Update on my issue. I bought a new utility trailer and I was trying to figure out the trailer light issue because I had no trailer brake lights or signal lights just running lights. I bought the trailer brand new and the place I bought it from confirmed it was the truck that was the problem...
same thing happened to me on my 23 PB. "trailer brake system fault" once and a while and then every time I start the truck but then the signal lights inside truck started blinking faster than normal while they still worked normally outside then just lately my check engine light went on. Also...