Started truck for 10-15 minutes with front and rear defrost on to remove ice from glass. Upon entering the truck, there was a smell of wiring/plastic burning. Smoke was coming from the bottom corner of the rear sliding window. I immediately shut off rear defrost and then shut my truck off. Then the driver side rear glass panel popped and shattered completely.

- Breese, IL, USA

Service Trailer Brake System. This has happened in the past 3 Times, in which the local GMC Dealership has made me pay for New Batteries and other Fuel system issues. Dealership stated that this shows up because of a bad battery.

- Albuquerque, NM, USA

Today August 22, 2023 at 2:30pm, just about to leave work home when I received a message on my dash board telling/showing me "Service Trailer Brake System". And that sign kept coming on every second all the way home from work, couldn't heard nothing else that us going on inside the car like my phone, radio, turn sign, etc..

- Forestlake, MN, USA

Infotainment System will change stations, stop navigation / change navigation destination, stop / start playing on its own. Examples of recent issues: 1) While driving from southeastern Ohio to West Lafayette, IN, the navigation system (Apple play through the infotainment system) stopped navigation to entered destination and changed destination to home. This occurred while in Indianapolis and caused us to reroute until we noticed the issue. 2) While playing music from bluetooth, the Infotainment system changed from media play to radio play. The change in volume and music caused me to swerve suddenly while in downtown traffic. 3) The radio changed stations continuously for 5 minutes, changing screens and stations for 5 minutes until I finally shut it off. These are just a couple of the examples. Something happens every time I am in the vehicle, the extent varies. All of these situations cause the driver to lose focus of driving, and also create a shock when first happening. After investigation, I have found that many owners of 2017-2020 GMC vehicles with the Infotainment system have the same issue. Some have fixed the problem by installing new systems (GM offers an "upgraded" system that doesn't have the issue... Coincidence?). This leads me to believe that GM acknowledges there is an issue but will not fix it as a recall. I have video of the latest occurrence, but the site will not allow the file type to be uploaded.

- Washington Court House, OH, USA

1st incident - tried to park turned in and steering went wild stability control light came on & others then truck shut down. 2nd Incident 2 days later- tried to turn off street (with grandkids in car) same thing steering about snapped my wrists off- check engine light came on and others then truck off this was all in a matter of seconds. I turned it on the info system on dash told me to roll down and then roll up window. Husband when driving noticed barking issues - really having to pump brakes (week before) We looked up recalls they are there for both issues for my year make but I have a bigger engine that the recall states so I am not covered yet it is doing all that same stuff for the recall which my husband put it what the truck was doing and found recalls just not for our engine size- THIS TRUCK IS NOT SAFE TO DRIVE AS WHEN YOU TURN IT WILL SHUT OFF IMMEDIATELY. AND YOU LOSE ALL STEERING ETC I AM AFRAID TO DRIVE THIS TRUCK, ESPECIALLY AS WE HAUL OUR GRANDKIDS AND TRAVEL TO IDAHO ON VERY HIGH CURVY ROADS AGAIN NOT SAFE YOUR COMPONETS IT WANTS ME TO CHECK OFF WONLT LET ME CLICK ON ENGINE & AND OTHER

- Maple Valley, WA, USA

Started my truck to go to the store. When me and my son got in we could smell like hot plastic burning. Figured someone was burning trash so we proceeded to the store. About a mile down the road it sounded like someone fired a gun inside the cab of the truck. So being a combat veteran it triggered me! I instantly swung for the back seat thinking someone was back there and noticed the rear sliding window on the drivers side had blown and shattered. I found a recall online that gm had put out about this specific issue happening. So when I called Varney Gmc of Bangor Maine. They told me the recall had Ben done at 97000 miles and there was nothing they could do unless I paid for it-??

- Levant, Me, ME, USA

Trailer Brake System Fault requiring service. Seems like its an issue a lot with Chevy and GMC Trucks.

- Wasilla, AK, USA

Fully enclosed LED tail light (turn and brake integrated into 1 LED "strip") with no visible moisture ingress/egress system showing retained moisture and no longer functional. Dash light for "rear signal brake light failure" appears. This rear light unit is NOT serviceable or repairable when a light goes out and is fully sealed aside from the reverse light (incandescent bulb and functions fine). LED's should have a lifespan that outlives the vehicle and a major incentive to have LED integration with lighting is the lifespan and reduced need for service. Now the taillight and brake light stop working and can not be fixed without spending <$500 per side. This is a safety issue that seems to be closely related to the issues with the GMC Yukon's of the same generation.

