Brake connection warning on 2010 Chevy

Could also be with the brake wire that crosses inside the trailer axles. Sometimes the insulation is rubbed through to the bare wire and you get intermittent failures.

Hope it is on the trailer side or connector...as if in the TV side...potential to be anything/everything in these highly integrated vehicles of today...

From traction control, torque control, emissions control, ABS, automatic controller, ECU, etc, etc...

Am still a fan of P2/P3, as if it is within that, my life time warranty covers (new ones changed to a few years warranty)...or the harness/connector to the trailer.

NOTHING else is tied to the P2/P3 other than the TV's brake light switch sense wire & power sourced from the TV fuse box

I get those too. I clean the TV to TT connection and I'm fine.

ScottG wrote:
Could also be with the brake wire that crosses inside the trailer axles. Sometimes the insulation is rubbed through to the bare wire and you get intermittent failures.

I've had exactly the failure that ScottG discusses above. One thing you could do to check for that failure - which could be on either or both axles - is to grab and move gently the wire inside each axle as a helper is looking at the brake controller display in your truck. The wires in the axles often have a bit of slack, so you can slide them in and out from one side a bit and even twist them a bit. Hopefully if that is an issue your brake controller system will show indication of the failure that you have been seeing. Obviously have the truck ignition system on so that electric systems are operating.

The solution for this problem is just to cut the bad wire at each end, leaving some extra wire at each end, and solder in a jumper wire that you can fasten to the outside of the axles with something like nylon wire ties.

Common problem on GM trucks, usually it says service brake or the message u got. When I get a chance I will try to get a link for u. I saw it on you tube how to fix it. I bought the parts but mine only does it when it rains.... so I think that I have a water intrusion problem on the wiring or the module that I bought to replace.

That's exactly what my '09 started doing.
Then it eventually went into a failure in the ABS system which then cut power to the trailer brakes.

It took over 6months for GM to get the replacement part into dealers.
I had to wire in an aftermarket controller in order to tow because they didn't have the part in the entire country.

When my 08 started having these issues....and they were intermittent on my truck, I said nuts on speding well over a grand to have the modules replaced. I installed a P3 so that no matter what, I have trailer brakes. When it acts up now, I just don't have ABS, but I don't care. The brakes work perfectly otherwise, and I never cared for ABS anyway.

Had that happen on a recent trip. The receptacle that came with the wiring harness that was mounted in the bed had a large socket and allowed the trailer wire to wiggle a little. Replaced it with another that is tighter. I also use a small bungee cord to wrap around it. No issues since.

I had read somewhere that it was a problem with Bargman and they redesigned it.

I had that start happening intermittently on my 2009 Sierra 2500HD then a couple of months ago it would happen every time it started the truck. My independent mechanic traced it to a bad relay that sets in the frame by the spare tire. He said it is in front of the brake control module. He replaced it about six weeks ago and I haven't had any messages or problems with the controller since the..

ScottG wrote:
Could also be with the brake wire that crosses inside the trailer axles. Sometimes the insulation is rubbed through to the bare wire and you get intermittent failures.

Very true; the brake wiring is junk on a lot of trailers.