Troubleshooting LED Trailer Taillight Error Code on 2021 Ford F-150

Updated 02/06/2025 | Published 02/04/2025

Question:

I have a utility trailer that i was having problems with the led tailights. 2021 F 150 with a trailer light and brake wiring fault on the dash. If i unplugged the taillights the fault codes goes away. Put standard tailights on it and the codes went away. Why did the leds trigger the fault code?

asked by: Rick M

Expert Reply:

Hey Rick, the problem is that the trailer taillights are somewhat connected to your truck's taillights and since LED taillights draw a fraction of the amperage as an incandescent it will make the truck think it has a bulb out. So what you can do in these situations is use the 7-way adapter part # 20142 and the error issues would go away.

expert reply by: Jameson C