general problems of the 2017 GMC Sierra 1500 - part 1

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. No warning lights were illuminated. Additionally, the rpm increased quickly. The contact stated that the failure occurred while driving on a busy highway. The contact drove the vehicle across a four-lane highway to get the vehicle to the shoulder of the road. The contact stated that the transmission had seized. The vehicle was towed to an independent mechanic, where the vehicle was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure but provided no assistance. The contact referenced an unknown recall with a similar failure description; however, the VIN was not included. The failure mileage was approximately 128,177.

Driving on highway at 70mph loss of power. Transmision slipping and vehicle rapidly lost speed creating a very hazardous situation. Was able to barley get of highway safely going down to 40mph. Vehicle went into limp mode.

To whom this may concern, this GMC truck with the 6. 2 has had constant engine issues regarding the lifters failure causing the engine to destroy itself internally I’ve had to get it repaired every 3 months on average there’s also a class action lawsuit that applies only to the 2025-2020 years however they are the exact same engine in the 2017. The transmission is not in sync with the motor having a late take off or sounds like the gears are grinding between shifting.

I have 2017 GMC Sierra 1500 6. 2l engine I have maintain my service on this vehicle and now facing a complete engine failure due to the poor design of the engine by GMC. I have spoken with alot people and dealer mechnics and they all agree GMC and chvrolet know that this is a bad design but refuse to acept responsiblity for it. There are tousands of people with this same issue we cant fight this on our own we need your help please.

Original issue started at about 60k miles regarding hard shifts and clunking with acceleration with my 2017 sierra 6 speed transmission. I had it inspected by the dealer when I purchased it, told it was normal for this model. Had it inspected by independent shops, told that this is a known issue, but not fixable without a new transmission. At 90k miles, began experiencing a whining sound while idling. Told it is in the torque converter/transmission housing but I could not afford the thousands of dollars for replacement/inspection. I had the transmission fluid serviced and changed as recommended with the dextran atf that gm recommends in the manual both at 60k miles, and again at 100k miles as recommended. I also drive the vehicle reasonably, yet still at 130k miles had the transmission and converter fail. With no warning, no check engine lights or vehicle codes. Even after I lost 5th and 6th gear, there were no warnings or alert in my truck and despite the transmission giving out while on the highway. I feel this is a huge safety concern with both gm torque converter and transmission issues being known, as well as my vehicle not giving any warnings before, during, or after my transmission failing. I have had the warning lights checked as well, I’m told they are fully functioning when tested, so for some reason there seems to be an inherent issue with the truck’s warning system.

Driving in town going 20mph and the truck shut down not allowing for braking or gas and the steering locked up. Placed the vehicle in neutral, shut the truck off and turned it back. Was able to continue driving. Attempted to have the dealership we bought it from run a diagnostic and the battery was replaced but it continues to shut down at random times. Took the truck to a local auto shop after this happened again, another diagnostic was run, I am waiting the report to confirm what was done.

I had to replace my transmission at 71902 miles. I complained to flow GMC dealership over seven times about the vibration , jerking, shaking and shuddering. Most of the time when I carried they said they can not duplicate the problem. On Feb. 05, 2025 I was driving and stopped at a stop light when I pulled off the vehicle started vibrating, shaking and had a hard jerk. I thought someone had ran in the back of me but that was not the case . I had it pulled in to flow GMC they checked it out and said the transmission need to be replaced. I had it replaced at the dealership. I had to pay $7782 to get a new transmission. I read were they being are all on some GMC models. I want to know why the 2017 GMC has not been recalled.

Transmission went out as I was pulling into traffic, no warning lights on dash and no issues until this incident and had it towed to the dealership where I was told it would be $6600 to replace the transmission and that it was completely in operable. My truck is a 2017 with 53816 actual miles. Called gm company and they will not help with repairs at all.

