Troubleshooting the e2 Error Code on a Hopkins Reliance Trailer Brake Controller


I have this e2 error code as well, my problem is when the vehicle is moving, if I put my foot on the brake when Im not moving its works correct the numbers step up to to the percentage you preset it to I.e. 50. When I drive and apply the brake it steps up and goes to e2 ...but not every time would that still be a frayed wire? Tryed unplugging the trailer and I get the e1 witch is right just shows that trailer is connected,just cant figure out why it doesnt do it all the time. Thanks for the help


Expert Reply:

The E2 error on your Hopkins brake controller indicates a short to the blue wire. The most likely culprit is a dirty or corroded vehicle/trailer connector and is causing power draw from another circuit to the brake circuit. Clean both connectors and also check the back where the wires attach because corrosion can build up there as well.

If this does not solve the issue, you should test the controller itself to see if it is the problem. Sever the blue wire a few inches from the back of the controller. Use a circuit tester like # 40376 if needed to test the end on the brake controller. Apply the manual override on full. The blue wire should show power. If it shows power at any other time then there is a problem with the internal circuitry of the controller and it will need to be replaced.

If you are still getting the error the next most likely culprit is a malfunctioning brake magnet on the trailer. Start checking by inspecting the brake magnet wiring. Make sure the ground wires are attached to clean and corrosion free bare metal surfaces. Check the power wires to make sure they are not damaged and that there is no exposed wiring touching the metal trailer frame.

You can then visually inspect the magnets for wear. If you can see the windings coming through the magnets will need to be replaced. You can also check the magnets to make sure they are drawing the correct amount of current. I have included a link to an FAQ article that explains how to do this. I recommend using the section titled Testing Individual Brake Magnets.

expert reply by:
Michael H

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