Troubleshooting the E2 Error Code on a Hopkins Trailer Brake Controller
Question:
I recently purchased Axletek 7inch brake assemblies and installed them on a pop-up camper we gave to our son, who lives 7 hours away. I tested the brakes with my truck, then with his car that has a Hopkins brake controller, all OK. Now after about 500 miles on the camper he is getting a code, E2 I believe and it indicates a bad magnet. We met at a campground mid-point between us last weekend. I could not pull wheels off there, but did cut the power wire to the right brake and the code went away. Any ideas on this, warranty?
asked by: Robert H
Expert Reply:
I recommend reconnecting the power wire to help with troubleshooting.
The E2 error code on your Hopkins brake controller indicates a short to the brake output wire between the brake controller and the trailer brakes. Check the splice at the brake assemblies. If it came loose or allowed water to get in there, that could cause a short or power interruption. Then, check the brake output wire on the trailer for any possible pinches or cuts. If the wire looks good, look at the brake magnet. If the brake magnet is torn up then I would see if the hub surface is damaged.
If this does not solve the issue, you should check the controller itself to see if there is a problem. Use a circuit tester like # 3808, if needed, to test the blue wire. When stepping on the brake, the blue wire should show power. If it shows power when the brake is not pressed then there is a problem with the internal circuitry of the controller and it will need to be replaced.
If you are still getting an error and it is not a ground or brake controller problem, it is most likely a malfunctioning brake magnet on the trailer. Start by checking the brake magnet wiring. Make sure the ground wires are attached to clean and corrosion free surfaces. Check the power wires to make sure they are not damaged and they are not exposed to the metal trailer frame. If everything turns up clear, check the magnets to make sure they are drawing the correct amount of current. I have included a help article that explains how to do this.
If after you have checked all of these places and you are still getting an error code, let me know and we can troubleshoot further.