I have been experiencing trasmission problems. The vehicle jerks, shutters and makes numerous thumping sounds during acceleration as well as at certain constant speeds. It frequently make a lound clunking sound when first put in drive and beginning to move. On January 16, 2025, I took the truck to rubideaux GMC, 351 w dalton Ave, hayden id 83835, for inspection. I was told that the torque converter "was shot" and that the transmission fluid was scorched and there metal shavings in the transmission filter. The service manager informed me that I needed a new transmission at a cost of $7,000. The dealer told me that they will have to find a remanufactured replacement which by their description are in short supply. I went to an independent shop in the area and was quoted a similar price. The employee also advised me of a class action law suite that was in process for 2016-2020 gm trucks and SUV's and passenger cars equipped with the model 8l transmission with the same problem. Several suits are under way including, [xxx] et al v gm, I find this situation especially concerning given the very gentle treatment ive given this vehicle since I purchased it new. The truck only has 63,000 miles on it and I have never towed anything with this vehicle nor carried any load of more than a couple OH hundred pounds in the bed of the truck. What component failed? transmission. The transmission is still in the truck pending available replacement. How was your safety put at risk? the transmission could fail while driving causing a lack of vehicle control. Has the problem been reproduced by a dealer? yes it was confirmed by the dealership listed above. Has vehicle been inspected by the manufacturer, police, or insurance? it has been inspected by a licensed GMC dealer. Where there any warning lamps, messages or other symptons. . . . . ? no information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2017 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. Additionally, the contact stated that the vehicle sputtered. The vehicle was taken to an independent mechanic and diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The contact stated that the failure was a persistent failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 111,000.

Shifting 1st to 2nd and 2nd to 1st is very hard and jolting. It hesitates and doesn't go immediately which could cause an accident.

Vehicle torque converter broke internally at 76000 miles while on the highway, causing vehicle immobile while traveling at 55 mph. Almost rear ended trying to get off highway safely. Torque converter failure caused transmission to have to be rebuilt at a cost of $4,700. After doing some research it is a very common and defective problem with trucks using 6l80 transmission.

Truck would slip out of gear while in drive in very dangerous situations. Tuck would suddenly jerk forward when in drive and stopped at a stop sign or light. No warning light or codes. Transmission specialist evaluated and determined that transmission was about to have a critical failure. The 6l80 transmission was replaced with 109,933 original miles on it.

The automatic transmission occasionally slips and slams hard into gear between first and second gears, causing the truck to lunge forward when attempting to stop. This could potentially cause the truck to hit another person or vehicle when attempting to stop. This problem was immediately observed upon receiving the new truck in 2017 and is ocurring more frequently over time. The problem was reported to and taken in to the GMC dealer. They advised that they were unable to reproduce the problem during their time with the truck. There have been no safety incidents thus far. No warning lamps or messages have been displayed on the dashboard.

8l90 transmission shudders and jolts forward at low speeds. Delayed acceleration when accelerating from a stop.

The transmission isn't working properly and there is a major delay (over one year) in parts because so many are needed.

Transmission making a shuttering feeling while driving. Felt in the steering wheel. Dealer said it’s not covered unless still under powertrain warranty. No check engine light while happening. There was a pending code about transmissions control module.

The contact owns a 2017 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, there was an abnormal sound coming from underneath the vehicle, after which the vehicle lost motive power. The contact was able to continue driving to the destination. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the torque converter. The vehicle was repaired; however, the failure reoccurred 2-months later. The manufacturer was not notified of the failure. The failure mileage was 76,000.

Experienced hard shifting in my transmission a couple before it all of the sudden it made a thing noise and didn’t want to move forward to easy. Babied it home and by then it was whining and whistling all the time. I quit driving it immediately and had it towed. Being only a 2017 I can’t believe this happened. Plus I had a 2014 prior to this and I had the same issue but traded it off before it went all the way out. After going to social media I am finding out that so many people with mid to late model 2000s have had this same issue, even family. Plus I was told by 2 different transmission places this is very common in these with chevy and GMC model trucks. How could this be going on? I am assuming because people don’t know to report. Being on disability and a fixed income this took a hit to my bank account, actually a home equity loan.

The vehicle would shudder when trying to accelerate. I almost was hit by a semi truck trying to merge onto the freeway. Made an appointment with the mechanic then a couple days later I was at a stop sign and the vehicle would not accelerate at all. I placed in park the tried shifting back into drive and still nothing. I had to turn the vehicle on and off twice before I was able to shift it in drive an it actully would accelerate. Even then it would shudder and not accelerate fully. Very dangerous. Just hit 100k miles. GMC certified mechanic said the transmission is shot and needs to be replaced. Cost to replace over $6,000. 00 bought the truck in 2020 for $35,500 and just paid it off.

