Troubleshooting Tekonsha Prodigy P2 Giving Error Code S.H. and o.L.  

Question:

Expert Reply:

The S.H. code showing on your Tekonsha Prodigy P2 # 90885 means that the brake controller is detecting a short on the brake output circuit when you are not braking; when you press the brake it's showing the o.L code which refers to an overload- meaning that you're drawing too much current on that brake output circuit. These two issues are most likely related.

For the first code, SH, the most likely problem is a pinched wire or at some point the wire insulation has cracked or been worn to the point where the copper wire inside is making contact with the trailer frame or another metal part. To find the problem, you will need to start at the trailer connector, making sure it is not corroded, dirty, or damaged, then work your way back to the brake magnets, examining the wire as you go. The fix is to replace the damaged wire and/or clean off the connector.

The second code, OL, could be related to the first. A short between the brake output pin and the ground pin on the 7-Way could cause an overload. Cleaning the connector of any dirt or corrosion would be the first thing to try. If you still have the same problem, sever the connection of the blue wire at the back of the brake controller. Leave enough wire to reconnect the wire after testing.

Once the blue wire is severed, if the brake controller returns to normal function and the decimal point returns on the display, you know that the problem is on the blue wire somewhere between the controller and the connector at the rear of the vehicle. You may need to run a separate 10 gauge wire, # 10-1-1, to the trailer connector to bypass the problem, unless you can locate, isolate, and repair the bad spot in the wire.

Last, the brake magnets themselves could be going bad or gone bad. I would check the magnets for wear before going on to test them with a meter. If the magnets show abnormal wear or if you can see the windings beginning to show through the friction surface of the magnet then they will need to be replaced.

If none of these seem to fix the issue then you would want to test your brake magnets; I've linked a helpful article that explains how to test your brake magnets that I recommend checking out if it gets to that point.

expert reply by: Erik B

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