2500HDAT4

The dealership I went to was phenomenal and took excellent care of me with a loaner. Our vacation was not interrupted at all with their assistance. GM claims that there was a control module issue that is popping up with the 2024 model years. Something with the communication modules disconnecting and then causing issues when things are not updating like they are supposed to. Every module was reset and reconnected to the system overall.

Another JR- Thank you for the feedback. They have checked all the wires and reprogrammed all of the control modules, but I will make sure I question the ground. They are currently tracing all wires in the truck to make sure they are connected to the right points and that there are no shorts between modules. Pryme- I have definitely considered doing just that. I'm also considering using this as the time that I might jump to a diesel engine. 64BAwagon- I will mention the harness connector concern to them. I also have a case open with the GM quality team, and they have been documenting every step of the way, as well as talking to the dealerships with me. We shall see what that result is. Worst case scenario, I push for the lemon law with an attorney.

I have a new 2024 Sierra 2500HD AT4 that I ordered and got in November of 2023. I have not had issues until May of this year, and the engine has started randomly shutting off(more information below). It happens with or without my fifth wheel attached, while stopping at a stop light, and now twice while towing down the highway. I have had it at one dealership that reported they had to reprogram the ECM. Now I took it to a different dealership to have them look into it, because I cannot keep putting my family in a truck that keeps shutting off the engine while towing our 13,000 pound RV. When this happens, the engine shuts down, but all electronic components remain on and I cannot shut anything off or restart the engine. Three of these events have taken 10-15 minutes for all of the electronic components to shut down, and then I am able to restart the engine and everything is running again. I have pushed the onstar button every time that this has happened and had them run a limited diagnostic report related to the truck not being running. It displays an ECM code, TCM code, communication code, and sometimes faulty airbag code. However, once it is running again and they run codes it is all clear. It has happened while running and having the fifth wheel attached and in park, it has happened without the trailer attached when I made it to a stoplight and I sat there waiting for all of this to restart, and then most recently it has happened while pulling the trailer on the highway. When the engine shutdown occurred on the highway, I had no brakes on the truck, but I had trailer brakes to slow me down. I again called onstar and had them run diagnostics. I immediately called my GM dealership where I bought the truck. I cannot praise this dealership enough for how they took care of me and my family! However, I am torn on what to do. Do i trade it for a different one, as everyone seems to not know what is going on? In the state of purchase, the lemon law states that manufacturers have three attempts to fix life threatening issues before it is considered a lemon. I don't know if I want to tempt allowing it to happen again before I pursue other options with regard to familial safety. Has anyone else had this happen? If so, did you get a resolution? The current dealership has had it for a week now, and reportedly been on the phone a couple times with GM engineers that are not sure what is happening. I am torn between letting them try to fix the issue again, or pushing the lemon law aspect and getting another one. I am not willing to risk my family and feel unsafe in a vehicle that is designed to tow and handle what I have it doing.