Chevrolet Silverado 2500HD Trailer Brake Disconnecting 

***UPDATE*** Quick update to this. There is now a fix for this issue. Please see the following video for updated information. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-s-_SfT4teJc.htmlsi=aa7CQ22GHSzxhLiz

You saved me a ton of trouble shooting, thank you for taking the time to share 🙏

I pulled the fuse in space 84 under the hood marked "Trailer Battery" and seemed to have fixed the problem. The trailer battery won't be charged while I'm driving, but I have the solar for that. 2024 Chevrolet 2500 HD LT Duramax 4X4

After some online research I arrived to your video. I am towing a Grand Design Reflection 28RL (with solar) with a 2024 Silverado 2500. Headed out for a camping weekend during Thanksgiving (battery was low + cloudy skies on the way there) the warning did not show up once. However, on the way back (after being plugged in for 3 days, full battery, sunny) the check trailer wiring/brake disconnect/connect message came up around 40 times in a 3 hour drive! I am pretty confident I am having the issue you described in the video. Thank you so much for taking the time to share your experience. Following link to NHTSA and to your other video right after I post this!

Glad that you are at least on the right track in diagnosing your issue. I can only "Imagine" your frustration with GD and GM playing "hot potato" with your and Toni's safety. I did install a solar panel disconnect on our camper, but it is out of warranty so that was not a concern. I'm following along with your saga. Sure hope that someone will step up for you with an actual solution. Safe travels, best to you both. Cheers 🍻

Oh dear ! Sorry you are having such a hard time. It’s very frustrating when it seems like no one is listening to you. Hope everything gets fixed soon

I wonder if putting a blocking diode on the plug cable which would prevent current from trailers solar panel from going to the trailer brake module in the truck. The blocking diode allows current to flow in one direction which in your case is from truck to trailer but not from trailer to truck. Good luck finding a solution. I would trust Grand Design long before I trusted GM. Thanks, RT

***UPDATE*** There was mention that the new software update that Chevrolet pushed would fix this issue. We installed that update prior to a four hour drive day and the results we as follows. We made the first 3 hours of the drive without incident. We stopped at a rest area and I tuned the truck off. When we got back in we had 2 disconnects rather quickly, but then it connected for the remainder of the trip. That's honestly the best performance we have had out of this since we first hauled the trailer back in May. I would be a lot more confident in this situation if we had no disconnects at all, but at this point at least we are moving in the right direction. I'll post another update after out next move. That is supposed to be later this wee, but we may extend where we are so it could be longer.

1 of the wires in the 7 pin connector is a hot wire. It allows the truck to charge the camper battery. Follow that wire from the 7 pin on the camper to the connection point. Probably a fuse or breaker around the tongue area. Disconnect that. If your camper batteries area maintained by solar you really don't need the truck. That should do it.

We had that happen once just after we got on I90 in South Dakota. I did not check before we left ( missed that step). Thank goodness there was a truck stop within 5 miles before we hit any grades. Ours is a Ford. Pulled over and re-plugged and re-started the truck and wala..went away. I hope they get you fixed up soon.

Well, I just found out that FORD is having the same issues with their Intergrated Brake Controller (IBC). I'm wondering if both GM and Ford are supplied by the same vender !

Same issue here, but with our 2023 GMC Yukon (same platform as the Sierra). Just picked up our Imagine XLS Saturday and got that warning every minute or two of the 4 hour drive! 🤷🏼‍♂️ Please update us in your progress, thx!

Just spit balling here but couldn’t you break the break control wire in the trailer harness and install a diode to prevent the DC voltage from the trailer from feeding back to the truck?

I don’t believe the solar panel is the problem. I am having the same issue with my 2024 3500HD in 3 different trailers (dump trailer, equipment trailer and travel trailer). Going to the dealer next week, I’m sure I will get a runaround too. Edited to add that the gain adjustment sometimes doesn’t work either on mine. Not fun when I am hauling a trailer full of gravel and can’t stop properly.

The manufacturer runaround. I wonder what GM has changed in the control modules since our next gen 2019, which does not have this issue pulling a 2022 Grand Design Imagine 2500RL with factory-installed solar? Thank you for sharing. Peace and Safe Travels.

Same problem. 2024 Silverado 2500HD and 2022 GD Imagine XLS 22MLE. Previous truck was a 2018 Silverado 1500 that pulled same trailer for 1 year with no brake connection issues.

Interesting, yes sometimes it can be near impossible to diagnose electrical problems. Hope it works out guys!

Any new updates on your situation? I’m having the same problem on my ‘24 with my trailer brakes disconnecting and came across your video, except my trailer doesn’t have solar. Just 1 lead acid battery. I pulled the fuse on the truck that charges the trailer battery (slot 84 I believe) and the trailer brakes immediately connected. Put the fuse back in and the trailer brakes disconnected again. So I tried towing without the fuse and the brakes never disconnected until I got just about home and hit a bump at which point I got the check trailer wiring message (can’t remember if the brakes disconnected or not though - hope it was just coincidence hitting the bump). I have an appointment with the dealer Monday but I doubt they’ll be able to fix it..

