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Troubleshooting P3 Brake Controller that Has Short Error Code at 5 mph  


I read some of the other questions that were asked as far as how to test the brakes. I was hoping you had a simple answer for me before I go through with all that....basically hoping for a quick fix. At low speeds and in reverse the controller is working fine, below 5mph. But when I get over that, the controller starts to alternate between both the Overload warning and the Output Shorted warning when the brakes are applied. When I first installed it, everything seemed to work. This is the first time I have used the trailer and controller with pulling a load since. Have any ideas?


Helpful Expert Reply:

Most likely you have a couple wires wanting to contact each other when the vehicle is moving fast enough to shake the wires which is why the short goes away at a stop but then alternates between the two error codes you mentioned. If the problem only happens when the trailer is connected it's on the trailer's side of the wiring but if all the time it's on the vehicle side and most likely near the controller itself.

expert reply by:
Jameson C

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