2024 Brake controller Problems

[Kyleb100]

9 minutes ago, Rototerrier said:

Well, isn’t that nice. This is my exact issue. I’ve forwarded this to my service advisor and will be picking my truck up this morning. I’ll get my solar disabled on the rv and do some testing today. 
 

Thank you again for sharing. I suspect this is going to help a lot of people out as more of these trucks start hitting the road. Most rvs that will be towed by this size truck will have solar. 

I hope this solves both of our issues until a fix is released. Safe travels

[Rototerrier]

Good news. Disconnected Solar and for the first time ever i didn’t receive a check trailer wiring error when hooking up. Did a 20 mile loop without any issues. Will have to see what happens on my next trip but i think I’m good now. Going to add a disconnect switch for the solar for now. Easy enough. 

Edited July 8, 2023 by Rototerrier

[UWSkier]

Interesting.  I WILL definitely be running my generator while underway on this trip.  There's nothing worse than getting to a 100F campground with a 95F interior trailer temp.  I disconnected my solar.  The WFCO converter provides a max output of 13.6v, 13.2 in float mode which is where I imagine it will stay most of the time with the truck charging it.  The charge pin on the 7 way in tow/haul mode SHOULD have a higher potential than that.  Will let everyone know how it goes!

Edited July 8, 2023 by UWSkier

[MTU Alum]

I believe running generator is going to cause the same problem.  They are working on a fix. 

 

#iworkforGM

[UWSkier]

1 hour ago, MTU Alum said:

I believe running generator is going to cause the same problem.  They are working on a fix. 

 

#iworkforGM

I've been running it for two days and so-far-so good.  Although it seems that the generator surge load when the AC kicks in is much greater with the truck attached than without.  Not sure why that's the case.

 

What happens if I completely sever the 12v link between the trailer and the truck with a switch?  With a generator and/or solar, I don't need the truck 12v to keep the trailer battery charged for the emergency brakes.

 

 

[BuckWallace]

I had this exact same issue on my first trip with my 2024 AT4 3500 SRW L8T. Our trailer was brand new last year and we never had any wiring/brake issues towing it with our last truck (last trip with the old truck was just a month before this). I kept getting the "Check trailer wiring" warning, then would intermittently lose brakes.

 

What ended up "fixing" it was thickening up the trailer plug by wrapping electrical tape around it, then slathering dielectric grease on the connections, which leads me to believe it's at least partly a loose connection issue. The dealer looked at the truck and found no issues. Seeing this solar thing has me wondering, though, since our trailer does have a solar system. I'll try disabling it on our trip next week to see if that helps like some of you are saying.

 

Anyway, a little disheartening since the truck otherwise towed fantastic.

[MTU Alum]

If your trailer battery voltage exceeds the truck voltage, trailer brake power module could set short to ground and disable trailer brakes.  I wouldn't recommend charging your trailer battery while driving with 2024 trucks until a fix is available.

 

#iworkforGM

[gemarsh]

On 7/11/2023 at 7:52 PM, MTU Alum said:

I believe running generator is going to cause the same problem.  They are working on a fix. 

 

#iworkforGM

Wouldn't pulling the fuse for the 7way 12v hot wire cure it for the mean time?

[M3rlin]

UPDATE:  Drove 860 miles with no issue. Used another trailer to move a horse and all heck broke loose when I hooked up to my trailer. Truck spent 3 days in the shop and I was told it was the Hydrastar CAM that GM told our Chevrolet tech to wire to the truck. I’ve been stranded with horses in Tennessee for four days. 

GM is finally listening. Our field rep for GM is hard in this issue. I went and bought a 2022 3500 JUST to tow home. It works just fine so far. I was told NOT to connect the 2024 to the trailer until it’s back at our dealership. Tgakful to have a spare driver with me!
 

*********

My 2024 3500 had similar issues with my LQ horse trailer. It required installation of a Hydrastar Controller Adapter Module 381-7073.  My dealership worked with GM tech to install it ON THE TRUCK instead of the trailer.  This fixes my issue with ANY trailer (hopefully!)

Edited August 3, 2023 by M3rlin
Change in status

[UWSkier]

2000 miles so far with the generator running, solar disabled.  I got the occasional "check trailer wiring" message but the brakes were there the whole time.  Still, awaiting this fix!!!

[brew1986]

I filed a claim with the NHTSA for this. Having brakes disabled because of this is a major safety issue and I had some rough stops with my 5th wheel behind me. I encourage everyone else to do this. The claim number I filed is 11532550.

 

Disconnecting my solar panels did resolve my issue fully for now.

[UWSkier]

It does beg the question how much real world testing actually goes into these things.  Seems absurd they wouldn't have tested extensively with production 5th wheels and travel trailers during the QA cycle.

[64BAwagon]

Agreed, engineering really goofed (the nicest phrase I could think of) on this one. It leans towards a lack of awareness for what the truck would be used for, It reminds me of the lousy gauges on the bottom of the dash. No numbers, just a graph with no indication of an actual value, clearly designed by someone who has never towed. Ford got this area right on their new F350. They have actual data including the current gear on the trans. 

[BuckWallace]

I wired in a breaker between the solar panel and charge controller today to give me the ability to disconnect the solar. We have a trip coming up at the end of the week, so I'll report back on whether that helps. The more of us verifying this the better!

[BuckWallace]

Just made it to our destination and had zero errors/notifications in ~350 miles with the solar shut off. Hopefully GM comes up with a fix soon, but in the meantime it's no big deal shutting off the solar when driving. Glad it's nothing worse than that, at least.