- Cortland, NY, USA

Driving down the road. Thankfully it was late at night and the roads were empty. But the truck shut down and brakes locked up and steering wheel locked. Once I was at a full stop. I turned the truck off and back on and was able to drive home. But I called Gmc regarding this issue and brought they couldn-€™t find anything wrong

- Haines City, FL, USA

I purchased my vehicle in January 2022. On 11/18/22 I captured a photo across my dash stating that the trailer brake system needed to be serviced (photo attached). This was the second time this message appeared within days. The vehicle continued to beep and flash for a long period of time clearing out my dash screen making it UNSAFE TO DRIVE. The beeping noise startled me, almost causing an accident on the freeway. I did not know what the warning meant as I wasn't towing a trailer. I wasn't towing anything and could not turn off the beeping sound or the flashing screen, in spite of hitting the dismiss button. I don't know why the message continued to go on and assuming there is an electrical shortage somewhere with the wiring. This needs to be recalled and fixed as it is a manufacturer issue. I do not have any aftermarket parts installed in this vehicle. This same alert message appeared again yesterday 12/5/22 as I was driving back from the airport. It continued for almost 2 hours while on the freeway and again I was not pulling or towing anything. I pulled over, checked my tailgate, turned off the vehicle and turned it back on and the message continued until I got home. It is very alarming and annoying and scared me. This is a big safety hazard and almost caused an accident again as the alert is very loud and flashes across, clearing out your screen, causing you to take your eyes off traffic looking ahead. This time, I was traveling in heavy traffic. Please investigate this further. Thank you

- Salida, CA, USA

The trucks power source starts failing when going at about 15 mph and turning a bit, it happens when coming to a stop or when you-€™re about to park. The steering wheel starts getting super stiff and all the power buttons and lights start going dim and the truck shuts off. The truck can turn on right after but at times it takes about 15 minutes for the system to reboot and then the truck will finally turn. When this happens you can-€™t turn on hazard light making it a dangerous situation at night! I-€™ve talked to other gmc owner with the Denali models and they have stated as well that they-€™ve had the same issue occur at least once to them, this truck currently does it very often and even more in the cold weather! There has been a recall on earlier an earlier year of the same model truck but just not this one making it tedious to try to get it fixed. I-€™ve took it to the mechanic and they-€™ve changed the ground wires, it made the problem just happen less frequently, but it still occurs.

- Austin , TX, USA

As I am driving the truck I notice that as the accelerator is pressed the truck does not respond as it should. I have taken this to a service repair shop and they have stated it is a ongoing issue with these vehicles. So I have taken it upon myself to look online and sure enough OTHERS have also states the same things.

- Tuscaloosa, AL, USA

While making a quick left hand turn at low speed, steering wheel suddenly locked, all lights and electrical went out and engine died. This left me stuck in a busy intersection with no lights. I was able to restart engine after a minute or so. Error message appeared "roll driver side window up, etc." Needless to say, no longer have confidence driving my truck not knowing when this situation may re-occur.

- Anderson Island, WA, USA

The service trailer brake system keeps coming on. The notification constantly alerts and it-€™s distracting my driving.

- Columbia , MS, USA

The contact owns a 2017 GMC Sierra 1500. The contact stated that while the vehicle was turned off, the driver-€™s and passenger-€™s side running boards would erroneously activate and repeatedly extend in and out. The contact was concerned that the failure created a trip and fall, and pinching hazard. The vehicle was taken to the local dealer who was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was also notified of the failure. The failure mileage was 80,000.

- Tinley Park, IL, USA

The contact owns a 2017 GMC Sierra 1500. The contact stated while driving 55 MPH, the vehicle began to shift hard, started shuddering, and lost electrical power. There was no warning light illuminated. The contact was able to push the vehicle to the side of the road with assistance. The contact was able to restart the vehicle however, the vehicle was shifting hard and was shuddering while driving. The vehicle was taken to the local dealer where it was diagnosed that the main power cord had failed and needed to be replaced. The vehicle was repaired; however, the failure persisted. The vehicle was taken to a second dealer; Fresno Buick GMC (5515 N Blackstone Ave, Fresno, CA 93710) where it was diagnosed that the transmission torque converter and the engine mounts needed to be replaced. Additionally, the dealer diagnosed that the coolant reservoir had failed. The vehicle was not repaired. The manufacturer was notified of the failure through email. The failure mileage was approximately 56,000.

- Coarsegold, CA, USA

The trailer brake System sensor keeps going off making the vehicle unbearable to drive. The transmission also jerks when it gets to 7 mph. I've taken the truck to the GMC dealer over 3 times to check the transmission problem and it still jerks. This has been a on going problem since the purchase of the vehicle.

- Mansfield, TX, USA

My complaint is of the intelilink system in this vehicle. While driving the system would change screens, when turned off would turn itself back on. It would hang up on phone calls, would make all these beeping sounds and change stations on radio. It was very distracting and I feel dangerous in that especially at night as I said would not stay turned off so the beeping and changing of the screen that would make the large(8-€) screen go from night mode to day mode and shine into your eyes. When navigating to somewhere system would show that you were in one place, when you were possibly 20 miles from where it would show you to be. Bad because it maybe showing and telling you turn by turn directions and all of a sudden it-€™s gone. This problem has been diagnosed by a dealer and repaired at a cost of $887.85. Was told that it is a very common repair that they do. Have contacted gm customer service and let them know that I thought a 2017 vehicle with 35000 miles should not have this problem and would like some kind of compensation for the problem and repair

- North Port, FL, USA

while driving I get a repeating alarm chime and "Service Trailer Brake System" caution statement on dash panel. This alarm will go off as often as once every three seconds. It is both startling and a hazard to the driver and while towing condition of the trailer brakes is unknown.

- St Louis, MO, USA

Service trailer brakes light pops up and chimes over and over again. I've never pulled a trailer. It's distracting and will randomly go off. Seems to go off when gas is below 1/4 tank. Sometimes it goes months without happening. Sometimes it happens a few days in a row. The dealership says they can't do anything unless they see it go off.

- Anoka, MN, USA