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Red is Trailer disconnect or Brake malfunction.
30 ft is the BSM trailer length detected
1st check is your trailer umbilical, if 7-pin it MUST be the new style.
2nd probability is you have a short or open in your trailer brake wiring or a bad magnet if electric drum (most likely type).
This post is about the brake controller on the 2021 HD Ram. First, my story. Second some reverse engineering and description of the warnings on the dash. Finally, some technical details. I would assume this information would apply to other years in the same generation of truck, but outside of...
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