2025 GMC Sierra 3500

weekly you will start the truck and have no audio of any kind. No blinker noises no collision warning noises, no radio, no on star noise. No sound at all and sound will never come back on until you turn truck off and wait 20 mins. GMC says it's a known software issue, but this has been going on since I bought the truck brand new back is April of 2025. I live in a hands free while driving state when it's come to cell phone use and can't even take a call with no audio of any kind. I don't see how GMC can say this isn't a safety issue.

While towing my fifth wheel trailer, the truck intermittently disconnects the trailer brakes while in motion. This results in a sudden loss of roughly 75% of my braking capability, creating an extremely dangerous situation. I have a professional driving background, which has helped me avoid an accident so far, but this issue could easily result in a collision, especially under emergency braking or downhill conditions Service Attempt: On June 17, 2025, I brought the vehicle to Madras Chevrolet in Oregon. The dealership acknowledged the issue but stated the truck is “within GM parameters,” so no repairs were made. They claimed the problem might be with the trailer, but I’ve confirmed the trailer works properly with other tow vehicles. This appears to be a systemic electrical or control issue with the truck. Safety Concern: No vehicle should be allowed to disable trailer brakes while moving. This is a clear design or control system fault. I am concerned that other GMC or GM truck owners may be at similar risk and urge the NHTSA to investigate this problem before it results in serious injury or death. PS. On social media most owners say this is happening to them

I am reporting a potentially serious and widespread safety defect involving Goodyear Wrangler TrailRunner AT tires installed as factory equipment on General Motors trucks. My 2025 GMC Sierra 3500HD Denali has just 5,800 miles. Both rear tires, with DOT code 2724, have developed identical sidewall bulges behind the “NER” in the “TrailRunner” stamp. These bulges are consistent with internal structural failure, not road hazard damage. The truck has never struck a pothole or curb, and there is no evidence of impact or external damage. I have personally inspected several brand-new GM trucks on dealer lots, equipped with the same Goodyear tires, showing the exact same sidewall bulge in the same location. These trucks also have newer DOT Manufacture date stamps. Most importantly, these vehicles have never been driven, which strongly suggests a tire manufacturing defect, not a driver-related issue. At my first scheduled service, the dealer’s service department refused to rotate the tires, citing the bulges as a safety risk. I filed a formal complaint with GM and requested that they involve Goodyear. GM denied the request, claimed the damage was from road impact (without evidence), and stated that the decision was final and not disputable. They refused to conduct any further investigation or escalate the claim. I believe GM’s refusal to act on a potential structural defect, especially one seen across multiple new vehicles, demonstrates a failure to exercise due diligence and exposes the public to unnecessary danger. A blowout from these bulges could lead to serious injury or fatal crashes. I am urging NHTSA to open a defect investigation into Goodyear Wrangler TrailRunner AT tires, particularly those with DOT code 2724 and newer, as installed on GM trucks. I am prepared to submit photographs and dealership documentation as necessary.

Intermittent loss of trailer brake function. While traveling and towing a RV trailer with electric brakes, receive a dashboard alert that trailer brakes have been disconnected. This has occurred since vehicle was new. Trailer brake system has been inspected and trailer is not the issue. Took truck to GMC dealer. They are well aware of common issue with GMC owners. GMC issued a safety bulletin 6+ months ago to dealers to replace the integrated trailer brake controller (RPO code JL1). Per reports that has not solved the issue. My truck did not fall into that safety bulletin. Customer Satisfaction Program number N232414840 says, with the brake issues caused by a potential fault in which voltage feedback occurs. This is a DANGEROUS SAFETY ISSUE.