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I put aftermarket controller in and worked better. I wish there was a work around to totally redo the wiring from cab to back, at least new harnesses etc. my trucks a bit older and well been salting her for years!
 

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Just had this happen to me on a recent trip from SF Bay Area to Los Angeles area. It was on 12/26 and the trip took 12-1/2 hours, but half way through the trip, I received the Check Trailer Wiring message as well as TSC light coming on. However, I WASN'T pulling any of my trailers.

The TSC light remained on in the dash so I pulled off the freeway I wasn't really moving on and tried to clear it by turning off the ignition and restarting, yet each time, the message and light re-appeared. As I was also travelling with my Wife and dog, my dog started getting restless so I pulled off into a large gravel area left the truck running and let the dog run around and go pee.

When I returned to the truck...warning light was off and message never came back on during the entire rest of the trip. However, I received an email from OnStar explaining that the warning was triggered and to make an appt with my dealer.

Thoughts/comments, should I go to the dealer?
 

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TSC light? What does this mean, in English? Maybe Traction Control System (TCS) ??
 

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Don't go the dealer, yet. Scan your truck for DTC codes. If you don't have a code reader, local parts store will read for you for free. Then react to the DTC that was found.



Lots of posts about TCS system problems on forums like this one and also Youtube. Could be any one of hundreds of problems.
 

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We’re experiencing the same issue. We just purchased a 2015 GMC 2500HD along with a 2007 feather lite trailer. New brakes were installed along with a junction box and a new cable. Our mechanic was trying to save us a little money using a cheaper plug that was somewhat loose in the truck receptacle so we were having connection issues. After installing a better plug we now have brakes, turn signals, brake lights, emergency flashers and running lights We also have “check trailer wiring” notification along with the annoying sounds.
After searching forums this weekend we’re thinking it would be best for us to have an aftermarket controller installed. We looking at the Tekonsha P3. Especially considering all the problems with the factory integrated system.
My question is, will this solve the problem that is happening because the receptacle has the brake and ground at the top, or will that still be a possible problem? Thanks for any responses. John
 

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We also have “check trailer wiring” notification along with the annoying sounds.
I follow problems about the ITBC system pretty closely and have found that when your truck tells you to “check trailer wiring”, that is exactly where the problem is about 90% of the time. And the problem is usually with the trailer wire grounding, or more properly, not grounding, or even shorting. I'd spend a little time checking the trailer's wiring, particularly the electrical brakes, and you'll likely discover the problem.


I used to have a little 21 ft 5th wheel I pulled behind my GMC Sonoma, and lost my brakes in Washington. Stopped in a trailer shop they worked for 4 hours, found the problem, and I'm on my way again. Before I got home, I was in SW Colorado and same problem, and same solution, found problems with the trailer brake wiring. Fixed and I drove home to Kansas. Again I had a problem, same problem, and decided to replace all the trailer brake wiring with 10 ga wiring, and new magnets, and never had a problem again. And you can replace most magnets with stronger magnets that original equipment. One well know problem area is the wire that runs through the center of the axle tube shorting out and the repair is to run the replacement wiring outside the axle with split loom or some kind of additional wiring protection. And make sure your trailer is grounding thru the trailer to truck plug, not thru the hitch.
 

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We’re experiencing the same issue. We just purchased a 2015 GMC 2500HD along with a 2007 feather lite trailer. New brakes were installed along with a junction box and a new cable. Our mechanic was trying to save us a little money using a cheaper plug that was somewhat loose in the truck receptacle so we were having connection issues. After installing a better plug we now have brakes, turn signals, brake lights, emergency flashers and running lights We also have “check trailer wiring” notification along with the annoying sounds.
After searching forums this weekend we’re thinking it would be best for us to have an aftermarket controller installed. We looking at the Tekonsha P3. Especially considering all the problems with the factory integrated system.
My question is, will this solve the problem that is happening because the receptacle has the brake and ground at the top, or will that still be a possible problem? Thanks for any responses. John
I used a P3 on my 2013,,, worked great.. Even though the ITBC was bypassed I still got an occasional brake message in the dash, because the OEM controller was loose in the dash..
 

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Thank you.
I tested the trailer plug ground pin to the metal on the hitch getting good continuity. As I mentioned earlier all systems are working, but we’re still getting the display and dinging. We’re thinking about installing a Tekonsha P3 bypassing the factory controller. Tekonsha says I’ll need to use a blue wire from the P3 back to the 7 pin.
 

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Thank you.
I tested the trailer plug ground pin to the metal on the hitch getting good continuity. As I mentioned earlier all systems are working, but we’re still getting the display and dinging. We’re thinking about installing a Tekonsha P3 bypassing the factory controller. Tekonsha says I’ll need to use a blue wire from the P3 back to the 7 pin.
Correct, run a new power lead from controller to rear harness, or find the power lead under the hood and tap it there...
 

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Correct, run a new power lead from controller to rear harness, or find the power lead under the hood and tap it there...
Again, thank you. I would like to try doing this installation myself. The controller aspect seems pretty straight forward. Could someone advise me where or how to pass the new wire through the firewall? John
 

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So thanks for the replies guy. I hit the original poster up on PM. He linked his problem to the true alter. I went and looked at my trailer today. I popped one tire off and got under the drum and found a broken wire running to my magnet for the emergency brake.
I have the part on order to replace but I’m pretty sure that’s going to be the problem.
I recently hit a curb pretty good in a tight gas steroid parking lot. Must have knocked the wire loose and got it stuck inside the bearing as it rotated. I’m guess it was intermittent If the wires some how made a connection and made it turn off.
Did this fix your problem? Sounds like all other suggestions are hit-or-miss. Having the same issue with 2016 RAM 1500. Thanks in advance.
 
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