#1 while merging onto the highway, the vehicle began to shake violently and have a sudden lose of power due to a misfire on cylinder 6 and 4. I was unable to merge onto the highway as the vehicle would not accelerate almost causing me to be hit from behind. I was able to get the vehicle off to the shoulder to avoid an accident as it was barely able to stay running and the cel was flashing. The failed parts (afm lifters/push rods and vlom) have been removed from the engine and saved for review. #2 my family's safety was put at risk as the vehicle had a sudden lose of acceleration while trying to merge on the highway almost causing us to be hit from behind. #3 I spoke with my local GMC dealer and explained the situation and diagnosis that I have completed on the vehicle. That wanted me to pay out of pocket to tow the vehicle in and would not cover anything as the vehicle is barley out of powertrain warranty (72695 miles). I have been an engineer in the automotive industry for almost 10 years and can properly diagnose a vehicle and the issue it has. Trouble codes were provided along with pictures and videos as evidence. I understand when something is a safety issue and needs to be addressed as this is a common issue with gm 5. 3l and 6. 2l engines. I then spoke to gm corporate (mandy, case# 9-12424996557) and once again they wanted me to pay for everything out of pocket even though this is clearly a safety concern with their product and the diagnosis had already been completed. This vehicle has all the maintenance records since it rolled off the showroom floor, proving that the failure is not related to neglect or poor maintenance of the vehicle. There is very clearly a design issue or manufacturing issue on this components. #4 components are available for inspection by mfg. #5 there were not warning lights or any other indicators prior to the failure. Oil pressure was at 40psi and engine temp was ~200f. All within the normal operating windows of the vehicle.

Transmission shifting hard. Shuddering around 60-65 mph.

Truck has always shifted rough, now with only has 102,000 miles has been serviced regularly exclusively at the dealership. It started slipping gears and I was just informed by the dealer that the torque converter detonated and the entire transmission must be replaced.

Transmission temperature sensor has failed. It is available for internal inspection within the transmission pan. Safety has not been in issue, but, apparently it can cause hard shifting when the sensor starts to go bad. You can also easily tell when the sensor is going bad by watching your trans fluid temp needle. It will erratically bounce up and down, sometimes slightly and other times it's big jumps, so you will not be able to tell if the transmission is overheating or running at normal operating temperature. The problem has been confirmed by a local service center. The vehicle/component has not been inspected. There has not been any problems prior to this issue. The check engine light came on 1/24/24 in the evening time. Check engine codes are p0711 & p0700. This is a known issue between 2015-2018 gm vehicle equipped with the 6. 2l & 8-speed transmission. There is/was a special warranty number, #n192291660, that qualifies with the 2016 models.

Transmission has stalled many times from shifting through 1st and 2nd gear going across divided highways and nearly causing accidents, also it has a very bad shudder and hard shifting.

8 speed transmission shudder reported by GMC for my model. My truck has 35,500 miles and has the shudder posted in a technical service bulletin by gm. The supposed fix is x 20 quart fluid flush, new filter, and flash the computer. Gm will not cover under any warranty as they say this is a “fluid change” even though the manual says this fluid should not be changed until 72,000 miles. The dealerships act like they are just hearing about this which is a total lie. They were told over a year ago if they had any new on lot to change the transmission fluid to mobile one synthetic before selling them. This should be a recall as gm knew this was an issue during manufacture. This is a $1200 repair that should be covered by gm.

I was driving my truck home from work, when all the sudden the car at a stop sign lurch forward, with the brake applied and was not moving, or I would have hit the car in front of me. Upon, the green light, truck started to shift and go faster, while making a whining noise, at only 26 miles per hour, then, the vehicle, tried to speed up with nothing engaging, and came to a complete stop very aggressively and abruptly, while in traffic, I almost was hit from the sudden stop. Getting to the side of the road, the truck wouldn’t move anymore, and except in rear gear. Called onstar service and vehicle was towed to the closest gm dealership, about a mile from my house. This was on a Saturday evening, on Monday, the dealer service agent called me, had already diagnosed the problem as a failed 6l80 gm transmission, this was at 930am, asked if I wanted it repaired I said yes. The dealer called back at 3pm that same day and said the transmission had already been repaired. Which to me is a bit surprising as it needed a new transmission, which should take longer. Glad it was fixed so fast. The cost was to be around 6700 dollars. From my knowledge this is a known issue with these transmissions. My concern, is that I could have been in an accident from a known defect in manufacturing that gm knew about and did nothing to address.

