What Does the SH Error Message Mean on a Tekonsha PRIMUS IQ Trailer Brake Controller

Question:

I get the code 5h on my break indicator, everything was working fine for 2weeks then all sudden the breaks on the trailor stoped working and the code 5h displays it self on the inductor box we have in the truck. I have no clue Any help would be much appeticated

asked by: Brandon

Expert Reply:

On the Tekonsha Primus, # TK90160, the SH error message means that the brake controller is sensing a short on the brake wire (blue) when at idle. The instructions I have linked also state that some test lights and non-Tekonsha testers can cause this problem.

The most likely cause is a dirty or corroded trailer connector. Inspect the truck and trailer side connectors for dirt and corrosion. Also check where the wires attach to the back of the connectors. On the trailer check the main ground and brake magnet grounds to make sure they are attached to clean and corrosion free bare metal surfaces. Make sure there are no nicks in the wiring touching bare metal on the trailer.

You can also test the magnets by following the FAQ I have linked for you.

expert reply by: Michael H