2017 GMC SIERRA 1500 Power Train Problems

check engine light and traction control light on. vehicle undriveable. took to dealer code P0304 lifters need to be replaced

After 38,000 miles and 8 years of normal service (mix of city, highway, and 10% towing), my 8L90 transmission began to shudder occasionally. The problem first became apparent when driving slightly uphill, on cruise control at about 50 mph, or while slightly accelerating on a flat road, with no load in the box, and no trailer. It felt like I was driving across a rough patch of asphalt or rumble strips. Every half mile or so, it would shudder. Slowing down or speeding up stopped the rumble. The problem proved not to be caused by tires, U-joints, or AFM. The problem in fact was caused by defective GM transmission fluid, which was sold as "sealed for life", and rated for 200,000 miles, as factory-installed. That proved to be BS. If not repaired, this problem would lead to transmission lockup and/or lack of propulsion, which could contribute to a vehicle crash....

My vehicle has lurched forward upon the first engine start of the day, under no throttle, on several occasions, throughout the life of my vehicle. Shortly after starting my 6.2 engine in my garage, if I shift my 8L90 transmission into Drive as soon as the engine RPMs settle to idle, the vehicle will lurch forward, screeching the tires. Luckily, I had my foot on the brake hard enough such that no one was injured. The harsh transmission shift into drive is dangerous, possible injuring passengers or my garage door. I've learned that if I wait 5 to 10 seconds, allowing the engine to idle (while the transmission oil becomes pressurized ??), then the shift into drive is normal, without any lurch.

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle jerked and slammed into the intended gear. The check engine warning light illuminated. The contact stated that the failure had persisted, and the vehicle had failed to accelerate as intended while depressing the accelerator pedal. The contact stated that the drive was rough, and there was an abnormal rumbling sound coming from the engine. The contact stated that the engine misfired. The vehicle was taken to several unknown locations for diagnostic tests, and it was confirmed that the transmission and the engine had failed. The contact was informed that metal shavings were found in the transmission fluid. The vehicle was not repaired due to the cost.  The contact was provided with the manufacturer's TSB Number: 20-NA-138; however, the vehicle was not covered. The manufacturer was notified of the failure; however,...

Transmission Hard shifts 1-2 or 2-3 Delayed engagement into Drive/Reverse Shudder at 30–60 mph Slipping under light throttle Clunk when stopping The risk I've described to the dealer is that the hard shifts at stop and go in heavy traffic situations could cause and accident. Yes the issue has been confirmed at the dealer and they replaced the transmission. That did not resolve the issue. It has not been inspected. No warnings.

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 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.

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving approximately 55 MPH, the vehicle started losing motive power. The accelerator pedal was depressed and the engine revved; however, the vehicle failed to respond as intended. There was no warning light illuminated. The contact pulled over, and after several attempts, the vehicle restarted. The contact was able to drive the vehicle to a local dealer and failed to exceed 10 MPH. The dealer was able to diagnose the vehicle and determined that the torque converter had failed and needed to be replaced. The vehicle was repaired. Additionally, the contact stated that while driving approximately 35 MPH, the vehicle started vibrating and stalled. The contact stated that again, there were no warning lights. The contact was able to restart the vehicle and drove the vehicle back to the same dealer. The dealer diagnosed the vehicle and determined...

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.

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.

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.

When shifting down to a low gear at an abrupt stop the transmission will hit hard causing vehicle to brake harder and has almost gotten in accidents because it seems to push itself a bit.

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...

The lifters failed on one side and the dealer replaced only that side under warranty. I paid over 64k for this veh and I am scared the other side will fail while driving.

I see you are investigating GM on their 2019 to newer vehicles with the v-8 motors over the active fuel management stuff causing motors to blow, I’ve got a 2017 gmc with 5.3 with 30,000 miles and have issues with it over that mess. Just wondering why vehicles back to 2015 aren’t included in it that have that active fuel management stuff that are having problems? Thanks

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.