Do you know if this issue is affecting other GM truck models? I have a 2023 GMC Canyon that is doing the very same thing. So I shut my trailer batteries off and it corrected it. Talked to my dealer and they had the deer in the headlight look.

Retired GM service technician here. If it’s back feeding from thr solar panel then disconnect the power feed from the truck to your trailer. You don’t use the truck to charge the batters in thr rv do you since you hav solar? There should be a fuse in your truck. Pull it and try it.

We hope you've found the solution to your problem....but I'm skeptical. There are many, many postings and videos dealing with this issue on GM products for several years. We have a 2019 GMC 1500 towing a 2017 Imagine 2650RK and the ding...ding..ding of the warning is very annoying. Best thing we did was to reduce the volume of the warning bell. It can't be turned off but the annoyance can be reduced.

I have the same issue. I have a 2024 Silverado 2500 and towing a 2021 Grand Design Transcend. I wonder if pulling the battery disconnect would solve the issue. The only problem may be that the 12v refrigerator might not run while towing. Going to try that this weekend.

We have same issue and a Grand Design Imagine 2970rl. We do not have solar. There must be another reason for this issue that is not caused by solar

I know there's a fix for this problem, and this is off topic, but I'm very surprised you don't have a disconnect switch between your solar panels and charge controller!

I have the same issue with my 24 Silverado 2500hd except I'm pulling a 2005 weekend warrior with no solar panel.

My solution to this issue is that I never connect the truck to the RV when the truck is running, nor if the RV is connected to shore power. I have not had any disconnect or gain error messages since.

I just drove most of the way through Mississippi with no trailer brakes. Chevy told me to put a Pollak rv 7 pin. I did and still lose brakes on my 24 2500 HD. I also put a complaint in with nat hwy safety. Trailer that does have a solar panel is currently in shop having a disconnect switch installed. We will see what happens. I also have instigated a lemon law dispute since gm is not having their engineering do crappie until someone gets hurt. Fyi...you don't have trailer brakes when you get that message

We have a 2022 GD Imagine 2800BH and 2024 Silverado 2500HD and talking with a Tech from Furrion/ Lippert he told me to remove the wires from the Mppt charge controller and cap them with wire nuts and or go up on roof and disconnect the solar panel there. We currently at our campground till tomorrow and have an hour drive home. Frustrating!!’

Have you tried to cover the solar panel somehow while traveling with a tarp that’s cut to fit over the panel. This is to keep you from hacking into your trailer or truck until you get an official resolution

We have a 2016 2500HD that has this problem so it's been a long time ongoing problem with these vehicles! I added an in-bed connector, I replaced our trailer harness & connection box, and used electrical grease while also tightening the connector pins. This helped & it happens less frequently, I can even do a whole trip sometimes with out it cutting out. But it can still happen. I thought it was the brakes, but all seemed good there. I will try using the battery cut off switch in the trailer next time to isolate the battery & generator. We have pre-wire for solar but we have no solar panels so it isn't the solar thing for us. But our trailer does have a battery disconnect so I'll try that next time. Thanks.

I have a 2024 3500 gas with the high output alternator as well as aux battery. I have have this same issue with my 2021 Coachmen 298RLS 5th wheel. Been battling it for months. The dealer has replaced the brake controller as well as the brake control module up above the spare tire. I have also installed a Pollak blade style 7-way plug per their request. They keep telling me it's my trailer and likely a bad ground somewhere in the trailer wiring. They have made me drive around with two different testers that simulate a trailer and brake magnets and neither has given an error. This makes GM say that it is my trailer and not the truck. But these testers do not provide voltage back to the module from my understanding. Which wouldn't simulate a true trailer with a battery. I have multiple trailers and this happens even with my 2008 travel trailer with a single battery and no solar. I do NOT have solar or a generator on either trailer. Absolutely dangerous. Once I found the bulletin I decided to try disconnecting my RV battery to prevent any possibilty of back feeding from the trailer battery and test pulling it. I did not get another warning or any issues with the brakes on my test run of 30 miles. Everything seems to work as intended without a battery connected. Seems to have cured the issue. So clearly this happens even without solar or other charging methods. I am looking into witing a one way/diode on the 12v wire to the 7way plug to see if that fixes the issue for the time being. You can't just use your built in battery disconnect as this only stops power from the battery to the coach. The battery still charges from the truck power on the 7 way. I do not want to run around without my battery connected as there is nothing to power the brakes in the event of an emergency breakaway scenario. However, it is safer to drive with properly functioning trailer brakes for now. Just wanted to share my experience to help any others with the same issue.

That sucks! Brand new truck and you have to put up with this sh@&!

My '24 2500HD is doing this, so if solar panels/generator is the problem then why are people like me that don't have "solar" having this issue ? Nothing charging the 'lead acid' battery but the truck. That's a bunch of crap, nothing like pointing fingers !!!

Well gm is telling you to disconnect

Duct tape a tarp over your solar panel on sunny days?

Seem to me like a 🍋..

Why do you think this is a GM problem? It's the charging system on your camper. It's clearly stated on the TSB. It's not GM or any other manufacturer's problem to address an issue you created by connecting by connecting something they have control over to your truck.