7 Pin Connector From Truck to Trailer
I have had an issue that happened now on two separate Silverado 2500's. When I would plug the trailer plug into the 7 pin receiver on the truck I would get an error message saying "Check Trailer Wiri...
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I'm on my second GM truck in 2 years. The first, a 2018 1500 sierra did the same thing. Had the 7pin replaced under warranty because it seemed to be full of water after every rain, wash, etc. Still gave the error after replacement so I too hought it was the trailer. It was not.
What I found was this. My theory: For some reason on these new GM trucks, we (I had to any way) have to set up the trailer emergency brake plug FIRST before plugging in the 7pin (needed to be dead power to trailer). Putting power to my trailer first and then connecting the trailer brake was giving me the error. No idea why. But when I set up the trailer e-brake first, power second - Never had another error. Give it a try.
After all that though, it truly could be the trailer. My 2 cents.
What I found was this. My theory: For some reason on these new GM trucks, we (I had to any way) have to set up the trailer emergency brake plug FIRST before plugging in the 7pin (needed to be dead power to trailer). Putting power to my trailer first and then connecting the trailer brake was giving me the error. No idea why. But when I set up the trailer e-brake first, power second - Never had another error. Give it a try.
After all that though, it truly could be the trailer. My 2 cents.
