Troubleshooting Trailer Connected/Disconnected Error Messages
Updated 05/27/2026 | Published 05/22/2026
Products Featured in This Question
Question:
My 2025 GMC Sierra 2500 AT4 toggles back and forth between trailer connectedinch and trailer disconnected. I pull a number of different trailers without this same message. This a new to us rv trailer. Both the trailer plug and the female plug on the vehicle have been cleaned with spray contact cleaner. Any idea on how to fix this?
asked by: Landon M
Expert Reply:
Hi Landon,
Does the new trailer you're towing have LED lights on it? LED lights draw very little current compared to incandescent bulbs and newer trucks, especially GM and Ford, use sensitive trailer detection modules that look for specific voltage, resistance, and current to determine that a trailer is connected. LED lights usually don't have enough electrical load for the truck to recognize that the trailer is connected and will flip between "trailer connected" and "trailer disconnected" messages like what you're seeing. There's an easy solution to this thankfully, all you need is a plug-in adapter that helps your truck's computer recognize the trailer's signals. The Curt 7-way Trailer Adapter for Towing Trailers with LED Lights part # C57003 will plug into your existing 7-way to provide a new one that works with trailers with LED lights due to built-in resistors that enable your truck's computer to recognize that a trailer is connected.
What is the new RV that you're towing with your truck?
Mike
5/27/2026
I had the same problem on my 2017 Ford F350. The adapter corrected my problem
Claire H.
5/27/2026
Claire H.
5/27/2026
Product Page this Question was Asked From
7-Way Trailer Adapter for Towing Trailers with LED Lights
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- No Tow Package
- 7 Blade
- Plug and Lead
- Plug-In
- CURT
more information >
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on Custom Fit Vehicle Wiring
Kurt B.
5/27/2026
I was experiencing the same issues with my 2022 Chevy HD. The dealer had no answers, but etrailer did. The 7-way adapter fixed my problem with LED trailer lights. It also fixed the problem with the electric brakes on my LED equipped bass boat trailer locking when backing up.