Diving my 2017 GMC SIERRA 1500 down the road and all of a sudden it had a big bang in motor,luckily only going 35 miles an hour. Had a slight tick in engine which I had gotten after most recent service visit, and had scheduled to take back to dealer. When I had checked it with a scanner, it only showed a P0700/P0711 code which was for transmission, otherwise no other lights or codes until that day when check engine light came on. Immediately stopped driving and pulled in parking lot and had car towed to dealer that day, [XXX]. They had called me back on [XXX], and said that they had to go further into engine for diagnosis, for extra charges. They called back next day and said that there was a camshaft failure that led to bent rod and metal in engine. Only fix was to replace engine....

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...

The contact owns a 2017 GMC Sierra 1500. While the contact's husband was driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. Additionally, the RPM increased, and the drive signal flashed on and off. The vehicle was driven to the shoulder of the roadway. The vehicle was taken to an independent mechanic where it was diagnosed with transmission control module (TCM) failure. The contact was informed that the transmission control module needed to be replaced. The vehicle was not repaired. The vehicle was towed to the residence. The contact requested a second opinion from another independent mechanic, and it was confirmed as a transmission control module (TCM) failure. The vehicle was not repaired. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage...

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.

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.

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.

My complaint number 11461471 , I made this complaint on 04/20/2022 about my 2017 GMC Sierra 1500.my truck is have the same problems that the GMC trucks recalled. As I stated when I filed my complaint with NHTSA and GMC. I carried my truck back to the dealership 7 times and complained about the problem. Once my warranty expired no one want to talk about the problem with the transmission. I started having problems in September 2017 my truck had 6,949 miles. I have paperwork every time I carried it to gmc dealership. NHTSA need to look at the problem with the 2017 Sierra too.

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 contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle hesitated while accelerating. The vehicle was taken to the local dealer who replaced the spark plugs, but the failure persisted. The contact stated that on another occasion while driving at an undisclosed speed, the vehicle lost motive power and stalled. The vehicle was later towed to the local dealer who determined that the transmission was faulty and needed to be replaced. The transmission was replaced, and the vehicle was repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 110,000.

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle was jerking, and hesitating, and the transmission unexpectedly shifted out of gear while driving. The vehicle was towed to the local mechanic, who diagnosed the vehicle and determined that the torque converter, transmission pump assembly, and reverse clutch were faulty, and needed to be replaced. The vehicle was not yet repaired. The manufacturer and local dealer were notified of the failure, but no assistance was offered. The failure mileage was 50,000. The VIN was not available.

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 contact owns a 2017 GMC Sierra 1500. The contact stated while driving at various speeds, the vehicle hesitated and shuddered upon depression of the accelerator pedal with the check engine warning light illuminated. The vehicle was initially taken to a dealer where the dealer found no defects with the vehicle. The contact was then informed that the shuddering was normal operation. The vehicle was then taken to an independent mechanic and the mechanic discovered a defect with the bell housing. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 29,000.

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

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.

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.

#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...

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.

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...

Transmission shifting hard. Shuddering around 60-65 mph

I purchased the vehicle in November or December 2022. Since then I’ve had problems with my transmission. The torque converter was replaced 2 times, it’s been in the shop 5-6 times and nothing fixed under the warranty when I purchased it. Finally the dealer I purchased from said they won’t take the vehicle back and won’t spend any more money on fixing the truck. Now it has become on my dime to figure it out since I gave up trying to have a shop diagnose and fix it. The last shop said I would have to pay to have the transmission removed and possibly have the valve body replaced since the dealer I purchased it from gave the second shop one chance to get it right. The transmission downshifts hard and clunks since the first day of purchase. Makes a weird wining noise still til this day. I have spoken...

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.

The transmission is shuddering, hard shifting, shuddering and lunging into gear. It is the 6L80 transmission Also has little to no power, took it to the dealership for diagnosis and they say the transmission is bad, torque converter is also bad sending metal throughout the rest of the transmission.

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...

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...

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.

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

THE TRANSMISSION NEEDED TO BE REPLACED CAR WOULD NOT GO IN REVERSE OR FOREWARD AT ALL . IT ONLY HAS 120,000 MILES ON IT .

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 the 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 considered maintenance instead of replacing...

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...