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What Do the nc and c Message Codes Indicate on a Tekonsha PRIMUS Trailer Brake Controller  

Question:

I need to know what nc and c mean on the display screen.

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Expert Reply:

On the Tekonsha PRIMUS Brake Controller, # TK90160, a message that reads nc means no trailer is connected. A message of c means that a trailer is connected. If you are getting the nc code even if a trailer is connected, it could be caused by one of, or a combination of, several possibilities.

Trailer connected with open circuit on brake line.
Trailer connector disconnected or corroded.
Loss of trailer brake magnet ground.

I have included a link to the installation details for the brake controller that includes a chart of the various codes the PRIMUS can display.

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Michael H
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Instructions for TK90160
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