2024 CHEVROLET SILVERADO 3500 Electrical System Problems

Email Subject I am reporting a serious safety-related defect involving sudden and complete vehicle shutdown while driving in a 2024 Chevrolet Silverado EV RST. Component/System Involved: The failure appears related to the 12-volt electrical system and associated vehicle control electronics. When the vehicle detects the 12V battery as dead or critically low, it immediately disables propulsion and control systems. The exact failed component is UNKNOWN. The vehicle is available for inspection upon request. Incident Description: This failure has occurred twice under similar conditions (ambient temperature approximately 25°F). On November 28, 2024 and again on January 2, 2026, after driving approximately two blocks at low residential speeds, the vehicle abruptly and completely shut down while in motion. In both incidents, the shutdown was immediate, without warning, and accompanied by a loud thud and an extremely abrupt stop. Safety Risk: In both incidents, the vehicle became completely immobilized in the roadway. I was unable to steer to the side of the road, restart the vehicle, or shift it into gear to move it out of traffic. This created a significant risk of collision. A similar failure at highway speeds could result in a severe or fatal crash. Warnings or Prior Symptoms: No warning lamps, messages, alerts, or other symptoms appeared prior to either shutdown. Problem Confirmation or Reproduction: The issue has occurred twice under cold-weather conditions. Inspections: After the first incident, the 12V battery was inspected and no issues were found. Following the second incident, the vehicle is currently being inspected at a Chevrolet dealership. No police or insurance inspections were performed. This behavior suggests the vehicle lacks a fail-safe or degraded-operation mode for 12V system failure and instead performs an immediate shutdown while in motion, which may represent a serious safety defect warranting investigation.

The contact owns a 2024 Chevrolet Silverado 3500. The contact stated that while driving 30 MPH and attempting to depress the brake pedal, the message “Trailer Brakes Disabled” was displayed. A dealer was contacted. The vehicle was taken to the dealer, and the contact was informed the contact the vehicle was operating as designed, and that neither the vehicle nor the trailer would be diagnosed. The vehicle was not repaired. The manufacturer was notified of the failure and opened a case. The approximate failure mileage was 12,000.

Mileage: 12,000

When driving my truck and towing a trailer which has elec. over hyd. brakes and trying to stop. My truck will disable my brakes on my trailer, which may weigh 3+ times the weight of my truck. GM had a recall on the truck brake module which fixed my problem. Then l took my truck back for an oil change a few months later and they said that there is a open recall on the brake module (NEWER UPDATE) which once again caused my brake issues again with the newer recall. l have opened up a complaint with GM and they say take it to a GM dealer. The dealer checks the truck out and says there is no problem with the truck. They tell me that l need to install a module on my trailer ,which l did early on with the problem. l did own a 2017 chevy and pulled that trailer with NO issues. The trailer dealer hooked the trailer to a 2018 GMC and a 2016 Dodge pick-up. And had NO problem with the trailer brakes and put a NYS inspection sticker on my trailer LAST MONTH. We !! the trailer dealer and myself have spoken to the company ( brake module) that GM says that l need. This trailer brake module which the trailer dealer installed in Feb 2024 still did not fix my problem. The brake module company told me GM has His words a HORNETS NEST problem with this issue. Someone is going to loose there brakes and KILL somebody or a family Thank You for any HELP [XXX] Please contact with any feedback or info 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 that while operating the vehicle, no audible sound was coming from the infotainment center. During the failure, the audible turn signal was inoperable and the warning messages from the infotainment center could not be heard. The contact stated that the OnStar Service would not connect and was inoperable. The vehicle was taken back the dealer to be reprogrammed several times, but the failure persisted. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 100.

Mileage: 100

After replacement of the trailer brake controller for the well known issue of the new OEM trailer brake controller disconnecting from the trailer brakes, the issue still persists. The trailer brake controller should remain connected to the trailer brakes at all times instead of disconnecting under its own control and programming. It is a major safety issue to be trailering a 21,000lb trailer with 6 functional disk brakes and have the controller decide to disconnect at seemingly random times to include descending a mountain pass at highway speeds.

After replacement of the trailer brake controller for the well known issue of the new OEM trailer brake controller disconnecting from the trailer brakes, the issue still persists. The trailer brake controller should remain connected to the trailer brakes at all times instead of disconnecting under its own control and programming. It is a major safety issue to be trailering a 21,000lb trailer with 6 functional disk brakes and have the controller decide to disconnect at seemingly random times to include descending a mountain pass at highway speeds.

The contact owns a 2024 Chevrolet Silverado 3500. The contact stated while driving at an undisclosed speed and towing a camper, upon coming to a complete stop, the message "Brakes Disconnected" was displayed. The vehicle returned to normal functionality, but the failure became a regular occurrence. No other warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure a failure with the brake control module. The vehicle was repaired, but the failure reoccurred. The vehicle was taken back to the dealer, who again diagnosed a failure a failure with the brake control module. The vehicle was repaired, but the failure reoccurred. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 200.

Mileage: 200

While traveling with a 5th wheel camper (Grand Design), 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 that I know of. This is a big big safety issue because the trailer is heavy and hard to stop. 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. This also hold true when the camper battery is too low, again the truck battery will surge the system and deactivate the braking system on the camper.

Consistent error messages when trailering that lead to vehicle having a failure of trailer brakes

The contact owns a 2024 Chevrolet Silverado 3500. The contact stated while driving at an undisclosed speed and towing a trailer, the trailer brake light turned off, indicating that the trailer brakes were no longer functioning. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the brake control module. The vehicle was repaired, but the failure reoccurred. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 500. The VIN was not available.

Mileage: 500

There is an electrical / turn signal and trailering issue. Not towing- the right turn signal gives a rapid flash when the automatic headlights are activated or in off position. The rapid flash goes away when manual headlights are used both running lights and on. Although the light still works with a rapid blink, there is a dash error message and it’s impossible to know while driving if the error is real or not. This issue is intermittent when auto headlights are selected. Towing- bigger safety issue. The trailer lights only work properly when headlights are in auto mode and daylight. When it gets dark, the headlights turn on and error messages happen and trailer lights go out. There are also error messages when manual running lights or manual lights are activated. Thus it appears there is no way to tow an RV safely at night. This did not occur on my 2021 Chevy 3500. These issues are wide spread but GM is doing nothing about it. Please help me, the other owners, and the public from these dangerous vehicles.

I believe my def heater has stopped working and my full def tank is now frozen. I’m now stranded in the middle of South Dakota in -29 degree weather. My truck will not drive. Or idle for the heater to keep me warm because the def is required for engine to run.

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.

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.

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.

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.

Mileage: 2,800