydraulic brake systems
  • Numerous mounting options - including 360 degree vertical rotation
  • Digital display depicts voltage delivery to trailer during braking
  • No level adjustment necessary - it adjusts itself to varying terrain as you drive
  • Great for backing into tough spots! Works proportionally in reverse with the ability to disable when not needed
  • Produces stops that are in proportion to vehicles deceleration rate
  • "Boost" feature gives users the ability to apply more initial trailer braking power when towing heavier trailers
  • Continual diagnostics check for proper connection, shorted magnet conditions and much more
  • Quick and easy disconnect feature allows user to remove and store the control when not in use
  • Electric trailer brake control for up to 4 braking axles
  • Limited lifetime warranty
Technical Specifications
Brand:Tekonsha
Part Number:90885
Warranty:Limited Lifetime Warranty
UPC:783192026033
Dimensions:4" L x 3.25" W x 10.5" H
(Shipping Dimensions)
Weight:1.5 lbs.
Package Type:Box w/Label
Replacement Parts
PN 7686: Replacement Part - Brake Control Bracket
Part Number 7686
Replacement Part, Prodigy® Mounting Pocket Kit
PN 7894: Replacement Part - Brake Control Wiring
Part Number 7894
Replacement Part, Prodigy®, P3® and Primus™ 3 ft. Pigtail Harness Kit
Frequently Asked Questions

Below is a listing of commonly asked questions and answers for the . If you cant find the information you need here, please submit your question to us using the form in our contact page.

Click on the issue you are having to reveal the solution.

The display shows one dot or the display shows two dots.
The left dot is the power indicator. Meaning that the P2 is powered up and ready. The right dot is the Boost indicator. This tells you that there is a level of boost set.
Do I have to readjust my power settings when I change my trailer load or weight?
Yes, whenever the load or weight changes on the trailer the power settings should be readjusted. Please refer to your Brake Control instructions for proper adjustment. 
Display only goes up to 0.0 to 4.2 when applying brakes.
With Proportional Type digital controls the vehicle must be in motion for the control to have output. If the vehicle is sitting still with the vehicle's brake depressed or stopping very slowly the voltage displayed will be very low on the control. The is normal operation.
The P2 display shows PL.
The P2 detected a power loss on the Black wire. Possible causes:
  • Applied brake pedal or manual lever while connecting P2 to power.
  • Poor connection on Black wire, Fuse or Circuit Breaker.
  • Faulty circuit breaker or Fuse.
The display shows og or OG.
The P2 detects an open ground. Possible causes:
  • Poor or no connection to ground on the White wire of the P2
The display is blank.
The P2 will go into a Sleep Mode after approximately 15 minutes of no movement or input. Possible causes:
  • P2 went into sleep mode.
  • No power on black wire of P2.
  • Bad ground on White wire of P2.
No "C" displayed with trailer connected or shows "nc" with trailer connected.
The P2 has to have a complete circuit on the Blue wire to the trailer brakes and then to ground. Possible causes:
  • Open on brake circuit (Blue wire).
  • Power back feed on brake wire (Blue wire).
  • Trailer has electric over hydraulic brakes and control set for electric brakes.
  • Brake circuit has incorrect resistance on electric brakes.
  • Open on ground of brake circuit.
The display shows "SH".
Possible causes:
  • Short to ground on brake wire (Blue wire).
The display shows "OL".
The P2 detects excessive current on the brake wire (Blue wire). Possible causes:
  • Short to ground on brake wire.
  • Trailer has electric over hydraulic brakes and control is set to electric brake mode.
  • No power on battery charge circuit (for electric over hydraulic brakes only).
What is a Brake Control?
An electric brake control provides power form a towing vehicle to the electric brakes on a trailer. If a trailer has electric brakes, a brake control is needed.
What is the difference between a Timed control and a Proportional control?
Time activated controls apply braking power at a fixed rate of time that is NOT proportional to the pressure applied to the brake pedal. They provide voltage output that increases to the gain setting over a period of time. Proportional controls determine the tow vehicle's rate of deceleration and apply the trailer brakes to match. They provide a smooth braking response in any stopping situation, with no need for adjustments.