Hopkins Trailer Brake Controller Shows E1 Error Only When Vehicle is Started
Question:
When the car is off controller works well once car is started reads trailer not connected
asked by: Ray
Expert Reply:
The E1 error code on the Hopkins brake controller indicates that a trailer is not connected. If the trailer IS connected and you get the E1 code, a probable cause is a dirty trailer connector. Check the trailer connector on the trailer and on the vehicle. Clean out any dirt or corrosion. Corrosion can build up behind the connectors where the wires attach as well.
It is also possible that you have blown the stop light fuse. Check the owner's manual for the location of the stop light fuse and replace it if needed. A blown stop light fuse would cause the brakes not to work with the brake pedal. If the 3rd brake light on the truck is not functioning, it is a sure sign that the fuse is blown. Use a tester like # PTW2993 on the red brake controller wire to make sure it shows a signal when the brake is applied.
You can also examine the trailer brake magnets themselves. If you see the windings coming through, then they need to be replaced. I have included a link to an FAQ article for you on how you can further test the magnets. I have also linked an FAQ article on troubleshooting brake controllers.
