2024 Chevrolet Silverado 3500

I have issues where I am connected to a new 42" 5th wheel and constantly get "Check Trailer Wiring" warnings as we drive down the road. I have been running with the lights on and they are on and fine, when the warning displays, but lose brakes to the trailer (both through pressing the brakes or controller and the trailer indicator light goes off). I cleaned the ground area and replaced the connector and still see issues. I checked continuity in the cable and good. I have been adding dielectric grease to the 7-pin connector. I saw a YouTube video where another gentleman, with a similar vehicle, had had the same issue and got a recall under GM Service Bulletin 6379278 for a trailer brake controller replacement. When I talked to GM/Chevy Consumer support, they advised that my truck was not under this bulletin and advised to call the NHTSA to get a case open or added to the service bulletin. I have a case open with GM #9-11303425686.

Recently purchased a 2024 Chevrolet Silverado Hd3500 and use it to haul a 40' 5th wheel toyhauler. Several instances when I connected the RV electrical cord to the truck I would see a "check trailer wiring" message. Along with this message I noticed there was no current going to the RV brakes. I had several technicians look into matter, but could not find a resolution. Later my brother sent me a YouTube related to this problem. It appears that if the RV has solar cells for power or the RV generator is running, the voltage on the RV battery is affecting the truck sensors and disables the brakes. This can be a life threatening issue for the vehicle driver or others on the highway.

While traveling with a 5th wheel camper, that has solar panels the brake controller stops providing a connection to the trailer brakes. This is a know problem of the 2024 Chevrolets and so far there is not a fix. This is a big big safety issue. The documentation from Chevrolet states the issue is once the battery charges and has a higher voltage than the truck battery it will surge the system and deactivate the braking system on the camper.

We have a 2022 Grand Design Imagine 22MLE and when we tow it with the truck we are getting the intermittent message on the dash that the trailer brake wiring is not connected. It continually connects and disconnects as we tow and press the brakes on the truck. We previously towed the camper with a 2011 Silverado 1500 and did not have this happen. We took the truck back to the dealer for a service check and they had no answered for us. This is a serious safety concern while we are towing an extra 6,000 pounds behind us.

The truck intermittently disconnects and reconnects from the trailer. Trailer brakes don't work briefly when this happens. At night when truck and trailer lights are on the truck detects trailer is disconnected, this happens every few minutes. Note: I've seen a bulletin about solar panels on the trailer, I do not have solar panels on the trailer. Also, blind spot mirror indicators at night are almost constantly on. When the trailer and truck lights go off, the blind spot indicators work as intended.

Trailer Brake controller DIC shows "check trailer wiring" and Brakes are not functioning. Intermittent issue but mostly no brakes. Lights all work fine. New RV bought in [XXX] testing brakes and DIC indicated issue. Stokes Chevy dealer replaced Brake controller and for 1st 1 1/2 hours on [XXX] no issue. Pulled over for lunch and when restarted truck the issue came back. no brakes or at best intermittent for 700 miles. numerous times pulled over and reconnected 7 pin. using GM recommended 7 pin on RV. Brakes and wires tested by RV dealer. Ford was used to haul trailer initially to RV park and no issues. Took truck to dealer once home ( Cavender GMC) they cannot find issue. Also the check parking brake icon comes on. Heard there is bulletin w/ issue involving solar chargers and batteries on RV being possible issue. RV is 2023 Grand Design 373FB-R. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2024 Chevrolet Silverado 3500. The contact stated while driving 30 MPH towing a trailer and depressing the brake pedal, the trailer failed to slow down as intended. The contact was able to continue driving to the destination. The vehicle was taken to the dealer and the contact was informed that an undisclosed electrical module needed to be added to the vehicle. The vehicle was not repaired. The manufacturer was contacted but no assistance was provided. The failure mileage was 2,800.