My transmission started to shutter then went in and out of gear till it doesn't stay in gear.

My 2017 GMC Sierra 1500 denali started shaking violently and the rpm gage began bouncing 1/4 to 1/2 inch in a very short amount of time. I ran a maintenance facility in europe with 317 local national and 25 u. S. Employees. Two of my brother-in-laws, and one of my nephews are mechanics. Two run their own auto repair facilities. All three reported having to replace torque converters on multiple GMC/Chevrolet 1500 trucks. Many at somewhere between 40 and 60 thousand miles. If this is such a systematic problem, and from tghe number of vehicles they have had to repair it is, why hasn't a recall been issued. Second, in most cases dealerships first charge excessively for replacing the transmission fluid (approximately $900) and then end up replacing the torque converter. The owner has to pay for the transfluid replacement out of pocket because it is condsidered maintenance instead of replacing the torque converter at company expense. . . Especially if you purchased and extended warranty through a third party. If this is recalled, owners should be reimbursed if they had to pay for it themselves and they should be required to replace the transmission fluid filter as a part of the repair,.

In November 2023, my lifters collapsed and I had multiple bent pushrods on my vehicle due to the active fuel management system, leading me to become stalled in my vehicle on the middle of the road with no way of getting off the roadway safely. I have had multiple issues with this vehicle, and know many other who have as well. I had been compliant with all routine and preventative maintenance to this point, and I know that this will lead to injuries or fatalities due to these issues that gm is aware of, yet will not do anything to rectify the situation.

The transmission needed to be replaced car would not go in reverse or foreward at all . It only has 120,000 miles on it .

After 80k miles on a 2017 GMC sierra - my 6 speed at transmission hmd 6l-80 failed. There appears to be know flaws in the GMC transmission, but no recall for my model and year.

The contact’s husband owns a 2017 GMC Sierra 1500. The contact stated that while her husband was driving at approximately 55 mph, the vehicle hesitated and stalled. The check engine warning light was illuminated. The contact’s husband was able to restart the vehicle. The vehicle was taken to the dealer where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was repaired; however, approximately 1 year later the failure recurred. The contact stated that while her husband was driving approximately 55 mph, the vehicle hesitated and stalled. An unknown warning light and the check engine warning light illuminated. The vehicle was towed to the dealer where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was repaired; however, the failure recurred. The contact stated that while driving approximately 45 mph, the vehicle hesitated and stalled. The vehicle was restarted but the vehicle decelerated while the accelerator pedal was depressed. Additionally, the contact stated that she was informed by the dealer that the vehicle failed to shift into the intended gear and as a result, the transmission failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 100,000.

Truck all a sudden developed a lifter noise under the hood and the check engine light came on Friday, September 8th. I checked the oil and oil pressure which was ok. Saturday morning 9/9 I notice some loss of power pulling out on highway. I took the truck immediately to a friend who is a retired gm master mechanic. He coded p0300 and p0306 with 158 miss fires. The following Monday on September 11th I took the truck to clift GMC in adrian, mi. They confirmed a lifter failure and bent push rod on cylinder six. On my 5. 3l engine. Since I have learned the afm system on these engines is driving lifter failures. I was lucky my camshaft was not harmed. My truck had 84,945 miles on it and is six years old. Gm offered no, zero assistance. The dealer could only state this is a well known issue which they see frequently offer a extended power train warranty at a cost of $1600 t $2000 dollars. How is a extended warranty a solution to a poor engine design? help!.

Transmission slipping in and out of gear. Transmission was serviced 5,000 miles previous to this for the 100,000 mile service at 95,000 miles. No issues were found at the time of service, now truck will slip out of gear on highways without warning. Transmission fluid is not dirty or burnt. Common reported issue according to online discussions and GMC needs to recall this model transmission.