Troubleshooting No Trailer Connection Error 2013 Ford F-150
Updated 12/22/2025 | Published 10/14/2024
Question:
I have a 2013 F150 5.0 when connecting my trailer lights either using an adapter or just plugging the four prong in it still says trailer disconnected although I have turned signals brakes flashers but no running lights. Any suggestions?
asked by: Matt W
Expert Reply:
Hey Matt, most of the time this is due to some corrosion on the pins of the connectors. I would try taking some sandpaper to all of the pins and also make sure there's no bent or damaged pins.
Here's some info I found from Ford on the error code though:
TRAILER DISCONNECTED — This message is displayed and accompanied by a single chime when a correct trailer connection was made and then a disconnection has been sensed during a given ignition cycle. This message is also displayed if any of the following occur:
the 7-pin trailer connector becomes disconnected while driving
an intermittent open circuit occurs in the vehicle wiring from the TBC module to the 7-pin trailer connector or the trailer wiring
during manual activation using the manual control lever without a trailer connected (accompanied by a single chime)
Product Page this Question was Asked From
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Jameson C.
12/22/2025
Hey Matt, did cleaning the connector pins help clear the “trailer disconnected” message on your F150? Your update could make it easier for others dealing with the same trailer light issue.