While braking ( after being on the highway) all dash gauges turn black, radio shuts off, AC shuts off. Service Stabilitrak light comes on when dash flashes back on. While driving AC turns off, Radio turns off same stabilitrak warning flashes, speedometer turns off. Power steer control went out while trying to turn. Truck put itself in 4 wheel drive when I turned on the trailer assist. Parking assist periodically turns itself off.

- Las Cruces, NM, USA

I have a 2018 GMC Sierra Duramax Quad-Cab and when it is connected to either my boat, stock trailer, or cargo trailer the lights and electric trailer brakes on the trailers do not work. and the chime from the "Service Trailer Brake" indicator sounds and doesn't stop until I unplug my trailer harness from my truck making it a distraction and an unsafe situation when trying to navigate through traffic(changing lanes, stopping, and other functions needed when hauling trailers). The dealership said it was a module and specified which one and so I elected to replace it myself and it wasn't the issue. I choose to do the work myself as they quoted me a price of $700+ to repair the problem.

- Star, ID, USA

Water leak, known in other years of the same model vehicle, caused the rear defrost to fail and smoke when in operation nearly causing a fire in the vehicle as it was being operated.

- Ravensdale, WA, USA

My 2018 GMC Sierra hd experienced an electrical short or overload, causing a thermal event that melted areas around the rear defrost circuit. Lots of smoke and burning smell, but luckily, I did not see flames. The exact issue is currently being addressed under GM recall# "N192265660 rear window defroster thermal events", however my VIN is not included. The issue I had is exactly what is described and I believe should be included in the recall. I've attached a few images of the burned, melted and broken parts. Again, I'm lucky there was only smoke when this happened, and no fire. Please review and advise

- Columbia, MD, USA

While the truck was unattended, smoke was observed by a passer-by who called the local fire department. Fire dept broke a window for access, extinguished fire. Hauled vehicle away for safekeeping. Happened while we were at a condo complex, vehicle parked for the evening. Heat intensity and melted plastic indicated that fire occurred in console area. Vehicle was off, we were asleep, nobody had access to interior of vehicle. A phone charger was plugged in, possibly another charger as well.we contacted GM to file a warranty claim. It was denied, according to yvette young because "GM could not determine the cause of the fire so it is not our problem." GM did three investigations, one by the adjuster, and two more that included a "destructive inspection." This was a two and a half month process. We were notified by phone that the claim was denied and the letter that arrived last week is attached. We don't smoke, did not have anything combustible in or near the area and are concerned that the fire was related to the chargers. Something in that vehicle allowed the chargers to overheat even though the truck was off, in our opinion. Our concern is that if this had been in a garage or had people been in the vehicle, lives could have been lost. Vehicle had 12,000 miles on it.purchased new, no obvious cause for this event. Event occurred at bay point in panama city, Florida.

- Montgomery, AL, USA